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[Jean-Paul Calderone <exarkun@xxxxxxxxxxxxxxxxx>]

Pyflakes can't be sure that `locals` refers to the builtin locals
function which returns the locals of the scope it is used in.  It could
have been overridden with another object which behaves differently.

Pyflakes could probably track the name and determine if it has been
overridden in a sensible way, but there's no way for it to tell if the
intended use is for the name to be injected externally somehow.

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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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