425 lines
17 KiB
Python
425 lines
17 KiB
Python
__all__ = ['deque', 'defaultdict', 'namedtuple', 'UserDict', 'UserList',
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'UserString']
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# For bootstrapping reasons, the collection ABCs are defined in _abcoll.py.
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# They should however be considered an integral part of collections.py.
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from _abcoll import *
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import _abcoll
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__all__ += _abcoll.__all__
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from _collections import deque, defaultdict
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from operator import itemgetter as _itemgetter
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from keyword import iskeyword as _iskeyword
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import sys as _sys
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################################################################################
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### namedtuple
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################################################################################
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def namedtuple(typename, field_names, verbose=False):
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"""Returns a new subclass of tuple with named fields.
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>>> Point = namedtuple('Point', 'x y')
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>>> Point.__doc__ # docstring for the new class
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'Point(x, y)'
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>>> p = Point(11, y=22) # instantiate with positional args or keywords
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>>> p[0] + p[1] # indexable like a plain tuple
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33
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>>> x, y = p # unpack like a regular tuple
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>>> x, y
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(11, 22)
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>>> p.x + p.y # fields also accessable by name
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33
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>>> d = p._asdict() # convert to a dictionary
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>>> d['x']
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11
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>>> Point(**d) # convert from a dictionary
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Point(x=11, y=22)
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>>> p._replace(x=100) # _replace() is like str.replace() but targets named fields
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Point(x=100, y=22)
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"""
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# Parse and validate the field names. Validation serves two purposes,
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# generating informative error messages and preventing template injection attacks.
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if isinstance(field_names, str):
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field_names = field_names.replace(',', ' ').split() # names separated by whitespace and/or commas
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field_names = tuple(map(str, field_names))
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for name in (typename,) + field_names:
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if not all(c.isalnum() or c=='_' for c in name):
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raise ValueError('Type names and field names can only contain alphanumeric characters and underscores: %r' % name)
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if _iskeyword(name):
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raise ValueError('Type names and field names cannot be a keyword: %r' % name)
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if name[0].isdigit():
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raise ValueError('Type names and field names cannot start with a number: %r' % name)
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seen_names = set()
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for name in field_names:
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if name.startswith('_'):
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raise ValueError('Field names cannot start with an underscore: %r' % name)
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if name in seen_names:
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raise ValueError('Encountered duplicate field name: %r' % name)
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seen_names.add(name)
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# Create and fill-in the class template
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numfields = len(field_names)
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argtxt = repr(field_names).replace("'", "")[1:-1] # tuple repr without parens or quotes
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reprtxt = ', '.join('%s=%%r' % name for name in field_names)
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dicttxt = ', '.join('%r: t[%d]' % (name, pos) for pos, name in enumerate(field_names))
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template = '''class %(typename)s(tuple):
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'%(typename)s(%(argtxt)s)' \n
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__slots__ = () \n
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_fields = %(field_names)r \n
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def __new__(cls, %(argtxt)s):
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return tuple.__new__(cls, (%(argtxt)s)) \n
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@classmethod
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def _make(cls, iterable, new=tuple.__new__, len=len):
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'Make a new %(typename)s object from a sequence or iterable'
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result = new(cls, iterable)
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if len(result) != %(numfields)d:
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raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))
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return result \n
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def __repr__(self):
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return '%(typename)s(%(reprtxt)s)' %% self \n
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def _asdict(t):
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'Return a new dict which maps field names to their values'
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return {%(dicttxt)s} \n
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def _replace(self, **kwds):
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'Return a new %(typename)s object replacing specified fields with new values'
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result = self._make(map(kwds.pop, %(field_names)r, self))
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if kwds:
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raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
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return result \n
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def __getnewargs__(self):
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return tuple(self) \n\n''' % locals()
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for i, name in enumerate(field_names):
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template += ' %s = property(itemgetter(%d))\n' % (name, i)
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if verbose:
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print(template)
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# Execute the template string in a temporary namespace and
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# support tracing utilities by setting a value for frame.f_globals['__name__']
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namespace = dict(itemgetter=_itemgetter, __name__='namedtuple_%s' % typename)
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try:
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exec(template, namespace)
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except SyntaxError as e:
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raise SyntaxError(e.msg + ':\n' + template) from e
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result = namespace[typename]
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# For pickling to work, the __module__ variable needs to be set to the frame
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# where the named tuple is created. Bypass this step in enviroments where
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# sys._getframe is not defined (Jython for example).
