Python - variable referenced before assignment

Question

The code I have is:

class New(Server):
    noOfCl = 0        

    def onConnect(self, socket):
        print "Client connected"
        print (noOfCl+=1)

I am receiving the following error: UnboundLocalError: local variable 'noOfCl' referenced before assignment. From what I understand, I'm declaring noOfCl before I am referencing it. Anyone have any ideas as to what I'm doing wrong? Thanks

This code does not throw the error you describe. It throws a plain NameError. — senderle
– senderle, Commented Apr 29, 2012 at 19:57

Abhijit · Accepted Answer · 2012-04-29 20:07:01Z

6

As noOfCl is a Class Variable you need to prefix the Class Name before it.

class New(Server):
    noOfCl = 0        

    def onConnect(self, socket):
        print "Client connected"
        New.noOfCl+=1
        print(New.noOfCl)

Also your in-place update when calling the print function/statement is not supported in Python.

edited Apr 29, 2012 at 20:07

answered Apr 29, 2012 at 19:54

Abhijit

64k20 gold badges143 silver badges209 bronze badges

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

2 Comments

San4ez Over a year ago

The parentheses after print are redundant

Abhijit Over a year ago

@San4ez: Depends whether its 3.x or 2.x. This will work irrespective of the Python's Version.

Collectives™ on Stack Overflow

Python - variable referenced before assignment

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related