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573 lines
18 KiB
Python
573 lines
18 KiB
Python
"""
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Printing tools.
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"""
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from __future__ import annotations
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from collections.abc import (
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Iterable,
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Mapping,
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Sequence,
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)
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import sys
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from typing import (
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Any,
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Callable,
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TypeVar,
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Union,
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)
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from unicodedata import east_asian_width
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from pandas._config import get_option
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from pandas.core.dtypes.inference import is_sequence
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from pandas.io.formats.console import get_console_size
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EscapeChars = Union[Mapping[str, str], Iterable[str]]
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_KT = TypeVar("_KT")
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_VT = TypeVar("_VT")
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def adjoin(space: int, *lists: list[str], **kwargs) -> str:
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"""
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Glues together two sets of strings using the amount of space requested.
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The idea is to prettify.
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----------
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space : int
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number of spaces for padding
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lists : str
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list of str which being joined
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strlen : callable
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function used to calculate the length of each str. Needed for unicode
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handling.
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justfunc : callable
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function used to justify str. Needed for unicode handling.
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"""
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strlen = kwargs.pop("strlen", len)
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justfunc = kwargs.pop("justfunc", _adj_justify)
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newLists = []
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lengths = [max(map(strlen, x)) + space for x in lists[:-1]]
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# not the last one
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lengths.append(max(map(len, lists[-1])))
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maxLen = max(map(len, lists))
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for i, lst in enumerate(lists):
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nl = justfunc(lst, lengths[i], mode="left")
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nl = ([" " * lengths[i]] * (maxLen - len(lst))) + nl
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newLists.append(nl)
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toJoin = zip(*newLists)
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return "\n".join("".join(lines) for lines in toJoin)
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def _adj_justify(texts: Iterable[str], max_len: int, mode: str = "right") -> list[str]:
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"""
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Perform ljust, center, rjust against string or list-like
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"""
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if mode == "left":
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return [x.ljust(max_len) for x in texts]
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elif mode == "center":
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return [x.center(max_len) for x in texts]
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else:
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return [x.rjust(max_len) for x in texts]
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# Unicode consolidation
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# ---------------------
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#
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# pprinting utility functions for generating Unicode text or
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# bytes(3.x)/str(2.x) representations of objects.
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# Try to use these as much as possible rather than rolling your own.
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#
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# When to use
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# -----------
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#
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# 1) If you're writing code internal to pandas (no I/O directly involved),
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# use pprint_thing().
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#
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# It will always return unicode text which can handled by other
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# parts of the package without breakage.
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#
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# 2) if you need to write something out to file, use
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# pprint_thing_encoded(encoding).
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#
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# If no encoding is specified, it defaults to utf-8. Since encoding pure
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# ascii with utf-8 is a no-op you can safely use the default utf-8 if you're
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# working with straight ascii.
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def _pprint_seq(
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seq: Sequence, _nest_lvl: int = 0, max_seq_items: int | None = None, **kwds
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) -> str:
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"""
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internal. pprinter for iterables. you should probably use pprint_thing()
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rather than calling this directly.
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bounds length of printed sequence, depending on options
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"""
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if isinstance(seq, set):
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fmt = "{{{body}}}"
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else:
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fmt = "[{body}]" if hasattr(seq, "__setitem__") else "({body})"
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if max_seq_items is False:
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nitems = len(seq)
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else:
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nitems = max_seq_items or get_option("max_seq_items") or len(seq)
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s = iter(seq)
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# handle sets, no slicing
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r = [
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pprint_thing(next(s), _nest_lvl + 1, max_seq_items=max_seq_items, **kwds)
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for i in range(min(nitems, len(seq)))
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]
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body = ", ".join(r)
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if nitems < len(seq):
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body += ", ..."
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elif isinstance(seq, tuple) and len(seq) == 1:
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body += ","
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return fmt.format(body=body)
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def _pprint_dict(
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seq: Mapping, _nest_lvl: int = 0, max_seq_items: int | None = None, **kwds
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) -> str:
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"""
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internal. pprinter for iterables. you should probably use pprint_thing()
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rather than calling this directly.
