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class KeepContext:
"""
Context manager that receives a `django.template.Context` instance and a list of keys
Once the context manager is exited, it removes `keys` from the context, to avoid
side effects in later layout objects that may use the same context variables.
Layout objects should use `extra_context` to introduce context variables, never
touch context object themselves, that could introduce side effects.
"""
def __init__(self, context, keys):
self.context = context
self.keys = keys
def __enter__(self):
pass
def __exit__(self, type, value, traceback):
for key in list(self.keys):
if key in self.context:
del self.context[key]
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