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[Andrew Schein <872503@xxxxxxxxxxxxxxxxxx>]

Is Pyflakes goal to be correct every time it points out an error?  Or to
not miss errors within predefined categories?

In the current behavior, Pyflakes flags "used" variables as "unused".  If the user replaces locals() with their own function definition they will not get an error.  Assuming that locals() refers to the builtin will produce a "sound" error-finder as defined
http://en.wikipedia.org/wiki/Soundness

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https://bugs.launchpad.net/bugs/872503

Title:
  Pyflakes is unable to recognize string substitution as a use

Status in Pyflakes:
  New

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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