eval to import a module

问题

I can't import a module using the eval() function.

So, I have a function where if I do import vfs_tests as v it works. However, the same import using eval() like eval('import vfs_tests as v') throws a syntax error.

Why is this so?

回答1:

Use exec:

exec 'import vfs_tests as v'

eval works only on expressions, import is a statement.

exec is a function in Python 3 : exec('import vfs_tests as v')

To import a module using a string you should use importlib module:

import importlib
mod = importlib.import_module('vfs_tests')

In Python 2.6 and earlier use __import__.

来源：https://stackoverflow.com/questions/17136772/eval-to-import-a-module