How can I get the source code of a Python function?

Question

Suppose I have a Python function as defined below:

def foo(arg1,arg2):
    #do something with args
    a = arg1 + arg2
    return a

I can g

Answer 1

dis is your friend if the source code is not available:

>>> import dis
>>> def foo(arg1,arg2):
...     #do something with args
...     a = arg1 + arg2
...     return a
...
>>> dis.dis(foo)
  3           0 LOAD_FAST                0 (arg1)
              3 LOAD_FAST                1 (arg2)
              6 BINARY_ADD
              7 STORE_FAST               2 (a)

  4          10 LOAD_FAST                2 (a)
             13 RETURN_VALUE