Failure to parse string templates with similar quotes

[andrewvaughan]

Failure to parse string templates with similar quotes

[andrewvaughan]

I have also tested that nested template strings work, but only if all nested templates have opposite quote styles:

cmd.append(f"--add-header {pipes.quote(f'User-Agent:{browser['user-agent']}')}")

I was somewhat expecting this to be an "unsolvable" situation, but it did parse correctly when all internal quotes were single-quotes (') if the parent template was double-quotes (").

[JelleZijlstra]

Duplicate of #3746

[andrewvaughan]

Duplicate of #3746

Ah, thanks. Did a cursory search but didn't see it - I'm still getting into the habit of checking pins and not going straight to search.

[JelleZijlstra]

And just to explain the behavior you're seeing: Black's parser currently treats f-strings just like normal strings, treating whatever is inside as just a string literal. Your cmd.append(f"--add-header {pipes.quote(f'User-Agent:{browser['user-agent']}')}") is accepted because Black just ignores whatever happens until it sees the closing double quote.