python 2的Inspect模块中的签名方法

Question

I am trying to run a Python 3 library in Python 2. It uses inspect module and signature method which is not implemented in Python 2 version of the module.

signature = inspect.signature(initializer)

There is no implementation in __future__ that can help (at least, I haven't found one).

How can I replace this method?

Answer 1

Package funcsigs on PyPI is a backport of PEP-362 (which adds signature introspection) to Python 2.6+. So change the line in question to

import funcsigs
signature = funcsigs.signature(initializer)

Answer 2

inspect2 is backport of the entire Python 3.6 inspect module to Python 2.7. Like funcsigs it is also available from PyPI, and inspect2 is more recently maintained. (As I'm writing this, inspect2 was last updated in 2019, while funcsigs was last updated in 2016.)