mirror of
https://github.com/python/cpython
synced 2024-09-24 09:09:08 +00:00
e99d5ea25b
added test script and expected output file as well this closes patch 103297. __all__ attributes will be added to other modules without first submitting a patch, just adding the necessary line to the test script to verify more-or-less correct implementation.
36 lines
1,000 B
Python
36 lines
1,000 B
Python
"""Helper to provide extensibility for pickle/cPickle.
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This is only useful to add pickle support for extension types defined in
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C, not for instances of user-defined classes.
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"""
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from types import ClassType as _ClassType
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__all__ = ["pickle","constructor"]
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dispatch_table = {}
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safe_constructors = {}
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def pickle(ob_type, pickle_function, constructor_ob=None):
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if type(ob_type) is _ClassType:
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raise TypeError("copy_reg is not intended for use with classes")
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if not callable(pickle_function):
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raise TypeError("reduction functions must be callable")
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dispatch_table[ob_type] = pickle_function
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if constructor_ob is not None:
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constructor(constructor_ob)
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def constructor(object):
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if not callable(object):
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raise TypeError("constructors must be callable")
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safe_constructors[object] = 1
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# Example: provide pickling support for complex numbers.
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def pickle_complex(c):
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return complex, (c.real, c.imag)
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pickle(type(1j), pickle_complex, complex)
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