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"""
Checks that only valid values are used in a mapping context.
"""
# pylint: disable=missing-docstring,invalid-name,too-few-public-methods
from __future__ import print_function
def test(**kwargs):
print(kwargs)
# dictionary value/comprehension
dict_value = dict(a=1, b=2, c=3)
dict_comp = {chr(x): x for x in range(256)}
test(**dict_value)
test(**dict_comp)
# in order to be used in kwargs custom mapping class should define
# __iter__(), __getitem__(key) and keys().
class CustomMapping(object):
def __init__(self):
self.data = dict(a=1, b=2, c=3, d=4, e=5)
def __iter__(self):
return iter(self.data)
def __getitem__(self, key):
return self.data[key]
def keys(self):
return self.data.keys()
test(**CustomMapping())
test(**CustomMapping) # [not-a-mapping]
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