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if hasattr(_sys, '_getframe'):
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result.__module__ = _sys._getframe(1).f_globals['__name__']
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return result
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################################################################################
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### UserDict
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################################################################################
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class UserDict(MutableMapping):
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# Start by filling-out the abstract methods
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def __init__(self, dict=None, **kwargs):
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self.data = {}
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if dict is not None:
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self.update(dict)
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if len(kwargs):
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self.update(kwargs)
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def __len__(self): return len(self.data)
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def __getitem__(self, key):
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if key in self.data:
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return self.data[key]
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if hasattr(self.__class__, "__missing__"):
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return self.__class__.__missing__(self, key)
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raise KeyError(key)
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def __setitem__(self, key, item): self.data[key] = item
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def __delitem__(self, key): del self.data[key]
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def __iter__(self):
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return iter(self.data)
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# Modify __contains__ to work correctly when __missing__ is present
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def __contains__(self, key):
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return key in self.data
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# Now, add the methods in dicts but not in MutableMapping
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def __repr__(self): return repr(self.data)
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def copy(self):
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if self.__class__ is UserDict:
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return UserDict(self.data.copy())
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import copy
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data = self.data
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try:
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self.data = {}
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c = copy.copy(self)
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finally:
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self.data = data
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c.update(self)
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return c
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@classmethod
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def fromkeys(cls, iterable, value=None):
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d = cls()
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for key in iterable:
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d[key] = value
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return d
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################################################################################
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### UserList
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################################################################################
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class UserList(MutableSequence):
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"""A more or less complete user-defined wrapper around list objects."""
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def __init__(self, initlist=None):
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self.data = []
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if initlist is not None:
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# XXX should this accept an arbitrary sequence?
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if type(initlist) == type(self.data):
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self.data[:] = initlist
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elif isinstance(initlist, UserList):
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self.data[:] = initlist.data[:]
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else:
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self.data = list(initlist)
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def __repr__(self): return repr(self.data)
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def __lt__(self, other): return self.data < self.__cast(other)
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def __le__(self, other): return self.data <= self.__cast(other)
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def __eq__(self, other): return self.data == self.__cast(other)
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def __ne__(self, other): return self.data != self.__cast(other)
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def __gt__(self, other): return self.data > self.__cast(other)
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def __ge__(self, other): return self.data >= self.__cast(other)
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def __cast(self, other):
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return other.data if isinstance(other, UserList) else other
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def __cmp__(self, other):
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return cmp(self.data, self.__cast(other))
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def __contains__(self, item): return item in self.data
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def __len__(self): return len(self.data)
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def __getitem__(self, i): return self.data[i]
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def __setitem__(self, i, item): self.data[i] = item
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def __delitem__(self, i): del self.data[i]
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def __add__(self, other):
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if isinstance(other, UserList):
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return self.__class__(self.data + other.data)
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elif isinstance(other, type(self.data)):
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return self.__class__(self.data + other)
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return self.__class__(self.data + list(other))
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def __radd__(self, other):
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if isinstance(other, UserList):
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return self.__class__(other.data + self.data)
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elif isinstance(other, type(self.data)):
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return self.__class__(other + self.data)
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return self.__class__(list(other) + self.data)
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def __iadd__(self, other):
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if isinstance(other, UserList):
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self.data += other.data
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elif isinstance(other, type(self.data)):
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self.data += other
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else:
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self.data += list(other)
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return self
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def __mul__(self, n):
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return self.__class__(self.data*n)
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__rmul__ = __mul__
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def __imul__(self, n):
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self.data *= n
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return self
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def append(self, item): self.data.append(item)
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def insert(self, i, item): self.data.insert(i, item)
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def pop(self, i=-1): return self.data.pop(i)
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def remove(self, item): self.data.remove(item)
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def count(self, item): return self.data.count(item)
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def index(self, item, *args): return self.data.index(item, *args)
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def reverse(self): self.data.reverse()
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def sort(self, *args, **kwds): self.data.sort(*args, **kwds)
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def extend(self, other):
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if isinstance(other, UserList):
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self.data.extend(other.data)
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else:
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self.data.extend(other)
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################################################################################
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### UserString
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################################################################################
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class UserString(Sequence):
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def __init__(self, seq):
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if isinstance(seq, str):
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self.data = seq
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elif isinstance(seq, UserString):
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self.data = seq.data[:]
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else:
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self.data = str(seq)
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def __str__(self): return str(self.data)
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def __repr__(self): return repr(self.data)
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def __int__(self): return int(self.data)
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def __long__(self): return int(self.data)
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def __float__(self): return float(self.data)
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def __complex__(self): return complex(self.data)
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def __hash__(self): return hash(self.data)
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def __eq__(self, string):
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if isinstance(string, UserString):
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return self.data == string.data
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return self.data == string
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def __ne__(self, string):
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if isinstance(string, UserString):
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return self.data != string.data
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return self.data != string
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def __lt__(self, string):
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if isinstance(string, UserString):
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return self.data < string.data
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return self.data < string
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def __le__(self, string):
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if isinstance(string, UserString):
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return self.data <= string.data
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return self.data <= string
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def __gt__(self, string):
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if isinstance(string, UserString):
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return self.data > string.data
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return self.data > string
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def __ge__(self, string):
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if isinstance(string, UserString):
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return self.data >= string.data
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return self.data >= string
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def __contains__(self, char):
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if isinstance(char, UserString):
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char = char.data
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return char in self.data
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def __len__(self): return len(self.data)
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def __getitem__(self, index): return self.__class__(self.data[index])
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def __add__(self, other):
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if isinstance(other, UserString):
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return self.__class__(self.data + other.data)
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elif isinstance(other, str):
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return self.__class__(self.data + other)
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return self.__class__(self.data + str(other))
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def __radd__(self, other):
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if isinstance(other, str):
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return self.__class__(other + self.data)
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return self.__class__(str(other) + self.data)
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def __mul__(self, n):
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return self.__class__(self.data*n)
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__rmul__ = __mul__
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def __mod__(self, args):
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return self.__class__(self.data % args)
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# the following methods are defined in alphabetical order:
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def capitalize(self): return self.__class__(self.data.capitalize())
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def center(self, width, *args):
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return self.__class__(self.data.center(width, *args))
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def count(self, sub, start=0, end=_sys.maxsize):
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if isinstance(sub, UserString):
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sub = sub.data
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return self.data.count(sub, start, end)
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def encode(self, encoding=None, errors=None): # XXX improve this?
