Parse External Methods Calls Within Python Function?

Question

Given the python code:

import sys
import os 

def MyPythonMethod(value1, value2):
    # defining some variables 
    a = 4
    myValue = 15.65
    listValues = [4, 67, 83, -23]

    # check if a file exists
    if ( os.path.exists('/home/hello/myfile.txt') ):
        pass

    # doing some operation on the list
    listValues[0] = listValues[1]       

    # check if a file exists
    print sys.path

    # looping through the values
    for i in listValues:
        print i

How can I extract the names of all external methods in function MyPythonMethod?

Ideally, I'd like to get a list of all external methods/members that are being invoked.

For MyPythonMethod, this will return:

moduleNames = ["os", "sys"]

methodsInvoked = ["os.path.exists", "sys.path"]

(yes, I know that 'path' is a member of sys, not a method; but I think you get the idea).

Any ideas?

I'd like to find things like ["os.path.exists", "sys.path"]. How will you solution help in doing so? — user3262424
– user3262424, Commented May 13, 2011 at 11:52
@user540009: Are you saying the phrase "all external methods" really means "functions defined outside my code"? Is that what you're searching for? — S.Lott
– S.Lott, Commented May 13, 2011 at 12:32

S.Lott · Accepted Answer · 2011-05-13 10:04:42Z

1

You can't ever fully know what functions (and in your case we're talking about plain functions, not methods, since methods are member functions of a class), a function will call without parsing it, because it might do so dynamically and their names may depend on what is imported into the global namespace when the function gets called.

But you can see the module and function names that are referenced by a function by inspecting MyPythonMethod.func_code.co_names. In your case, this attribute would return the tuple ('os', 'path', 'exists', 'sys').

edited May 13, 2011 at 10:04

S.Lott

393k83 gold badges521 silver badges791 bronze badges

answered May 13, 2011 at 3:29

Boaz Yaniv

6,43423 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

user3262424 Over a year ago

Thank you Boaz. Can you tell me what else can be retrieved using func_code? what other info can it give on the function?

Boaz Yaniv Over a year ago

You can try dir(MyPythonMethod.func_code) and see for yourself. You can get the name of the variables in the function, the consts (literals) defined in there and so on.

user3262424 Over a year ago

Great Boaz. Thanks & Shabbat Shalom!

Collectives™ on Stack Overflow

Parse External Methods Calls Within Python Function?

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related