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"""
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fmt = "{{{things}}}"
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pairs = []
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pfmt = "{key}: {val}"
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if max_seq_items is False:
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nitems = len(seq)
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else:
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nitems = max_seq_items or get_option("max_seq_items") or len(seq)
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for k, v in list(seq.items())[:nitems]:
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pairs.append(
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pfmt.format(
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key=pprint_thing(k, _nest_lvl + 1, max_seq_items=max_seq_items, **kwds),
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val=pprint_thing(v, _nest_lvl + 1, max_seq_items=max_seq_items, **kwds),
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)
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)
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if nitems < len(seq):
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return fmt.format(things=", ".join(pairs) + ", ...")
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else:
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return fmt.format(things=", ".join(pairs))
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def pprint_thing(
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thing: Any,
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_nest_lvl: int = 0,
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escape_chars: EscapeChars | None = None,
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default_escapes: bool = False,
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quote_strings: bool = False,
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max_seq_items: int | None = None,
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) -> str:
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"""
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This function is the sanctioned way of converting objects
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to a string representation and properly handles nested sequences.
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Parameters
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----------
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thing : anything to be formatted
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_nest_lvl : internal use only. pprint_thing() is mutually-recursive
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with pprint_sequence, this argument is used to keep track of the
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current nesting level, and limit it.
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escape_chars : list or dict, optional
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Characters to escape. If a dict is passed the values are the
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replacements
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default_escapes : bool, default False
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Whether the input escape characters replaces or adds to the defaults
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max_seq_items : int or None, default None
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Pass through to other pretty printers to limit sequence printing
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Returns
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-------
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str
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"""
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def as_escaped_string(
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thing: Any, escape_chars: EscapeChars | None = escape_chars
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) -> str:
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translate = {"\t": r"\t", "\n": r"\n", "\r": r"\r"}
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if isinstance(escape_chars, dict):
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if default_escapes:
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translate.update(escape_chars)
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else:
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translate = escape_chars
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escape_chars = list(escape_chars.keys())
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else:
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escape_chars = escape_chars or ()
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result = str(thing)
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for c in escape_chars:
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result = result.replace(c, translate[c])
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return result
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if hasattr(thing, "__next__"):
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return str(thing)
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elif isinstance(thing, dict) and _nest_lvl < get_option(
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"display.pprint_nest_depth"
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):
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result = _pprint_dict(
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thing, _nest_lvl, quote_strings=True, max_seq_items=max_seq_items
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)
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elif is_sequence(thing) and _nest_lvl < get_option("display.pprint_nest_depth"):
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result = _pprint_seq(
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thing,
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_nest_lvl,
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escape_chars=escape_chars,
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quote_strings=quote_strings,
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max_seq_items=max_seq_items,
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)
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elif isinstance(thing, str) and quote_strings:
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result = f"'{as_escaped_string(thing)}'"
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else:
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result = as_escaped_string(thing)
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return result
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def pprint_thing_encoded(
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object, encoding: str = "utf-8", errors: str = "replace"
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) -> bytes:
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value = pprint_thing(object) # get unicode representation of object
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return value.encode(encoding, errors)
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def enable_data_resource_formatter(enable: bool) -> None:
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if "IPython" not in sys.modules:
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# definitely not in IPython
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return
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from IPython import get_ipython
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ip = get_ipython()
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if ip is None:
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# still not in IPython
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return
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formatters = ip.display_formatter.formatters
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mimetype = "application/vnd.dataresource+json"
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if enable:
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if mimetype not in formatters:
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# define tableschema formatter
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from IPython.core.formatters import BaseFormatter
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from traitlets import ObjectName
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class TableSchemaFormatter(BaseFormatter):
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print_method = ObjectName("_repr_data_resource_")
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_return_type = (dict,)
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# register it:
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formatters[mimetype] = TableSchemaFormatter()
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# enable it if it's been disabled:
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formatters[mimetype].enabled = True
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# unregister tableschema mime-type
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elif mimetype in formatters:
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formatters[mimetype].enabled = False
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def default_pprint(thing: Any, max_seq_items: int | None = None) -> str:
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return pprint_thing(
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thing,
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escape_chars=("\t", "\r", "\n"),
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quote_strings=True,
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max_seq_items=max_seq_items,
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)
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def format_object_summary(
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obj,
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formatter: Callable,
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is_justify: bool = True,
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name: str | None = None,
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indent_for_name: bool = True,
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line_break_each_value: bool = False,
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) -> str:
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"""
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Return the formatted obj as a unicode string
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Parameters
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----------
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obj : object
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must be iterable and support __getitem__
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formatter : callable
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string formatter for an element
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is_justify : bool
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should justify the display
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name : name, optional
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defaults to the class name of the obj
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indent_for_name : bool, default True
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Whether subsequent lines should be indented to
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align with the name.
