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I've found a rather simple bug in the default CPython implementation on Mac OS X 10.9.5
1) Create a new .py file containing:
def a():
 print q
x=5
2) Open Python and run using execfile() then a(). Receive error as expected:
 File "test.py", line 2, in a
 print q
NameError: global name 'q' is not defined
3) Edit file so that "print q" is not "print x", and save.
4) Run a() (Do not use execfile!)
5) Error:
 File "test.py", line 2, in a
 print x
NameError: global name 'q' is not defined
EXPECTED: Traceback should say "print q" NOT "print x". It is reading from the file. Actually, the error in the file has been corrected-- it is the copy of the program in memory that is faulty.
Python 2.7.5 (default, Mar 9 2014, 22:15:05)
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin