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import contextlib
import os
import sys
import random
import string
class ImportKiller(object):
"Context manager to make an import of a given name or names fail."
def __init__(self, *names):
self.names = names
def find_module(self, fullname, path=None):
if fullname in self.names:
return self
def load_module(self, fullname):
assert fullname in self.names
raise ImportError(fullname)
def __enter__(self):
self.original = {}
for name in self.names:
self.original[name] = sys.modules.pop(name, None)
sys.meta_path.insert(0, self)
def __exit__(self, *args):
sys.meta_path.remove(self)
for key, value in self.original.items():
if value is not None:
sys.modules[key] = value
@contextlib.contextmanager
def NoNoneDictMutator(destination, **changes):
"""Helper context manager to make and unmake changes to a dict.
A None is not a valid value for the destination, and so means that the
associated name should be removed."""
original = {}
for key, value in changes.items():
original[key] = destination.get(key)
if value is None:
if key in destination:
del destination[key]
else:
destination[key] = value
yield
for key, value in original.items():
if value is None:
if key in destination:
del destination[key]
else:
destination[key] = value
def Environ(**changes):
"""A context manager to temporarily change the os.environ"""
return NoNoneDictMutator(os.environ, **changes)
ALPHABET = string.ascii_letters + string.digits
def random_string(k, source=ALPHABET):
"""Generate a random string with length <i>k</i>
"""
result = ''
for i in range(0, k):
result += random.choice(source)
return result
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