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pythonvariables

Says I haven't declared, even though I clearly have

The Error is called: UnboundLocalError: local variable 'P' referenced before assignment. I want it so I can change the Pen Width with K and L, but it won't let me. Can you help me?

from gturtle import*
keyK = 75
keyL = 76
P = 10

def colorKeys(key):
if key == keyK:
    P = P - 2
elif key == keyL:
    P = P + 2

makeTurtle(keyPressed = colorKeys)
hideTurtle()

while True:
    setPenWidth(P)
Solution

  • If you really want to use global variable in function, you can do this:

    def colorKeys(key):
  global P
  if key == keyK:
      P = P - 2
  elif key == keyL:
      P = P + 2

    But generally it is a bad idea.