mirror of
https://github.com/python/cpython.git
synced 2025-11-03 23:21:29 +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.
35 lines
1,000 B
Python
35 lines
1,000 B
Python
"""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
|
|
|
|
__all__ = ["pickle","constructor"]
|
|
|
|
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)
|