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line_break_each_value : bool, default False
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If True, inserts a line break for each value of ``obj``.
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If False, only break lines when the a line of values gets wider
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than the display width.
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Returns
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-------
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summary string
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"""
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display_width, _ = get_console_size()
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if display_width is None:
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display_width = get_option("display.width") or 80
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if name is None:
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name = type(obj).__name__
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if indent_for_name:
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name_len = len(name)
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space1 = f'\n{(" " * (name_len + 1))}'
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space2 = f'\n{(" " * (name_len + 2))}'
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else:
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space1 = "\n"
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space2 = "\n " # space for the opening '['
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n = len(obj)
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if line_break_each_value:
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# If we want to vertically align on each value of obj, we need to
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# separate values by a line break and indent the values
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sep = ",\n " + " " * len(name)
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else:
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sep = ","
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max_seq_items = get_option("display.max_seq_items") or n
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# are we a truncated display
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is_truncated = n > max_seq_items
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# adj can optionally handle unicode eastern asian width
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adj = get_adjustment()
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def _extend_line(
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s: str, line: str, value: str, display_width: int, next_line_prefix: str
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) -> tuple[str, str]:
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if adj.len(line.rstrip()) + adj.len(value.rstrip()) >= display_width:
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s += line.rstrip()
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line = next_line_prefix
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line += value
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return s, line
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def best_len(values: list[str]) -> int:
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if values:
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return max(adj.len(x) for x in values)
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else:
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return 0
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close = ", "
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if n == 0:
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summary = f"[]{close}"
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elif n == 1 and not line_break_each_value:
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first = formatter(obj[0])
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summary = f"[{first}]{close}"
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elif n == 2 and not line_break_each_value:
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first = formatter(obj[0])
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last = formatter(obj[-1])
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summary = f"[{first}, {last}]{close}"
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else:
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if max_seq_items == 1:
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# If max_seq_items=1 show only last element
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head = []
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tail = [formatter(x) for x in obj[-1:]]
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elif n > max_seq_items:
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n = min(max_seq_items // 2, 10)
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head = [formatter(x) for x in obj[:n]]
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tail = [formatter(x) for x in obj[-n:]]
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else:
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head = []
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tail = [formatter(x) for x in obj]
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# adjust all values to max length if needed
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if is_justify:
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if line_break_each_value:
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# Justify each string in the values of head and tail, so the
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# strings will right align when head and tail are stacked
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# vertically.
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head, tail = _justify(head, tail)
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elif is_truncated or not (
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len(", ".join(head)) < display_width
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and len(", ".join(tail)) < display_width
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):
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# Each string in head and tail should align with each other
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max_length = max(best_len(head), best_len(tail))
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head = [x.rjust(max_length) for x in head]
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tail = [x.rjust(max_length) for x in tail]
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# If we are not truncated and we are only a single
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# line, then don't justify
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if line_break_each_value:
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# Now head and tail are of type List[Tuple[str]]. Below we
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# convert them into List[str], so there will be one string per
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# value. Also truncate items horizontally if wider than
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# max_space
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max_space = display_width - len(space2)
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value = tail[0]
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max_items = 1
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for num_items in reversed(range(1, len(value) + 1)):
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pprinted_seq = _pprint_seq(value, max_seq_items=num_items)
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if len(pprinted_seq) < max_space:
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max_items = num_items
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break
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head = [_pprint_seq(x, max_seq_items=max_items) for x in head]
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tail = [_pprint_seq(x, max_seq_items=max_items) for x in tail]
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summary = ""
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line = space2
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for head_value in head:
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word = head_value + sep + " "
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summary, line = _extend_line(summary, line, word, display_width, space2)
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if is_truncated:
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# remove trailing space of last line
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summary += line.rstrip() + space2 + "..."
