[FIXED] How to dynamically import modules with exec

Issue

Now I want to built a function get_doc( ) which can get the doc of the module Here's the code

def get_doc(module):
    exec "import module"
    print module.__doc__

And the information returned:

Traceback (most recent call last):
  File "<pyshell#36>", line 1, in <module>
    get_doc(sys)
NameError: name 'sys' is not defined

Solution

The problem is you're importing "module" instead of the specified module, and you didn't put the name module anywhere. A stupid fix to this would be to always using exec

def get_doc(module):
    exec "import {}".format(module)
    exec "print {}.__doc__".format(module)"

But instead of exec, i would advise you to use the __import__ function:

def get_doc(module):
    module = __import__(module)
    print module.__doc__

Which allows more flexibility, and you can modify, use module as you wanted.

Answered By - aIKid

Answer Checked By - Cary Denson (PHPFixing Admin)