[issue40194] Document special meanings of a single underscore

[cripitone]

New submission from cripitone :

The official documentation doesn't seem to cover the various meanings/uses of 
the single underscore "_", in different contexts (not just the interactive 
interpreter).

See for example:

https://www.datacamp.com/community/tutorials/role-underscore-python

--
assignee: docs@python
components: Documentation
messages: 365814
nosy: cripitone, docs@python
priority: normal
severity: normal
status: open
title: Document special meanings of a single underscore
type: enhancement

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[issue40194] Document special meanings of a single underscore

[cripitone]

cripitone  added the comment:

> Various meanings are documented in appropriate sections

Uhm, you're right, though some of them are not that easy to find using the 
searchbar in the doc website, for example the meaning of "_" in 
https://docs.python.org/3.7/tutorial/introduction.html

Maybe it would help adding "(a single underscore)" at the end of the sentence 
"In interactive mode, the last printed expression is assigned to the variable 
_". This way one would get it by searching for "single underscore" or even 
"underscore".
(and maybe it could also be mentioned in 
https://docs.python.org/3.7/tutorial/interpreter.html and/or 
https://docs.python.org/3.7/tutorial/appendix.html which deal specifically with 
the interactive interpreter)

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