UnboundLocalError: local variable 'checking' referenced before assignment

Question

I have problem which cannot fix. I get the error

UnboundLocalError: local variable 'checking' referenced before assignment

My code

    def volume_checker_first_stage(volume1,volume2,withdraw_minimun):
      if volume1>volume2:
       quantity = volume2
       if quantity > withdraw_minimun:
            checking = True
       return quantity, checking
      elif volume2>volume1:
       quantity = volume1
       if quantity > withdraw_minimun:
              checking = True
       return quantity, checking
      else:
       return None,None

Answer 1

将checking初始化为False作为函数的第一行以避免此错误。

Answer 2

As the first line of the body of your function, code this:

checking = False

You have a return statement that returns the value of checking , but your code doesn't always set it. Referenced before assignment means your return statement asked for the value of the variable before your code assigned it.