[Fixed] Using global variables in a python function

Question (Issue)

How do I create or use a global variable inside a function?

How do I use a global variable that was defined in one function inside other functions?

Now we will see Solution for issue: Using global variables in a function

Answer (solution)

You can use a global variable within other functions by declaring it as global within each function that assigns a value to it:

globvar = 0

def set_globvar_to_one():
    global globvar    # Needed to modify global copy of globvar
    globvar = 1

def print_globvar():
    print(globvar)     # No need for global declaration to read value of globvar

print_globvar()       # Prints 1

Since it’s unclear whether globvar = 1 is creating a local variable or changing a global variable, Python defaults to creating a local variable, and makes you explicitly choose the other behavior with the global keyword.

See other answers if you want to share a global variable across modules.

This question is answered By – Paul Stephenson

This answer is collected from stackoverflow and reviewed by FixPython community admins, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0