Question

I have searched through similar questions on here, and cannot find an exact answer. I keep getting a “…referenced before assignment” error.

I am trying to put two graphics objects returned from one function into two variables in another function.

I had basically the exact same piece of code in an earlier version, and it worked just fine.

I have the piece of code:

if moveE:
    moved_ctr, nT = MoveCharacter(ctr, spaceSize, borderSet, "east")
if moveW:
    moved_ctr, nT = MoveCharacter(ctr, spaceSize, borderSet, "west")
moved_ctr.draw(board)

This is what MoveCharacter() looks like:

def MoveCharacter(character, spSz, bdSet, direction):
    x1 = character.getCenter().getX()
    x2 = bdSet
    y1 = character.getCenter().getY()
    y2 = bdSet
    notifyText = Text(Point(100, 100), "")

    character.undraw()

    distance = math.sqrt((x2 - x1)**2 + (y2 - y1)**2)

    if direction == "east":
            if distance < spSz:
                    character.move(spSz, 0)
            else:
                    notifyText.setText("You cannot move right from where you currently are.")
    if direction == "west":
            if distance > spSz:
                    character.move(-1 * spSz, 0)
            else:
                    notifyText.setText("You cannot move left from where you currently are.")

    return character, notifyText

And I keep getting the error:

Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    Grid()
  File "<pyshell#24>", line 70, in Grid
    moved_ctr.draw(board)
UnboundLocalError: local variable 'moved_ctr' referenced before assignment

Answer 1

What happens before if moveE:?

Most likely, moveE and moveW are falsey.