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if encoding:
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if errors:
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return self.__class__(self.data.encode(encoding, errors))
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return self.__class__(self.data.encode(encoding))
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return self.__class__(self.data.encode())
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def endswith(self, suffix, start=0, end=_sys.maxsize):
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return self.data.endswith(suffix, start, end)
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def expandtabs(self, tabsize=8):
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return self.__class__(self.data.expandtabs(tabsize))
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def find(self, sub, start=0, end=_sys.maxsize):
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if isinstance(sub, UserString):
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sub = sub.data
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return self.data.find(sub, start, end)
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def format(self, *args, **kwds):
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return self.data.format(*args, **kwds)
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def index(self, sub, start=0, end=_sys.maxsize):
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return self.data.index(sub, start, end)
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def isalpha(self): return self.data.isalpha()
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def isalnum(self): return self.data.isalnum()
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def isdecimal(self): return self.data.isdecimal()
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def isdigit(self): return self.data.isdigit()
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def isidentifier(self): return self.data.isidentifier()
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def islower(self): return self.data.islower()
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def isnumeric(self): return self.data.isnumeric()
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def isspace(self): return self.data.isspace()
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def istitle(self): return self.data.istitle()
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def isupper(self): return self.data.isupper()
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def join(self, seq): return self.data.join(seq)
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def ljust(self, width, *args):
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return self.__class__(self.data.ljust(width, *args))
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def lower(self): return self.__class__(self.data.lower())
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def lstrip(self, chars=None): return self.__class__(self.data.lstrip(chars))
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def partition(self, sep):
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return self.data.partition(sep)
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def replace(self, old, new, maxsplit=-1):
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if isinstance(old, UserString):
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old = old.data
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if isinstance(new, UserString):
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new = new.data
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return self.__class__(self.data.replace(old, new, maxsplit))
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def rfind(self, sub, start=0, end=_sys.maxsize):
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return self.data.rfind(sub, start, end)
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def rindex(self, sub, start=0, end=_sys.maxsize):
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return self.data.rindex(sub, start, end)
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def rjust(self, width, *args):
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return self.__class__(self.data.rjust(width, *args))
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def rpartition(self, sep):
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return self.data.rpartition(sep)
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def rstrip(self, chars=None):
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return self.__class__(self.data.rstrip(chars))
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def split(self, sep=None, maxsplit=-1):
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return self.data.split(sep, maxsplit)
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def rsplit(self, sep=None, maxsplit=-1):
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return self.data.rsplit(sep, maxsplit)
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def splitlines(self, keepends=0): return self.data.splitlines(keepends)
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def startswith(self, prefix, start=0, end=_sys.maxsize):
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return self.data.startswith(prefix, start, end)
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def strip(self, chars=None): return self.__class__(self.data.strip(chars))
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def swapcase(self): return self.__class__(self.data.swapcase())
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def title(self): return self.__class__(self.data.title())
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def translate(self, *args):
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return self.__class__(self.data.translate(*args))
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def upper(self): return self.__class__(self.data.upper())
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def zfill(self, width): return self.__class__(self.data.zfill(width))
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################################################################################
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### Simple tests
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################################################################################
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if __name__ == '__main__':
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# verify that instances can be pickled
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from pickle import loads, dumps
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Point = namedtuple('Point', 'x, y', True)
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p = Point(x=10, y=20)
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assert p == loads(dumps(p))
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# test and demonstrate ability to override methods
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class Point(namedtuple('Point', 'x y')):
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__slots__ = ()
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@property
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def hypot(self):
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return (self.x ** 2 + self.y ** 2) ** 0.5
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def __str__(self):
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return 'Point: x=%6.3f y=%6.3f hypot=%6.3f' % (self.x, self.y, self.hypot)
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for p in Point(3, 4), Point(14, 5/7.):
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print (p)
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class Point(namedtuple('Point', 'x y')):
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'Point class with optimized _make() and _replace() without error-checking'
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__slots__ = ()
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_make = classmethod(tuple.__new__)
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def _replace(self, _map=map, **kwds):
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return self._make(_map(kwds.get, ('x', 'y'), self))
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print(Point(11, 22)._replace(x=100))
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Point3D = namedtuple('Point3D', Point._fields + ('z',))
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print(Point3D.__doc__)
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import doctest
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TestResults = namedtuple('TestResults', 'failed attempted')
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print(TestResults(*doctest.testmod()))
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