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cpython/Lib/collections.py

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__all__ = ['deque', 'defaultdict', 'namedtuple', 'UserDict', 'UserList',
'UserString', 'Counter', 'OrderedDict']
# For bootstrapping reasons, the collection ABCs are defined in _abcoll.py.
# They should however be considered an integral part of collections.py.
from _abcoll import *
import _abcoll
__all__ += _abcoll.__all__
from _collections import deque, defaultdict
from operator import itemgetter as _itemgetter
from keyword import iskeyword as _iskeyword
import sys as _sys
import heapq as _heapq
from itertools import repeat as _repeat, chain as _chain, starmap as _starmap
################################################################################
### OrderedDict
################################################################################
class OrderedDict(dict, MutableMapping):
'Dictionary that remembers insertion order'
# An inherited dict maps keys to values.
# The inherited dict provides __getitem__, __len__, __contains__, and get.
# The remaining methods are order-aware.
# Big-O running times for all methods are the same as for regular dictionaries.
# The internal self.__map dictionary maps keys to links in a doubly linked list.
# The circular doubly linked list starts and ends with a sentinel element.
# The sentinel element never gets deleted (this simplifies the algorithm).
# Each link is stored as a list of length three: [PREV, NEXT, KEY].
def __init__(self, *args, **kwds):
'''Initialize an ordered dictionary. Signature is the same as for
regular dictionaries, but keyword arguments are not recommended
because their insertion order is arbitrary.
'''
if len(args) > 1:
raise TypeError('expected at most 1 arguments, got %d' % len(args))
try:
self.__root
except AttributeError:
self.__root = root = [None, None, None] # sentinel node
PREV = 0
NEXT = 1
root[PREV] = root[NEXT] = root
self.__map = {}
self.update(*args, **kwds)
def __setitem__(self, key, value, PREV=0, NEXT=1, dict_setitem=dict.__setitem__):
'od.__setitem__(i, y) <==> od[i]=y'
# Setting a new item creates a new link which goes at the end of the linked
# list, and the inherited dictionary is updated with the new key/value pair.
if key not in self:
root = self.__root
last = root[PREV]
last[NEXT] = root[PREV] = self.__map[key] = [last, root, key]
dict_setitem(self, key, value)
def __delitem__(self, key, PREV=0, NEXT=1, dict_delitem=dict.__delitem__):
'od.__delitem__(y) <==> del od[y]'
# Deleting an existing item uses self.__map to find the link which is
# then removed by updating the links in the predecessor and successor nodes.
dict_delitem(self, key)
link = self.__map.pop(key)
link_prev = link[PREV]
link_next = link[NEXT]
link_prev[NEXT] = link_next
link_next[PREV] = link_prev
def __iter__(self, NEXT=1, KEY=2):
'od.__iter__() <==> iter(od)'
# Traverse the linked list in order.
root = self.__root
curr = root[NEXT]
while curr is not root:
yield curr[KEY]
curr = curr[NEXT]
def __reversed__(self, PREV=0, KEY=2):
'od.__reversed__() <==> reversed(od)'
# Traverse the linked list in reverse order.
root = self.__root
curr = root[PREV]
while curr is not root:
yield curr[KEY]
curr = curr[PREV]
def __reduce__(self):
'Return state information for pickling'
items = [[k, self[k]] for k in self]
tmp = self.__map, self.__root
del self.__map, self.__root
inst_dict = vars(self).copy()
self.__map, self.__root = tmp
if inst_dict:
return (self.__class__, (items,), inst_dict)
return self.__class__, (items,)
def clear(self):
'od.clear() -> None. Remove all items from od.'
try:
for node in self.__map.values():
del node[:]
self.__root[:] = [self.__root, self.__root, None]
self.__map.clear()
except AttributeError:
pass
dict.clear(self)
def popitem(self, last=True, PREV=0, NEXT=1, KEY=2, dict_pop=dict.pop):
'''od.popitem() -> (k, v), return and remove a (key, value) pair.
Pairs are returned in LIFO order if last is true or FIFO order if false.
'''
if not self:
raise KeyError('dictionary is empty')
root = self.__root
if last: # link_prev <--> link <--> root
link = root[PREV]
link_prev = link[PREV]
link_prev[NEXT] = root
root[PREV] = link_prev
else: # root <--> link <--> link_next
link = root[NEXT]
link_next = link[NEXT]
root[NEXT] = link_next
link_next[PREV] = root
key = link[KEY]
del self.__map[key]
value = dict_pop(self, key)
return key, value
setdefault = MutableMapping.setdefault
update = MutableMapping.update
pop = MutableMapping.pop
keys = MutableMapping.keys
values = MutableMapping.values
items = MutableMapping.items
__ne__ = MutableMapping.__ne__
def __repr__(self):
'od.__repr__() <==> repr(od)'
if not self:
return '%s()' % (self.__class__.__name__,)
return '%s(%r)' % (self.__class__.__name__, list(self.items()))
def copy(self):
'od.copy() -> a shallow copy of od'
return self.__class__(self)
@classmethod
def fromkeys(cls, iterable, value=None):
'''OD.fromkeys(S[, v]) -> New ordered dictionary with keys from S
and values equal to v (which defaults to None).
'''
d = cls()
for key in iterable:
d[key] = value
return d
def __eq__(self, other):
'''od.__eq__(y) <==> od==y. Comparison to another OD is order-sensitive
while comparison to a regular mapping is order-insensitive.
'''
if isinstance(other, OrderedDict):
return len(self)==len(other) and \
all(p==q for p, q in zip(self.items(), other.items()))
return dict.__eq__(self, other)
def __del__(self):
self.clear() # eliminate cyclical references
def _renew(self, key, PREV=0, NEXT=1):
'Fast version of self[key]=self.pop(key). Private method for internal use.'
link = self.__map[key]
link_prev = link[PREV]
link_next = link[NEXT]
link_prev[NEXT] = link_next
link_next[PREV] = link_prev
root = self.__root
last = root[PREV]
link[PREV] = last
link[NEXT] = root
last[NEXT] = root[PREV] = link
################################################################################
### namedtuple
################################################################################
def namedtuple(typename, field_names, verbose=False, rename=False):
"""Returns a new subclass of tuple with named fields.
>>> Point = namedtuple('Point', 'x y')
>>> Point.__doc__ # docstring for the new class
'Point(x, y)'
>>> p = Point(11, y=22) # instantiate with positional args or keywords
>>> p[0] + p[1] # indexable like a plain tuple
33
>>> x, y = p # unpack like a regular tuple
>>> x, y
(11, 22)
>>> p.x + p.y # fields also accessable by name
33
>>> d = p._asdict() # convert to a dictionary
>>> d['x']
11
>>> Point(**d) # convert from a dictionary
Point(x=11, y=22)
>>> p._replace(x=100) # _replace() is like str.replace() but targets named fields
Point(x=100, y=22)
"""
