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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 1f6982a96ffc3e1315214550e0fbf160f45b09a6 authored by Fred Drake on 08 May 2001, 19:02:27 UTC, committed by Fred Drake on 08 May 2001, 19:02:27 UTC 
Fix the version information to reflect that this is the maintenance
 
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Tip revision: 1f6982a96ffc3e1315214550e0fbf160f45b09a6 authored by Fred Drake on 08 May 2001, 19:02:27 UTC
Fix the version information to reflect that this is the maintenance
Tip revision: 1f6982a
copy_reg.py 
"""Helper to provide extensibility for pickle/cPickle.

This is only useful to add pickle support for extension types defined in
C, not for instances of user-defined classes.
"""

from types import ClassType as _ClassType

dispatch_table = {}
safe_constructors = {}

def pickle(ob_type, pickle_function, constructor_ob=None):
    if type(ob_type) is _ClassType:
        raise TypeError("copy_reg is not intended for use with classes")

    if not callable(pickle_function):
        raise TypeError("reduction functions must be callable")
    dispatch_table[ob_type] = pickle_function

    if constructor_ob is not None:
        constructor(constructor_ob)

def constructor(object):
    if not callable(object):
        raise TypeError("constructors must be callable")
    safe_constructors[object] = 1

# Example: provide pickling support for complex numbers.

def pickle_complex(c):
    return complex, (c.real, c.imag)

pickle(type(1j), pickle_complex, complex)
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