[issue39800] Inconsistent/incomplete disassembly of methods vs method source code

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

> BTW how else are methods/functions are created in Python except via def?

Functions are objects like everything else in Python, so they have a 
type, which has a constructor:

    from types import FunctionType

The documentation for FunctionType is a bit thin, so you may need to 
experiment a bit to get the details right, but it can be done.

Unfortunately copy.copy doesn't actually copy functions, which is in my 
opinion a bug (see #39805) but if you search the internet, you will find 
code that makes independent copies of function objects.

Methods are different from functions, and like functions, they 
too have a type with a constructor:

    from types import MethodType

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39800>
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