Python function definition global parameter

Question

Can someone explain why the gloabl variable x & y are not recognized in printfunc,

code.py

global x
global y

def test(val_x=None,val_y=None)
    x = val_x
    y = val_y
    printfunc()

def printfunc():
   print('x',x)
   print('y',y)

if __name__ = '__main__':
   test(val_x=1,val_y=2)

BenMorel · Accepted Answer · 2013-11-24 16:23:46Z

2

place the global inside test().

global is used inside functions so that we can change global variables or create variables that are added to the global namespace. :

   def test(val_x=None,val_y=None):
        global x
        global y
        x = val_x
        y = val_y
        printfunc()

edited Nov 24, 2013 at 16:23

BenMorel

37.1k53 gold badges208 silver badges339 bronze badges

answered Oct 4, 2012 at 16:38

Ashwini Chaudhary

252k60 gold badges478 silver badges519 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Anton Guryanov · Accepted Answer · 2012-10-04 16:43:47Z

0

The global keyword is used inside code block to specify, that declared variables are global, not local. So move global inside your functions

def test(val_x=None,val_y=None): #you also forgot ':' here
  global x, y
  x = val_x
  y = val_y
  printfunc()

def printfunc():
  global x, y
  print('x',x)
  print('y',y)

answered Oct 4, 2012 at 16:43

Anton Guryanov

12.5k1 gold badge18 silver badges17 bronze badges

2 Comments

glglgl Over a year ago

global should not be needed in printfunc(), as they are not assigned there.

Anton Guryanov Over a year ago

They are not necessary, but if you write this, you can easily see, that these variables are global

Collectives™ on Stack Overflow

Python function definition global parameter

2 Answers 2

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related