# Parse and validate the field names. Validation serves two purposes,
# generating informative error messages and preventing template injection attacks.
if isinstance(field_names, str):
field_names = field_names.replace(',', ' ').split() # names separated by whitespace and/or commas
field_names = tuple(map(str, field_names))
if rename:
names = list(field_names)
seen = set()
for i, name in enumerate(names):
if (not all(c.isalnum() or c=='_' for c in name) or _iskeyword(name)
or not name or name[0].isdigit() or name.startswith('_')
or name in seen):
names[i] = '_%d' % i
seen.add(name)
field_names = tuple(names)
for name in (typename,) + field_names:
if not all(c.isalnum() or c=='_' for c in name):
raise ValueError('Type names and field names can only contain alphanumeric characters and underscores: %r' % name)
if _iskeyword(name):
raise ValueError('Type names and field names cannot be a keyword: %r' % name)
if name[0].isdigit():
raise ValueError('Type names and field names cannot start with a number: %r' % name)
seen_names = set()
for name in field_names:
if name.startswith('_') and not rename:
raise ValueError('Field names cannot start with an underscore: %r' % name)
if name in seen_names:
raise ValueError('Encountered duplicate field name: %r' % name)
seen_names.add(name)
# Create and fill-in the class template
numfields = len(field_names)
argtxt = repr(field_names).replace("'", "")[1:-1] # tuple repr without parens or quotes
reprtxt = ', '.join('%s=%%r' % name for name in field_names)
template = '''class %(typename)s(tuple):
'%(typename)s(%(argtxt)s)' \n
__slots__ = () \n
_fields = %(field_names)r \n
def __new__(_cls, %(argtxt)s):
'Create new instance of %(typename)s(%(argtxt)s)'
return _tuple.__new__(_cls, (%(argtxt)s)) \n
@classmethod
def _make(cls, iterable, new=tuple.__new__, len=len):
'Make a new %(typename)s object from a sequence or iterable'
result = new(cls, iterable)
if len(result) != %(numfields)d:
raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))
return result \n
def __repr__(self):
'Return a nicely formatted representation string'
return self.__class__.__name__ + '(%(reprtxt)s)' %% self \n
def _asdict(self):
'Return a new OrderedDict which maps field names to their values'
return OrderedDict(zip(self._fields, self)) \n
def _replace(_self, **kwds):
'Return a new %(typename)s object replacing specified fields with new values'
result = _self._make(map(kwds.pop, %(field_names)r, _self))
if kwds:
raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
return result \n
def __getnewargs__(self):
'Return self as a plain tuple. Used by copy and pickle.'
return tuple(self) \n\n''' % locals()
for i, name in enumerate(field_names):
template += " %s = _property(_itemgetter(%d), doc='Alias for field number %d')\n" % (name, i, i)
if verbose:
print(template)
# Execute the template string in a temporary namespace and
# support tracing utilities by setting a value for frame.f_globals['__name__']
namespace = dict(_itemgetter=_itemgetter, __name__='namedtuple_%s' % typename,
OrderedDict=OrderedDict, _property=property, _tuple=tuple)
try:
exec(template, namespace)
except SyntaxError as e:
raise SyntaxError(e.msg + ':\n' + template) from e
result = namespace[typename]
# For pickling to work, the __module__ variable needs to be set to the frame
# where the named tuple is created. Bypass this step in enviroments where
# sys._getframe is not defined (Jython for example) or sys._getframe is not
# defined for arguments greater than 0 (IronPython).
try:
result.__module__ = _sys._getframe(1).f_globals.get('__name__', '__main__')
except (AttributeError, ValueError):
pass
return result
########################################################################
### Counter
########################################################################
class Counter(dict):
'''Dict subclass for counting hashable items. Sometimes called a bag
or multiset. Elements are stored as dictionary keys and their counts
are stored as dictionary values.
>>> c = Counter('abracadabra') # count elements from a string
>>> c.most_common(3) # three most common elements
[('a', 5), ('r', 2), ('b', 2)]
>>> sorted(c) # list all unique elements
['a', 'b', 'c', 'd', 'r']
>>> ''.join(sorted(c.elements())) # list elements with repetitions
'aaaaabbcdrr'
>>> sum(c.values()) # total of all counts
11
>>> c['a'] # count of letter 'a'
5
>>> for elem in 'shazam': # update counts from an iterable
... c[elem] += 1 # by adding 1 to each element's count
>>> c['a'] # now there are seven 'a'
7
>>> del c['r'] # remove all 'r'
>>> c['r'] # now there are zero 'r'
0
>>> d = Counter('simsalabim') # make another counter
>>> c.update(d) # add in the second counter
>>> c['a'] # now there are nine 'a'
9
>>> c.clear() # empty the counter
>>> c
Counter()
Note: If a count is set to zero or reduced to zero, it will remain
in the counter until the entry is deleted or the counter is cleared:
>>> c = Counter('aaabbc')
>>> c['b'] -= 2 # reduce the count of 'b' by two
>>> c.most_common() # 'b' is still in, but its count is zero
[('a', 3), ('c', 1), ('b', 0)]
'''
# References:
# http://en.wikipedia.org/wiki/Multiset
# http://www.gnu.org/software/smalltalk/manual-base/html_node/Bag.html
# http://www.demo2s.com/Tutorial/Cpp/0380__set-multiset/Catalog0380__set-multiset.htm
# http://code.activestate.com/recipes/259174/
# Knuth, TAOCP Vol. II section 4.6.3
def __init__(self, iterable=None, **kwds):
'''Create a new, empty Counter object. And if given, count elements
from an input iterable. Or, initialize the count from another mapping
of elements to their counts.
