Variable assignment with an if-else statement is not considered as branched

[nedbat]

Originally reported by Federico Carrá (Bitbucket: feferulo, GitHub: Unknown)

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Hello.
In my code I have a variable assignment with a if-else statement as this one:

#!python


variable = 1 if some_condition else -1

When doing coverage --with-branches, it does not consider that this has branches.

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• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/606

[nedbat]

Branch coverage can only measure branching from one line to another, since Python's trace facility currently only supports per-line tracing. 3.7 introduces opcode-level tracing, though coverage.py will need significant changes to make use of it.

[nedbat]

This would be a huge amount of work (how do you report on this?), but it's a reasonable feature idea.

[nedbat]

Original comment by Federico Carrá (Bitbucket: feferulo, GitHub: Unknown)

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Maybe you can enhance the original file replacing the if-else assignment with an expanded if-else block of code before running it through coverage (as if the variable assignment where syntactic sugar). It's beyond my comprehension the difficulty of such an "enhancement operator".

[ngie-eign]

This is a duplicate of #509.