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 set_globvar_to_one() print_globvar() # Prints 1
I imagine the reason for it is that, since global variables are so dangerous, Python wants to make sure that you really know that's what you're playing with by explicitly requiring the
See other answers if you want to share a global variable across modules.