>>> c = Counter() # a new, empty counter
>>> c = Counter('gallahad') # a new counter from an iterable
>>> c = Counter({'a': 4, 'b': 2}) # a new counter from a mapping
>>> c = Counter(a=4, b=2) # a new counter from keyword args
'''
self.update(iterable, **kwds)
def __missing__(self, key):
'The count of elements not in the Counter is zero.'
# Needed so that self[missing_item] does not raise KeyError
return 0
def most_common(self, n=None):
'''List the n most common elements and their counts from the most
common to the least. If n is None, then list all element counts.
>>> Counter('abracadabra').most_common(3)
[('a', 5), ('r', 2), ('b', 2)]
'''
# Emulate Bag.sortedByCount from Smalltalk
if n is None:
return sorted(self.items(), key=_itemgetter(1), reverse=True)
return _heapq.nlargest(n, self.items(), key=_itemgetter(1))
def elements(self):
'''Iterator over elements repeating each as many times as its count.
>>> c = Counter('ABCABC')
>>> sorted(c.elements())
['A', 'A', 'B', 'B', 'C', 'C']
# Knuth's example for prime factors of 1836: 2**2 * 3**3 * 17**1
>>> prime_factors = Counter({2: 2, 3: 3, 17: 1})
>>> product = 1
>>> for factor in prime_factors.elements(): # loop over factors
... product *= factor # and multiply them
>>> product
1836
Note, if an element's count has been set to zero or is a negative
number, elements() will ignore it.
'''
# Emulate Bag.do from Smalltalk and Multiset.begin from C++.
return _chain.from_iterable(_starmap(_repeat, self.items()))
# Override dict methods where necessary
@classmethod
def fromkeys(cls, iterable, v=None):
# There is no equivalent method for counters because setting v=1
# means that no element can have a count greater than one.
raise NotImplementedError(
'Counter.fromkeys() is undefined. Use Counter(iterable) instead.')
def update(self, iterable=None, **kwds):
'''Like dict.update() but add counts instead of replacing them.
Source can be an iterable, a dictionary, or another Counter instance.
>>> c = Counter('which')
>>> c.update('witch') # add elements from another iterable
>>> d = Counter('watch')
>>> c.update(d) # add elements from another counter
>>> c['h'] # four 'h' in which, witch, and watch
4
'''
# The regular dict.update() operation makes no sense here because the
# replace behavior results in the some of original untouched counts
# being mixed-in with all of the other counts for a mismash that
# doesn't have a straight-forward interpretation in most counting
# contexts. Instead, we implement straight-addition. Both the inputs
# and outputs are allowed to contain zero and negative counts.
if iterable is not None:
if isinstance(iterable, Mapping):
if self:
self_get = self.get
for elem, count in iterable.items():
self[elem] = count + self_get(elem, 0)
else:
dict.update(self, iterable) # fast path when counter is empty
else:
self_get = self.get
for elem in iterable:
self[elem] = 1 + self_get(elem, 0)
if kwds:
self.update(kwds)
def subtract(self, iterable=None, **kwds):
'''Like dict.update() but subtracts counts instead of replacing them.
Counts can be reduced below zero. Both the inputs and outputs are
allowed to contain zero and negative counts.
Source can be an iterable, a dictionary, or another Counter instance.
>>> c = Counter('which')
>>> c.subtract('witch') # subtract elements from another iterable
>>> c.subtract(Counter('watch')) # subtract elements from another counter
>>> c['h'] # 2 in which, minus 1 in witch, minus 1 in watch
0
>>> c['w'] # 1 in which, minus 1 in witch, minus 1 in watch
-1
'''
if iterable is not None:
self_get = self.get
if isinstance(iterable, Mapping):
for elem, count in iterable.items():
self[elem] = self_get(elem, 0) - count
else:
for elem in iterable:
self[elem] = self_get(elem, 0) - 1
if kwds:
self.subtract(kwds)
def copy(self):
'Like dict.copy() but returns a Counter instance instead of a dict.'
return Counter(self)
def __delitem__(self, elem):
'Like dict.__delitem__() but does not raise KeyError for missing values.'
if elem in self:
dict.__delitem__(self, elem)
def __repr__(self):
if not self:
return '%s()' % self.__class__.__name__
items = ', '.join(map('%r: %r'.__mod__, self.most_common()))
return '%s({%s})' % (self.__class__.__name__, items)
# Multiset-style mathematical operations discussed in:
# Knuth TAOCP Volume II section 4.6.3 exercise 19
# and at http://en.wikipedia.org/wiki/Multiset
#
# Outputs guaranteed to only include positive counts.
#
# To strip negative and zero counts, add-in an empty counter:
# c += Counter()
def __add__(self, other):
'''Add counts from two counters.
>>> Counter('abbb') + Counter('bcc')
Counter({'b': 4, 'c': 2, 'a': 1})
'''
if not isinstance(other, Counter):
return NotImplemented
result = Counter()
for elem in set(self) | set(other):
newcount = self[elem] + other[elem]
if newcount > 0:
result[elem] = newcount
return result
def __sub__(self, other):
''' Subtract count, but keep only results with positive counts.
>>> Counter('abbbc') - Counter('bccd')
Counter({'b': 2, 'a': 1})
'''
if not isinstance(other, Counter):
return NotImplemented
result = Counter()
for elem in set(self) | set(other):
newcount = self[elem] - other[elem]
if newcount > 0:
result[elem] = newcount
return result
def __or__(self, other):
'''Union is the maximum of value in either of the input counters.
>>> Counter('abbb') | Counter('bcc')
Counter({'b': 3, 'c': 2, 'a': 1})
'''
if not isinstance(other, Counter):
return NotImplemented
result = Counter()
for elem in set(self) | set(other):
p, q = self[elem], other[elem]
newcount = q if p < q else p
if newcount > 0:
result[elem] = newcount
return result
def __and__(self, other):
''' Intersection is the minimum of corresponding counts.
>>> Counter('abbb') & Counter('bcc')
Counter({'b': 1})
'''
if not isinstance(other, Counter):
return NotImplemented
result = Counter()
if len(self) < len(other):
self, other = other, self
for elem in filter(self.__contains__, other):
p, q = self[elem], other[elem]
newcount = p if p < q else q
if newcount > 0:
result[elem] = newcount
return result
################################################################################
### UserDict
################################################################################
class UserDict(MutableMapping):
# Start by filling-out the abstract methods
def __init__(self, dict=None, **kwargs):
self.data = {}
if dict is not None:
self.update(dict)
if len(kwargs):
self.update(kwargs)
def __len__(self): return len(self.data)
def __getitem__(self, key):
if key in self.data:
return self.data[key]
if hasattr(self.__class__, "__missing__"):
return self.__class__.__missing__(self, key)
raise KeyError(key)
def __setitem__(self, key, item): self.data[key] = item
def __delitem__(self, key): del self.data[key]
def __iter__(self):
return iter(self.data)
# Modify __contains__ to work correctly when __missing__ is present
def __contains__(self, key):
return key in self.data
# Now, add the methods in dicts but not in MutableMapping
def __repr__(self): return repr(self.data)
def copy(self):
if self.__class__ is UserDict:
return UserDict(self.data.copy())
import copy
data = self.data
try:
self.data = {}
c = copy.copy(self)
finally:
self.data = data
c.update(self)
return c
@classmethod
def fromkeys(cls, iterable, value=None):
d = cls()
for key in iterable:
d[key] = value
return d
################################################################################
### UserList
################################################################################
class UserList(MutableSequence):
"""A more or less complete user-defined wrapper around list objects."""
