[issue43227] Backslashes in function arguments in f-string expressions

[Eric V. Smith]

Change by Eric V. Smith :


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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue43227] Backslashes in function arguments in f-string expressions

[Eric V. Smith]

Eric V. Smith  added the comment:

Yes, they're prohibited anywhere inside of the braces {}.

This might be relaxed in the future, but through 3.9 it's still enforced.

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[issue43227] Backslashes in function arguments in f-string expressions

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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nosy: +eric.smith

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[issue43227] Backslashes in function arguments in f-string expressions

[Thomas Nabelek]

New submission from Thomas Nabelek :

>From https://www.python.org/dev/peps/pep-0498/#escape-sequences:
"Backslashes may not appear inside the expression portions of f-strings"

Is this supposed to be true even for arguments to functions inside of the 
expression?

my_str = "test\ test\ test"
path = f"{my_str.replace(r'\ ', ' ')}"

gives

my_str = "test\ test\ test"
path = f"{my_str.replace(r'\ ', ' ')}"

SyntaxError: f-string expression part cannot include a backslash

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messages: 386978
nosy: nabelekt
priority: normal
severity: normal
status: open
title: Backslashes in function arguments in f-string expressions
type: behavior
versions: Python 3.9

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