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[Bug 872503] Re: Pyflakes is unable to recognize string substitution as a use


Pyflakes' goal is to be useful.  It does not try to fit into any
particular formal mathematical framework.

Personally, I avoid the question of what pyflakes should do in this case
by not using locals() to interpolate into strings.  I don't find that
this constrains my ability to write programs easily.

I would say that injecting `locals` into a scope and expecting Pyflakes
to behave correctly in that case is more unreasonable than expecting
locals() interpolated into a string literal to mark the keys in the
string literal as used locals.  So, go ahead and submit a branch
implementing this feature.

You received this bug notification because you are a member of Divmod-
dev, which is the registrant for Pyflakes.

  Pyflakes is unable to recognize string substitution as a use

Status in Pyflakes:

Bug description:
  See attached program for a trivial example of a common idiom:

  "my special string %(with_a_variable)s"%locals()

  I wouldn't expect pyflakes to know how to deal with an arbitrary
  dictionary in the right hand position, but the use of locals() means
  that certain variables are actually used!

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