Re: How to `eval` code with `def`?

[MRAB]

On 2017-05-29 02:03, Peng Yu wrote:

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

'eval' expects an expression, e.g. "1 + 2", not statements.

What you should be using instead is 'exec'.
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