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from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.helpers.wrap_matcher import is_matchable_type
__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"
import types
class IsInstanceOf(BaseMatcher):
def __init__(self, expected_type):
if not is_matchable_type(expected_type):
raise TypeError('IsInstanceOf requires type or a tuple of classes and types')
self.expected_type = expected_type
def _matches(self, item):
return isinstance(item, self.expected_type)
def describe_to(self, description):
try:
type_description = self.expected_type.__name__
except AttributeError:
type_description = "one of %s" % ",".join(str(e) for e in self.expected_type)
description.append_text('an instance of ') \
.append_text(type_description)
def instance_of(atype):
"""Matches if object is an instance of, or inherits from, a given type.
:param atype: The type to compare against as the expected type or a tuple
of types.
This matcher checks whether the evaluated object is an instance of
``atype`` or an instance of any class that inherits from ``atype``.
Example::
instance_of(str)
"""
return IsInstanceOf(atype)