How to `eval` code with `def`?

[Peng Yu]

Hi,

I got the following error when I try to eval the following code with
def. Does anybody know what is the correct way to evaluation python
code that contains `def`? Thanks.

$ cat ./main.py
#!/usr/bin/env python
# vim: set noexpandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8:

import dis
s = """
def f(x):
    return x is not None
"""
print(s)
eval(s)
$ ./main.py

def f(x):
    return x is not None

Traceback (most recent call last):
  File "./main.py", line 10, in <module>
    eval(s)
  File "<string>", line 2
    def f(x):
      ^
SyntaxError: invalid syntax

-- 
Regards,
Peng