def __init__(self, initlist=None):
self.data = []
if initlist is not None:
# XXX should this accept an arbitrary sequence?
if type(initlist) == type(self.data):
self.data[:] = initlist
elif isinstance(initlist, UserList):
self.data[:] = initlist.data[:]
else:
self.data = list(initlist)
def __repr__(self): return repr(self.data)
def __lt__(self, other): return self.data < self.__cast(other)
def __le__(self, other): return self.data <= self.__cast(other)
def __eq__(self, other): return self.data == self.__cast(other)
def __ne__(self, other): return self.data != self.__cast(other)
def __gt__(self, other): return self.data > self.__cast(other)
def __ge__(self, other): return self.data >= self.__cast(other)
def __cast(self, other):
return other.data if isinstance(other, UserList) else other
def __contains__(self, item): return item in self.data
def __len__(self): return len(self.data)
def __getitem__(self, i): return self.data[i]
def __setitem__(self, i, item): self.data[i] = item
def __delitem__(self, i): del self.data[i]
def __add__(self, other):
if isinstance(other, UserList):
return self.__class__(self.data + other.data)
elif isinstance(other, type(self.data)):
return self.__class__(self.data + other)
return self.__class__(self.data + list(other))
def __radd__(self, other):
if isinstance(other, UserList):
return self.__class__(other.data + self.data)
elif isinstance(other, type(self.data)):
return self.__class__(other + self.data)
return self.__class__(list(other) + self.data)
def __iadd__(self, other):
if isinstance(other, UserList):
self.data += other.data
elif isinstance(other, type(self.data)):
self.data += other
else:
self.data += list(other)
return self
def __mul__(self, n):
return self.__class__(self.data*n)
__rmul__ = __mul__
def __imul__(self, n):
self.data *= n
return self
def append(self, item): self.data.append(item)
def insert(self, i, item): self.data.insert(i, item)
def pop(self, i=-1): return self.data.pop(i)
def remove(self, item): self.data.remove(item)
def count(self, item): return self.data.count(item)
def index(self, item, *args): return self.data.index(item, *args)
def reverse(self): self.data.reverse()
def sort(self, *args, **kwds): self.data.sort(*args, **kwds)
def extend(self, other):
if isinstance(other, UserList):
self.data.extend(other.data)
else:
self.data.extend(other)
################################################################################
### UserString
################################################################################
class UserString(Sequence):
def __init__(self, seq):
if isinstance(seq, str):
self.data = seq
elif isinstance(seq, UserString):
self.data = seq.data[:]
else:
self.data = str(seq)
def __str__(self): return str(self.data)
def __repr__(self): return repr(self.data)
def __int__(self): return int(self.data)
def __float__(self): return float(self.data)
def __complex__(self): return complex(self.data)
def __hash__(self): return hash(self.data)
def __eq__(self, string):
if isinstance(string, UserString):
return self.data == string.data
return self.data == string
def __ne__(self, string):
if isinstance(string, UserString):
return self.data != string.data
return self.data != string
def __lt__(self, string):
if isinstance(string, UserString):
return self.data < string.data
return self.data < string
def __le__(self, string):
if isinstance(string, UserString):
return self.data <= string.data
return self.data <= string
def __gt__(self, string):
if isinstance(string, UserString):
return self.data > string.data
return self.data > string
def __ge__(self, string):
if isinstance(string, UserString):
return self.data >= string.data
return self.data >= string
def __contains__(self, char):
if isinstance(char, UserString):
char = char.data
return char in self.data
def __len__(self): return len(self.data)
def __getitem__(self, index): return self.__class__(self.data[index])
def __add__(self, other):
if isinstance(other, UserString):
return self.__class__(self.data + other.data)
elif isinstance(other, str):
return self.__class__(self.data + other)
return self.__class__(self.data + str(other))
def __radd__(self, other):
if isinstance(other, str):
return self.__class__(other + self.data)
return self.__class__(str(other) + self.data)
def __mul__(self, n):
return self.__class__(self.data*n)
__rmul__ = __mul__
def __mod__(self, args):
return self.__class__(self.data % args)
# the following methods are defined in alphabetical order:
def capitalize(self): return self.__class__(self.data.capitalize())
def center(self, width, *args):
return self.__class__(self.data.center(width, *args))
def count(self, sub, start=0, end=_sys.maxsize):
if isinstance(sub, UserString):
sub = sub.data
return self.data.count(sub, start, end)
def encode(self, encoding=None, errors=None): # XXX improve this?
