STINNER Victor <[email protected]> added the comment:
The pickle module doesn't copy a type but gets it from its module. The Python
implementation is pickle._Pickler.save_type() which calls
pickle._Pickler.save_global().
The cloudpickle module doesn't copy types neither: same behavior than pickle.
Example:
---
import pickle
import pickletools
class A:
pass
data = pickle.dumps(A)
pickletools.dis(data)
---
Output:
---
0: \x80 PROTO 4
2: \x95 FRAME 18
11: \x8c SHORT_BINUNICODE '__main__'
21: \x94 MEMOIZE (as 0)
22: \x8c SHORT_BINUNICODE 'A'
25: \x94 MEMOIZE (as 1)
26: \x93 STACK_GLOBAL
27: \x94 MEMOIZE (as 2)
28: . STOP
highest protocol among opcodes = 4
---
In short, it's implemented as:
getattr(__import__('__main__'), 'A')
----------
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<https://bugs.python.org/issue47143>
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