未绑定的本地错误:在分配之前引用?

时间:2018-06-08 18:34:35

标签: python-3.x

import turtle

ben = turtle.Turtle()
W = 1
ben.speed(10.5)
ben.width(5)
#X = 0
O = 0



if GRIDDONE == True: #inside lines
    ben.speed(10.5)
    ben.forward(100)
    ben.right(90)
    ben.forward(300)
    ben.left(90)
    ben.forward(100)
    ben.left(90)
    ben.forward(300)
    ben.right(90)
    ben.forward(100)
    ben.right(90)
    ben.forward(100)
    ben.right(90)
    ben.forward(300)
    ben.left(90)
    ben.forward(100)
    ben.left(90)
    ben.forward(300)

ben.pu()
ben.forward(500)

X = turtle.Turtle()
O = turtle.Turtle()
X.pu()
O.pu()

X.forward(300)
X.right(90)
O.forward(300)
O.right(90)

X.color("Blue")
X.color()
O.color("Red")
O.color()
X.width(2)
O.width(2)
#X.speed(100)
#O.speed(100)

SQ1 = False


StartX = '300'
StaryY = '0'


def playX():
    P1 = input('Can player X please choose their square')

    if (P1) == ('1'):
        if (SQ1) == False:
            X.right(90)
            X.forward(300) #change this
            X.left(90)
            X.left(45)
            X.pd()
            X.forward(140)
            X.pu()
            X.left(135)
            X.forward(100)
            X.left(135)
            X.pd()
            X.forward(140)
            X.pu()
            X.setx(300)
            X.sety(0)
            X.left(45)
            SQ1 = True




def playO():
    P1 = input('Can player O please choose their square')

    if P1 == ('1'):
        if SQ1 == False:
            O.right(90)
            O.forward(300) #change this
            O.left(90)
            O.forward(50)
            O.left(90)
            O.forward(10)
            O.left(90)
            O.pd()
            O.circle(-40)
            O.pu()
            O.setx(300)
            O.sety(0)
            O.left(180)
            SQ1 = True


playO()
#playX()

这是我的代码,我需要创建一个不允许乌龟在相同的情况下绘制的功能,如果'功能两次,但我得到标题中的错误。错误如下:

追踪(最近一次通话): 文件" C:\ Users \ benna \ Downloads \ 2.py",第314行,in playO() 文件" C:\ Users \ benna \ Downloads \ 2.py",第297行,在playO中 如果SQ1 == False: UnboundLocalError:局部变量' SQ1'在分配前引用

我认为这是因为在函数中使用变量时无法对其进行编辑。

1 个答案:

答案 0 :(得分:0)

错误是由于SQ1在全局空间中声明,然后在play0()函数内被访问。

您可以使用关键字global来修复此错误。在play0()函数中添加一行,指定SQ1是全局的,如下所示(参见第2行):

def playO():
    global SQ1

    P1 = input('Can player O please choose their square')

    if P1 == ('1'):
        if SQ1 == False:

进一步改进:

我建议您关注变量名Python Style Guide并提高代码的可读性。