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

• senderle: This code does not throw the error you describe. It throws a plain NameError.

Answer 1

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.

• San4ez: The parentheses after print are redundant
• Abhijit: @San4ez: Depends whether its 3.x or 2.x. This will work irrespective of the Python's Version.