[issue39079] help() modifies the string module

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

I *can* reproduce, on macOS 10.14.6, Python 2.7.17 (from macports).

Python 2.7.17 (default, Oct 20 2019, 14:46:50) 
[GCC 4.2.1 Compatible Apple LLVM 10.0.1 (clang-1001.0.46.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import string
>>> string.letters
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> help(int)  # brings up pager; page through to the end

>>> string.letters
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'

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nosy: +mark.dickinson

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<https://bugs.python.org/issue39079>
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