""" Printing tools. """ import sys from typing import ( Any, Callable, Iterable, List, Mapping, Optional, Sequence, Tuple, Union, ) from pandas._config import get_option from pandas.core.dtypes.inference import is_sequence EscapeChars = Union[Mapping[str, str], Iterable[str]] def adjoin(space: int, *lists: List[str], **kwargs) -> str: """ Glues together two sets of strings using the amount of space requested. The idea is to prettify. ---------- space : int number of spaces for padding lists : str list of str which being joined strlen : callable function used to calculate the length of each str. Needed for unicode handling. justfunc : callable function used to justify str. Needed for unicode handling. """ strlen = kwargs.pop("strlen", len) justfunc = kwargs.pop("justfunc", justify) out_lines = [] newLists = [] lengths = [max(map(strlen, x)) + space for x in lists[:-1]] # not the last one lengths.append(max(map(len, lists[-1]))) maxLen = max(map(len, lists)) for i, lst in enumerate(lists): nl = justfunc(lst, lengths[i], mode="left") nl.extend([" " * lengths[i]] * (maxLen - len(lst))) newLists.append(nl) toJoin = zip(*newLists) for lines in toJoin: out_lines.append("".join(lines)) return "\n".join(out_lines) def justify(texts: Iterable[str], max_len: int, mode: str = "right") -> List[str]: """ Perform ljust, center, rjust against string or list-like """ if mode == "left": return [x.ljust(max_len) for x in texts] elif mode == "center": return [x.center(max_len) for x in texts] else: return [x.rjust(max_len) for x in texts] # Unicode consolidation # --------------------- # # pprinting utility functions for generating Unicode text or # bytes(3.x)/str(2.x) representations of objects. # Try to use these as much as possible rather then rolling your own. # # When to use # ----------- # # 1) If you're writing code internal to pandas (no I/O directly involved), # use pprint_thing(). # # It will always return unicode text which can handled by other # parts of the package without breakage. # # 2) if you need to write something out to file, use # pprint_thing_encoded(encoding). # # If no encoding is specified, it defaults to utf-8. Since encoding pure # ascii with utf-8 is a no-op you can safely use the default utf-8 if you're # working with straight ascii. def _pprint_seq( seq: Sequence, _nest_lvl: int = 0, max_seq_items: Optional[int] = None, **kwds ) -> str: """ internal. pprinter for iterables. you should probably use pprint_thing() rather then calling this directly. bounds length of printed sequence, depending on options """ if isinstance(seq, set): fmt = "{{{body}}}" else: fmt = "[{body}]" if hasattr(seq, "__setitem__") else "({body})" if max_seq_items is False: nitems = len(seq) else: nitems = max_seq_items or get_option("max_seq_items") or len(seq) s = iter(seq) # handle sets, no slicing r = [ pprint_thing(next(s), _nest_lvl + 1, max_seq_items=max_seq_items, **kwds) for i in range(min(nitems, len(seq))) ] body = ", ".join(r) if nitems < len(seq): body += ", ..." elif isinstance(seq, tuple) and len(seq) == 1: body += "," return fmt.format(body=body) def _pprint_dict( seq: Mapping, _nest_lvl: int = 0, max_seq_items: Optional[int] = None, **kwds ) -> str: """ internal. pprinter for iterables. you should probably use pprint_thing() rather then calling this directly. """ fmt = "{{{things}}}" pairs = [] pfmt = "{key}: {val}" if max_seq_items is False: nitems = len(seq) else: nitems = max_seq_items or get_option("max_seq_items") or len(seq) for k, v in list(seq.items())[:nitems]: pairs.append( pfmt.format( key=pprint_thing(k, _nest_lvl + 1, max_seq_items=max_seq_items, **kwds), val=pprint_thing(v, _nest_lvl + 1, max_seq_items=max_seq_items, **kwds), ) ) if nitems < len(seq): return fmt.format(things=", ".join(pairs) + ", ...") else: return fmt.format(things=", ".join(pairs)) def pprint_thing( thing: Any, _nest_lvl: int = 0, escape_chars: Optional[EscapeChars] = None, default_escapes: bool = False, quote_strings: bool = False, max_seq_items: Optional[int] = None, ) -> str: """ This function is the sanctioned way of converting objects to a string representation and properly handles nested sequences. Parameters ---------- thing : anything to be formatted _nest_lvl : internal use only. pprint_thing() is mutually-recursive with pprint_sequence, this argument is used to keep track of the current nesting level, and limit it. escape_chars : list or dict, optional Characters to escape. If a dict is passed the values are the replacements default_escapes : bool, default False Whether the input escape characters replaces or adds to the defaults max_seq_items : int or None, default None Pass through to other pretty printers to limit sequence printing Returns ------- str """ def as_escaped_string( thing: Any, escape_chars: Optional[EscapeChars] = escape_chars ) -> str: translate = {"\t": r"\t", "\n": r"\n", "\r": r"\r"} if isinstance(escape_chars, dict): if default_escapes: translate.update(escape_chars) else: translate = escape_chars escape_chars = list(escape_chars.keys()) else: escape_chars = escape_chars or tuple() result = str(thing) for c in escape_chars: result = result.replace(c, translate[c]) return result if hasattr(thing, "__next__"): return str(thing) elif isinstance(thing, dict) and _nest_lvl < get_option( "display.pprint_nest_depth" ): result = _pprint_dict( thing, _nest_lvl, quote_strings=True, max_seq_items=max_seq_items ) elif is_sequence(thing) and _nest_lvl < get_option("display.pprint_nest_depth"): result = _pprint_seq( thing, _nest_lvl, escape_chars=escape_chars, quote_strings=quote_strings, max_seq_items=max_seq_items, ) elif isinstance(thing, str) and quote_strings: result = "'{thing}'".format(thing=as_escaped_string(thing)) else: result = as_escaped_string(thing) return result def pprint_thing_encoded( object, encoding: str = "utf-8", errors: str = "replace" ) -> bytes: value = pprint_thing(object) # get unicode representation of object return value.encode(encoding, errors) def _enable_data_resource_formatter(enable: bool) -> None: if "IPython" not in sys.modules: # definitely not in IPython return from IPython import get_ipython ip = get_ipython() if ip is None: # still not in IPython return formatters = ip.display_formatter.formatters mimetype = "application/vnd.dataresource+json" if enable: if mimetype not in formatters: # define tableschema formatter from IPython.core.formatters import BaseFormatter class TableSchemaFormatter(BaseFormatter): print_method = "_repr_data_resource_" _return_type = (dict,) # register it: formatters[mimetype] = TableSchemaFormatter() # enable it if it's been disabled: formatters[mimetype].enabled = True else: # unregister tableschema mime-type if mimetype in formatters: formatters[mimetype].enabled = False default_pprint = lambda x, max_seq_items=None: pprint_thing( x, escape_chars=("\t", "\r", "\n"), quote_strings=True, max_seq_items=max_seq_items ) def format_object_summary( obj, formatter: Callable, is_justify: bool = True, name: Optional[str] = None, indent_for_name: bool = True, line_break_each_value: bool = False, ) -> str: """ Return the formatted obj as a unicode string Parameters ---------- obj : object must be iterable and support __getitem__ formatter : callable string formatter for an element is_justify : boolean should justify the display name : name, optional defaults to the class name of the obj indent_for_name : bool, default True Whether subsequent lines should be be indented to align with the name. line_break_each_value : bool, default False If True, inserts a line break for each value of ``obj``. If False, only break lines when the a line of values gets wider than the display width. .. versionadded:: 0.25.0 Returns ------- summary string """ from pandas.io.formats.console import get_console_size from pandas.io.formats.format import _get_adjustment display_width, _ = get_console_size() if display_width is None: display_width = get_option("display.width") or 80 if name is None: name = type(obj).__name__ if indent_for_name: name_len = len(name) space1 = f'\n{(" " * (name_len + 1))}' space2 = f'\n{(" " * (name_len + 2))}' else: space1 = "\n" space2 = "\n " # space for the opening '[' n = len(obj) if line_break_each_value: # If we want to vertically align on each value of obj, we need to # separate values by a line break and indent the values sep = ",\n " + " " * len(name) else: sep = "," max_seq_items = get_option("display.max_seq_items") or n # are we a truncated display is_truncated = n > max_seq_items # adj can optionally handle unicode eastern asian width adj = _get_adjustment() def _extend_line( s: str, line: str, value: str, display_width: int, next_line_prefix: str ) -> Tuple[str, str]: if adj.len(line.rstrip()) + adj.len(value.rstrip()) >= display_width: s += line.rstrip() line = next_line_prefix line += value return s, line def best_len(values: List[str]) -> int: if values: return max(adj.len(x) for x in values) else: return 0 close = ", " if n == 0: summary = f"[]{close}" elif n == 1 and not line_break_each_value: first = formatter(obj[0]) summary = f"[{first}]{close}" elif n == 2 and not line_break_each_value: first = formatter(obj[0]) last = formatter(obj[-1]) summary = f"[{first}, {last}]{close}" else: if n > max_seq_items: n = min(max_seq_items // 2, 10) head = [formatter(x) for x in obj[:n]] tail = [formatter(x) for x in obj[-n:]] else: head = [] tail = [formatter(x) for x in obj] # adjust all values to max length if needed if is_justify: if line_break_each_value: # Justify each string in the values of head and tail, so the # strings will right align when head and tail are stacked # vertically. head, tail = _justify(head, tail) elif is_truncated or not ( len(", ".join(head)) < display_width and len(", ".join(tail)) < display_width ): # Each string in head and tail should align with each other max_length = max(best_len(head), best_len(tail)) head = [x.rjust(max_length) for x in head] tail = [x.rjust(max_length) for x in tail] # If we are not truncated and we are only a single # line, then don't justify if line_break_each_value: # Now head and tail are of type List[Tuple[str]]. Below we # convert them into List[str], so there will be one string per # value. Also truncate items horizontally if wider than # max_space max_space = display_width - len(space2) value = tail[0] for max_items in reversed(range(1, len(value) + 1)): pprinted_seq = _pprint_seq(value, max_seq_items=max_items) if len(pprinted_seq) < max_space: break head = [_pprint_seq(x, max_seq_items=max_items) for x in head] tail = [_pprint_seq(x, max_seq_items=max_items) for x in tail] summary = "" line = space2 for max_items in range(len(head)): word = head[max_items] + sep + " " summary, line = _extend_line(summary, line, word, display_width, space2) if is_truncated: # remove trailing space of last line summary += line.rstrip() + space2 + "..." line = space2 for max_items in range(len(tail) - 1): word = tail[max_items] + sep + " " summary, line = _extend_line(summary, line, word, display_width, space2) # last value: no sep added + 1 space of width used for trailing ',' summary, line = _extend_line(summary, line, tail[-1], display_width - 2, space2) summary += line # right now close is either '' or ', ' # Now we want to include the ']', but not the maybe space. close = "]" + close.rstrip(" ") summary += close if len(summary) > (display_width) or line_break_each_value: summary += space1 else: # one row summary += " " # remove initial space summary = "[" + summary[len(space2) :] return summary def _justify( head: List[Sequence[str]], tail: List[Sequence[str]] ) -> Tuple[List[Tuple[str, ...]], List[Tuple[str, ...]]]: """ Justify items in head and tail, so they are right-aligned when stacked. Parameters ---------- head : list-like of list-likes of strings tail : list-like of list-likes of strings Returns ------- tuple of list of tuples of strings Same as head and tail, but items are right aligned when stacked vertically. Examples -------- >>> _justify([['a', 'b']], [['abc', 'abcd']]) ([(' a', ' b')], [('abc', 'abcd')]) """ combined = head + tail # For each position for the sequences in ``combined``, # find the length of the largest string. max_length = [0] * len(combined[0]) for inner_seq in combined: length = [len(item) for item in inner_seq] max_length = [max(x, y) for x, y in zip(max_length, length)] # justify each item in each list-like in head and tail using max_length head = [ tuple(x.rjust(max_len) for x, max_len in zip(seq, max_length)) for seq in head ] tail = [ tuple(x.rjust(max_len) for x, max_len in zip(seq, max_length)) for seq in tail ] # https://github.com/python/mypy/issues/4975 # error: Incompatible return value type (got "Tuple[List[Sequence[str]], # List[Sequence[str]]]", expected "Tuple[List[Tuple[str, ...]], # List[Tuple[str, ...]]]") return head, tail # type: ignore def format_object_attrs( obj: Sequence, include_dtype: bool = True ) -> List[Tuple[str, Union[str, int]]]: """ Return a list of tuples of the (attr, formatted_value) for common attrs, including dtype, name, length Parameters ---------- obj : object must be iterable include_dtype : bool If False, dtype won't be in the returned list Returns ------- list of 2-tuple """ attrs: List[Tuple[str, Union[str, int]]] = [] if hasattr(obj, "dtype") and include_dtype: # error: "Sequence[Any]" has no attribute "dtype" attrs.append(("dtype", f"'{obj.dtype}'")) # type: ignore if getattr(obj, "name", None) is not None: # error: "Sequence[Any]" has no attribute "name" attrs.append(("name", default_pprint(obj.name))) # type: ignore # error: "Sequence[Any]" has no attribute "names" elif getattr(obj, "names", None) is not None and any(obj.names): # type: ignore # error: "Sequence[Any]" has no attribute "names" attrs.append(("names", default_pprint(obj.names))) # type: ignore max_seq_items = get_option("display.max_seq_items") or len(obj) if len(obj) > max_seq_items: attrs.append(("length", len(obj))) return attrs