Variable assignment in an f-string [duplicate]

Question

Question question regarding f-strings and expressions in Python 3.

The Python documentation states clearly that:

Formatted string literals (also called f-strings for short) let you include the value of Python expressions inside a string by prefixing the string with f or F and writing expressions as {expression}.

A valid expression is: {A = "A"} but this doesn't work:

>>> print(f'{A = "A"} {A}')
    File "main.py", line 3
    print(f'{A = "A"} {A}')
          ^
SyntaxError: f-string: expecting '}'

What am I doing wrong here? My expression is valid. I'm sure I'm misunderstanding the documentation so if someone can clarify it would be a great help.

Thanks.

"A valid expression is: {A = "A"} [...] My expression is valid." assignment is not a valid python expression. — Masklinn
– Masklinn, Commented Dec 27, 2023 at 16:05
@Masklinn You're correct. Thank you. I was frantically googling around and come across this: codepict.com/expressions-and-statements-in-python Which wrongfully states: "So, the first combination x = 5 is an expression" — the_slug
– the_slug, Commented Dec 27, 2023 at 16:09
@DavisHerring Yes that helps, thank you. Does the Python documentation have a list of what does and does not constitute an expression? Each language seems to define what is and isn't one differently and it's causing me a real headache. — the_slug
– the_slug, Commented Dec 27, 2023 at 16:11
@the_slug: Of course it does—it’s a bit technical, of course, since it’s a reference rather than a tutorial, but anything’s better than the nonsense you found! — Davis Herring
– Davis Herring, Commented Dec 27, 2023 at 16:14

Paul · Accepted Answer · 2023-12-27 16:04:31Z

0

You probably want to do this: print(f'A = {A}')

answered Dec 27, 2023 at 16:04

Paul

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