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line = space2
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for tail_item in tail[:-1]:
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word = tail_item + sep + " "
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summary, line = _extend_line(summary, line, word, display_width, space2)
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# last value: no sep added + 1 space of width used for trailing ','
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summary, line = _extend_line(summary, line, tail[-1], display_width - 2, space2)
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summary += line
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# right now close is either '' or ', '
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# Now we want to include the ']', but not the maybe space.
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close = "]" + close.rstrip(" ")
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summary += close
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if len(summary) > (display_width) or line_break_each_value:
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summary += space1
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else: # one row
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summary += " "
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# remove initial space
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summary = "[" + summary[len(space2) :]
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return summary
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def _justify(
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head: list[Sequence[str]], tail: list[Sequence[str]]
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) -> tuple[list[tuple[str, ...]], list[tuple[str, ...]]]:
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"""
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Justify items in head and tail, so they are right-aligned when stacked.
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Parameters
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----------
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head : list-like of list-likes of strings
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tail : list-like of list-likes of strings
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|
Returns
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-------
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tuple of list of tuples of strings
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Same as head and tail, but items are right aligned when stacked
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vertically.
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Examples
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--------
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>>> _justify([['a', 'b']], [['abc', 'abcd']])
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([(' a', ' b')], [('abc', 'abcd')])
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"""
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combined = head + tail
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# For each position for the sequences in ``combined``,
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# find the length of the largest string.
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max_length = [0] * len(combined[0])
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for inner_seq in combined:
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length = [len(item) for item in inner_seq]
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max_length = [max(x, y) for x, y in zip(max_length, length)]
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# justify each item in each list-like in head and tail using max_length
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head_tuples = [
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tuple(x.rjust(max_len) for x, max_len in zip(seq, max_length)) for seq in head
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]
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tail_tuples = [
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tuple(x.rjust(max_len) for x, max_len in zip(seq, max_length)) for seq in tail
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]
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return head_tuples, tail_tuples
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|
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class PrettyDict(dict[_KT, _VT]):
|
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"""Dict extension to support abbreviated __repr__"""
|
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|
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def __repr__(self) -> str:
|
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return pprint_thing(self)
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|
|
|
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class _TextAdjustment:
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def __init__(self) -> None:
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self.encoding = get_option("display.encoding")
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|
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def len(self, text: str) -> int:
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return len(text)
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|
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def justify(self, texts: Any, max_len: int, mode: str = "right") -> list[str]:
|
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"""
|
|
Perform ljust, center, rjust against string or list-like
|
|
"""
|
|
if mode == "left":
|
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return [x.ljust(max_len) for x in texts]
|
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elif mode == "center":
|
|
return [x.center(max_len) for x in texts]
|
|
else:
|
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return [x.rjust(max_len) for x in texts]
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|
|
def adjoin(self, space: int, *lists, **kwargs) -> str:
|
|
return adjoin(space, *lists, strlen=self.len, justfunc=self.justify, **kwargs)
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|
|
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class _EastAsianTextAdjustment(_TextAdjustment):
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def __init__(self) -> None:
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super().__init__()
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if get_option("display.unicode.ambiguous_as_wide"):
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self.ambiguous_width = 2
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else:
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self.ambiguous_width = 1
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# Definition of East Asian Width
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# https://unicode.org/reports/tr11/
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# Ambiguous width can be changed by option
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self._EAW_MAP = {"Na": 1, "N": 1, "W": 2, "F": 2, "H": 1}
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def len(self, text: str) -> int:
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"""
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Calculate display width considering unicode East Asian Width
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"""
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if not isinstance(text, str):
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return len(text)
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return sum(
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self._EAW_MAP.get(east_asian_width(c), self.ambiguous_width) for c in text
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)
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def justify(
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self, texts: Iterable[str], max_len: int, mode: str = "right"
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) -> list[str]:
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# re-calculate padding space per str considering East Asian Width
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def _get_pad(t):
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return max_len - self.len(t) + len(t)
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if mode == "left":
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return [x.ljust(_get_pad(x)) for x in texts]
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elif mode == "center":
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return [x.center(_get_pad(x)) for x in texts]
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else:
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return [x.rjust(_get_pad(x)) for x in texts]
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def get_adjustment() -> _TextAdjustment:
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use_east_asian_width = get_option("display.unicode.east_asian_width")
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if use_east_asian_width:
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return _EastAsianTextAdjustment()
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else:
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return _TextAdjustment()
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