How to determine if the variable is a function in Python?

You may use inspect.isfunction(object). See: docs.python.org

That said, you should avoid using this technique in your day-to-day code. Sometimes you actually need to use reflection - for example, an MVC framework might need to load a class and inspect its members. But usually you should return/pass/deal with objects that have the same "interface". For example, do not return an object that may be an integer or a function - always return the same "type" of object so your code can be consistent.

There is a callable function in python.

 if callable(boda):

Use callable(boda) to determine whether boda is callable or not.

Callable means here being a function, method or even a class. But since you want to distinguish only between variables and functions it should work nicely.

Your code would then look like:

boda = len   # boda is the length function now
if callable(boda):
  print "Boda is a function!"
else:
  print "Boda is not a function!"

>>> import types
>>> def f(): pass
...
>>> x = 0
>>> type(f) == types.FunctionType
True
>>> type(x) == types.FunctionType
False

That will check if it's a function. callable() will check if it's callable (that is, it has a __call__ method), so it will return true on a class as well as a function or method.