Python version issue when using types.FunctionType

Question

I have a problem with code snippet founded on https://stackoverflow.com/a/10303539/4113228

When I try to compile:

import types
dynf = types.FunctionType(compile('print("wow")', 'dyn.py', 'exec'), {})
dynf()

in file test.py using python2.7, everything working fine, but when I try with python3.5 I get:

Traceback (most recent call last):
  File "test.py", line 3, in <module>
    dynf()
  File "dyn.py", line 1, in <module>
NameError: name 'print' is not defined

I'm new in python coding and I completly get stuck at this.. Many thanks for any help!

Aran-Fey · Accepted Answer · 2017-11-14 21:23:09Z

3

The problem is that you're passing an empty dict as globals - because of this, the compiled code can't access global variables or builtins.

To allow access to builtin functions, use

import builtins
dynf = types.FunctionType(compile('print("wow")', 'dyn.py', 'exec'), {'__builtins__':builtins})

edited Nov 14, 2017 at 21:23

answered Jun 4, 2017 at 16:29

Aran-Fey

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