cpython/Lib/reprlib.py at 3.14 · python/cpython · GitHub

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"""Redo the builtin repr() (representation) but with limits on most sizes."""

__all__ = ["Repr", "repr", "recursive_repr"]

import builtins

from itertools import islice

from _thread import get_ident

def recursive_repr(fillvalue='...'):

'Decorator to make a repr function return fillvalue for a recursive call'

def decorating_function(user_function):

repr_running = set()

def wrapper(self):

key = id(self), get_ident()

if key in repr_running:

return fillvalue

repr_running.add(key)

try:

result = user_function(self)

finally:

repr_running.discard(key)

return result

# Can't use functools.wraps() here because of bootstrap issues

wrapper.__module__ = getattr(user_function, '__module__')

wrapper.__doc__ = getattr(user_function, '__doc__')

wrapper.__name__ = getattr(user_function, '__name__')

wrapper.__qualname__ = getattr(user_function, '__qualname__')

wrapper.__annotate__ = getattr(user_function, '__annotate__', None)

wrapper.__type_params__ = getattr(user_function, '__type_params__', ())

wrapper.__wrapped__ = user_function

return wrapper

return decorating_function

class Repr:

_lookup = {

'tuple': 'builtins',

'list': 'builtins',

'array': 'array',

'set': 'builtins',

'frozenset': 'builtins',

'deque': 'collections',

'dict': 'builtins',

'str': 'builtins',

'int': 'builtins'

}

def __init__(

self, *, maxlevel=6, maxtuple=6, maxlist=6, maxarray=5, maxdict=4,

maxset=6, maxfrozenset=6, maxdeque=6, maxstring=30, maxlong=40,

maxother=30, fillvalue='...', indent=None,

self.maxlevel = maxlevel

self.maxtuple = maxtuple

self.maxlist = maxlist

self.maxarray = maxarray

self.maxdict = maxdict

self.maxset = maxset

self.maxfrozenset = maxfrozenset

self.maxdeque = maxdeque

self.maxstring = maxstring

self.maxlong = maxlong

self.maxother = maxother

self.fillvalue = fillvalue

self.indent = indent

def repr(self, x):

return self.repr1(x, self.maxlevel)

def repr1(self, x, level):

cls = type(x)

typename = cls.__name__

if ' ' in typename:

parts = typename.split()

typename = '_'.join(parts)

method = getattr(self, 'repr_' + typename, None)

if method:

# not defined in this class

if typename not in self._lookup:

return method(x, level)

module = getattr(cls, '__module__', None)

# defined in this class and is the module intended

if module == self._lookup[typename]:

return method(x, level)

return self.repr_instance(x, level)

def _join(self, pieces, level):

if self.indent is None:

return ', '.join(pieces)

if not pieces:

return ''

indent = self.indent

if isinstance(indent, int):

if indent < 0:

raise ValueError(

f'Repr.indent cannot be negative int (was {indent!r})'

)

indent *= ' '

try:

sep = ',\n' + (self.maxlevel - level + 1) * indent

except TypeError as error:

raise TypeError(

f'Repr.indent must be a str, int or None, not {type(indent)}'

) from error

return sep.join(('', *pieces, ''))[1:-len(indent) or None]

def _repr_iterable(self, x, level, left, right, maxiter, trail=''):

n = len(x)

if level <= 0 and n:

s = self.fillvalue

else:

newlevel = level - 1

repr1 = self.repr1

pieces = [repr1(elem, newlevel) for elem in islice(x, maxiter)]

if n > maxiter:

pieces.append(self.fillvalue)

s = self._join(pieces, level)

if n == 1 and trail and self.indent is None:

right = trail + right

return '%s%s%s' % (left, s, right)

def repr_tuple(self, x, level):

return self._repr_iterable(x, level, '(', ')', self.maxtuple, ',')

def repr_list(self, x, level):

return self._repr_iterable(x, level, '[', ']', self.maxlist)

def repr_array(self, x, level):

if not x:

return "array('%s')" % x.typecode

header = "array('%s', [" % x.typecode

return self._repr_iterable(x, level, header, '])', self.maxarray)

def repr_set(self, x, level):

if not x:

return 'set()'

x = _possibly_sorted(x)

return self._repr_iterable(x, level, '{', '}', self.maxset)

def repr_frozenset(self, x, level):

if not x:

return 'frozenset()'

x = _possibly_sorted(x)

return self._repr_iterable(x, level, 'frozenset({', '})',

self.maxfrozenset)

def repr_deque(self, x, level):

return self._repr_iterable(x, level, 'deque([', '])', self.maxdeque)

def repr_dict(self, x, level):

n = len(x)

if n == 0:

return '{}'

if level <= 0:

return '{' + self.fillvalue + '}'

newlevel = level - 1

repr1 = self.repr1

pieces = []

for key in islice(_possibly_sorted(x), self.maxdict):

keyrepr = repr1(key, newlevel)

valrepr = repr1(x[key], newlevel)

pieces.append('%s: %s' % (keyrepr, valrepr))

if n > self.maxdict:

pieces.append(self.fillvalue)

s = self._join(pieces, level)

return '{%s}' % (s,)

def repr_str(self, x, level):

s = builtins.repr(x[:self.maxstring])

if len(s) > self.maxstring:

i = max(0, (self.maxstring-3)//2)

j = max(0, self.maxstring-3-i)

s = builtins.repr(x[:i] + x[len(x)-j:])

s = s[:i] + self.fillvalue + s[len(s)-j:]

return s

def repr_int(self, x, level):

try:

s = builtins.repr(x)

except ValueError as exc:

assert 'sys.set_int_max_str_digits()' in str(exc)

# Those imports must be deferred due to Python's build system

# where the reprlib module is imported before the math module.

import math, sys

# Integers with more than sys.get_int_max_str_digits() digits

# are rendered differently as their repr() raises a ValueError.

# See https://github.com/python/cpython/issues/135487.

k = 1 + int(math.log10(abs(x)))

# Note: math.log10(abs(x)) may be overestimated or underestimated,

# but for simplicity, we do not compute the exact number of digits.

max_digits = sys.get_int_max_str_digits()

return (f'<{x.__class__.__name__} instance with roughly {k} '

f'digits (limit at {max_digits}) at 0x{id(x):x}>')

if len(s) > self.maxlong:

i = max(0, (self.maxlong-3)//2)

j = max(0, self.maxlong-3-i)

s = s[:i] + self.fillvalue + s[len(s)-j:]

return s

def repr_instance(self, x, level):

try:

s = builtins.repr(x)

# Bugs in x.__repr__() can cause arbitrary

# exceptions -- then make up something

except Exception:

return '<%s instance at %#x>' % (x.__class__.__name__, id(x))

if len(s) > self.maxother:

i = max(0, (self.maxother-3)//2)

j = max(0, self.maxother-3-i)

s = s[:i] + self.fillvalue + s[len(s)-j:]

return s

def _possibly_sorted(x):

# Since not all sequences of items can be sorted and comparison

# functions may raise arbitrary exceptions, return an unsorted

# sequence in that case.

try:

return sorted(x)

except Exception:

return list(x)

aRepr = Repr()

repr = aRepr.repr

cpython/Lib/reprlib.py at 3.14 · python/cpython · GitHub

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cpython/Lib/reprlib.py at 3.14 · python/cpython · GitHub

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