if encoding:
if errors:
return self.__class__(self.data.encode(encoding, errors))
return self.__class__(self.data.encode(encoding))
return self.__class__(self.data.encode())
def endswith(self, suffix, start=0, end=_sys.maxsize):
return self.data.endswith(suffix, start, end)
def expandtabs(self, tabsize=8):
return self.__class__(self.data.expandtabs(tabsize))
def find(self, sub, start=0, end=_sys.maxsize):
if isinstance(sub, UserString):
sub = sub.data
return self.data.find(sub, start, end)
def format(self, *args, **kwds):
return self.data.format(*args, **kwds)
def index(self, sub, start=0, end=_sys.maxsize):
return self.data.index(sub, start, end)
def isalpha(self): return self.data.isalpha()
def isalnum(self): return self.data.isalnum()
def isdecimal(self): return self.data.isdecimal()
def isdigit(self): return self.data.isdigit()
def isidentifier(self): return self.data.isidentifier()
def islower(self): return self.data.islower()
def isnumeric(self): return self.data.isnumeric()
def isspace(self): return self.data.isspace()
def istitle(self): return self.data.istitle()
def isupper(self): return self.data.isupper()
def join(self, seq): return self.data.join(seq)
def ljust(self, width, *args):
return self.__class__(self.data.ljust(width, *args))
def lower(self): return self.__class__(self.data.lower())
def lstrip(self, chars=None): return self.__class__(self.data.lstrip(chars))
def partition(self, sep):
return self.data.partition(sep)
def replace(self, old, new, maxsplit=-1):
if isinstance(old, UserString):
old = old.data
if isinstance(new, UserString):
new = new.data
return self.__class__(self.data.replace(old, new, maxsplit))
def rfind(self, sub, start=0, end=_sys.maxsize):
if isinstance(sub, UserString):
sub = sub.data
return self.data.rfind(sub, start, end)
def rindex(self, sub, start=0, end=_sys.maxsize):
return self.data.rindex(sub, start, end)
def rjust(self, width, *args):
return self.__class__(self.data.rjust(width, *args))
def rpartition(self, sep):
return self.data.rpartition(sep)
def rstrip(self, chars=None):
return self.__class__(self.data.rstrip(chars))
def split(self, sep=None, maxsplit=-1):
return self.data.split(sep, maxsplit)
def rsplit(self, sep=None, maxsplit=-1):
return self.data.rsplit(sep, maxsplit)
def splitlines(self, keepends=0): return self.data.splitlines(keepends)
def startswith(self, prefix, start=0, end=_sys.maxsize):
return self.data.startswith(prefix, start, end)
def strip(self, chars=None): return self.__class__(self.data.strip(chars))
def swapcase(self): return self.__class__(self.data.swapcase())
def title(self): return self.__class__(self.data.title())
def translate(self, *args):
return self.__class__(self.data.translate(*args))
def upper(self): return self.__class__(self.data.upper())
def zfill(self, width): return self.__class__(self.data.zfill(width))
################################################################################
### Simple tests
################################################################################
if __name__ == '__main__':
# verify that instances can be pickled
from pickle import loads, dumps
Point = namedtuple('Point', 'x, y', True)
p = Point(x=10, y=20)
assert p == loads(dumps(p))
# test and demonstrate ability to override methods
class Point(namedtuple('Point', 'x y')):
__slots__ = ()
@property
def hypot(self):
return (self.x ** 2 + self.y ** 2) ** 0.5
def __str__(self):
return 'Point: x=%6.3f y=%6.3f hypot=%6.3f' % (self.x, self.y, self.hypot)
for p in Point(3, 4), Point(14, 5/7.):
print (p)
class Point(namedtuple('Point', 'x y')):
'Point class with optimized _make() and _replace() without error-checking'
__slots__ = ()
_make = classmethod(tuple.__new__)
def _replace(self, _map=map, **kwds):
return self._make(_map(kwds.get, ('x', 'y'), self))
print(Point(11, 22)._replace(x=100))
Point3D = namedtuple('Point3D', Point._fields + ('z',))
print(Point3D.__doc__)
import doctest
TestResults = namedtuple('TestResults', 'failed attempted')
print(TestResults(*doctest.testmod()))
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