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import sys
IS_PY35 = sys.version_info >= (3, 5)
def empty():
"""
>>> empty()
{}
"""
d = {}
return d
def keyvalue(key, value):
"""
>>> keyvalue(1, 2)
{1: 2}
"""
d = {key:value}
return d
def keyvalues(key1, value1, key2, value2):
"""
>>> sorted(keyvalues(1, 2, 3, 4).items())
[(1, 2), (3, 4)]
"""
d = {key1:value1, key2:value2}
return d
def keyvalues2(key1, value1, key2, value2):
"""
>>> sorted(keyvalues2(1, 2, 3, 4).items())
[(1, 2), (3, 4)]
"""
d = {key1:value1, key2:value2,}
return d
def constant():
"""
>>> len(constant())
2
>>> print(constant()['parrot'])
resting
>>> print(constant()['answer'])
42
"""
d = {u"parrot":u"resting", u"answer":42}
return d
def dict_call():
"""
>>> print(dict_call()['parrot'])
resting
>>> print(dict_call()['answer'])
42
"""
d = dict(parrot=u"resting", answer=42)
return d
def dict_call_dict():
"""
>>> print(dict_call_dict()['parrot'])
resting
>>> print(dict_call_dict()['answer'])
42
"""
d = dict(dict(parrot=u"resting", answer=42))
return d
def dict_call_kwargs():
"""
>>> print(dict_call_kwargs()['parrot1'])
resting
>>> print(dict_call_kwargs()['parrot2'])
resting
>>> print(dict_call_kwargs()['answer1'])
42
>>> print(dict_call_kwargs()['answer2'])
42
"""
kwargs = dict(parrot1=u"resting", answer1=42)
d = dict(parrot2=u"resting", answer2=42, **kwargs)
return d
def items_of_dict_call():
"""
>>> items_of_dict_call()
[('answer1', 42), ('answer2', 42), ('parrot1', 'resting'), ('parrot2', 'resting')]
"""
kwargs = dict(parrot1="resting", answer1=42)
items = dict(kwargs.items(), parrot2="resting", answer2=42, **kwargs).items()
return sorted(items)
def item_creation_sideeffect(L, sideeffect, unhashable):
"""
>>> def sideeffect(x):
... L.append(x)
... return x
>>> def unhashable(x):
... L.append(x)
... return [x]
>>> L = []
>>> item_creation_sideeffect(L, sideeffect, unhashable) # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...unhashable...
>>> L
[2, 4]
>>> L = []
>>> {1:2, sideeffect(2): 3, 3: 4, unhashable(4): 5, sideeffect(5): 6} # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...unhashable...
>>> L if IS_PY35 else (L + [5])
[2, 4, 5]
"""
return {1:2, sideeffect(2): 3, 3: 4, unhashable(4): 5, sideeffect(5): 6}
def dict_unpacking_not_for_arg_create_a_copy():
"""
>>> dict_unpacking_not_for_arg_create_a_copy()
[('a', 'modified'), ('b', 'original')]
[('a', 'original'), ('b', 'original')]
"""
data = {'a': 'original', 'b': 'original'}
func = lambda: {**data}
call_once = func()
call_once['a'] = 'modified'
call_twice = func()
print(sorted(call_once.items()))
print(sorted(call_twice.items()))
def from_keys_bound(dict d, val):
"""
https://github.com/cython/cython/issues/5051
Optimization of bound method calls was breaking classmethods
>>> sorted(from_keys_bound({}, 100).items())
[('a', 100), ('b', 100)]
>>> sorted(from_keys_bound({}, None).items())
[('a', None), ('b', None)]
"""
if val is not None:
return d.fromkeys(("a", "b"), val)
else:
return d.fromkeys(("a", "b"))
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