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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,import-error,wrong-import-position,use-dict-literal
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:
def __init__(self):
self.data = dict(a=1, b=2, c=3, d=4, e=5)
def __getitem__(self, key):
return self.data[key]
def keys(self):
return self.data.keys()
test(**CustomMapping())
test(**CustomMapping) # [not-a-mapping]
class NotMapping:
pass
test(**NotMapping()) # [not-a-mapping]
# skip checks if statement is inside mixin/base/abstract class
class SomeMixin:
kwargs = None
def get_kwargs(self):
return self.kwargs
def run(self, **kwargs):
print(kwargs)
def dispatch(self):
kws = self.get_kwargs()
self.run(**kws)
class AbstractThing:
kwargs = None
def get_kwargs(self):
return self.kwargs
def run(self, **kwargs):
print(kwargs)
def dispatch(self):
kws = self.get_kwargs()
self.run(**kws)
class BaseThing:
kwargs = None
def get_kwargs(self):
return self.kwargs
def run(self, **kwargs):
print(kwargs)
def dispatch(self):
kws = self.get_kwargs()
self.run(**kws)
# abstract class
class Thing:
def get_kwargs(self):
raise NotImplementedError
def run(self, **kwargs):
print(kwargs)
def dispatch(self):
kwargs = self.get_kwargs()
self.run(**kwargs)
# skip uninferable instances
from some_missing_module import Mapping
class MyClass(Mapping):
pass
test(**MyClass())
class HasDynamicGetattr:
def __init__(self):
self._obj = {}
def __getattr__(self, attr):
return getattr(self._obj, attr)
test(**HasDynamicGetattr())
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