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from pypy.interpreter.error import OperationError
def missing(space, w_self, w_key):
# An interp-level version of this method. This is mostly only
# useful because it can be executed atomically in the presence of
# threads.
w_default_factory = space.getattr(w_self, space.newtext('default_factory'))
if space.is_w(w_default_factory, space.w_None):
raise OperationError(space.w_KeyError, space.newtuple([w_key]))
w_value = space.call_function(w_default_factory)
space.setitem(w_self, w_key, w_value)
return w_value
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