TypeError: 'str' object is not callable (Python)

Question

Code:

import urllib2 as u
import os as o
inn = \'dword.txt\'
w = open(inn)
z = w.readline()
b = w.readline()
c = w.readline()
x = w.readline         


        

Answer 1

I got this warning from an incomplete method check:

if hasattr(w, 'to_json'):
    return w.to_json()
             ######### warning, 'str' object is not callable

It assumed w.to_json was a string. The solution was to add a callable() check:

if hasattr(w, 'to_json') and callable(w.to_json):

Then the warning went away.