Showing content from http://svn.python.org/projects/python/branches/release20-maint/Lib/copy_reg.py below:
"""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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