在为全局变量赋值之前引用的局部变量'delete'

我已经在项目开始时设置了一个全局变量删除，位于导入的库之下和任何类之前，但是当我有这样的代码时：在为全局变量赋值之前引用的局部变量'delete'

def motion_notify_callback(event): 
     if (ispymol == True): 

      if event.inaxes is ax:  
      x = event.xdata 
      y = event.ydata 
      x = round(x,0) 
      y = round(y,0) 
      x = int(x) 
      y = int(y) 
      coord = (x,y) 


      for i in range(0,len(number_list)): 

       if (coord == number_list[i]): 
       if (delete == True): 
        pymol.cmd.do("delete CurrentCont") 
        delete = False 
       pymol.cmd.do("distance CurrentCont, chain"+lc+" and resi "+resi1[i]+" and name CA, chain"+lc+" and resi "+resi2[i]+" and name CA") 

        delete = True 

      for i in range(0,len(rres)): 
      if (coord == mappingpredcont[i]): 
       if (delete == True): 
         pymol.cmd.do("delete CurrentCont") 
         delete =False 
       pymol.cmd.do("distance CurrentCont, chain"+lc+" and resi "+predresi1[i]+" and name CA, chain"+lc+" and resi "+predresi2[i]+" and name CA") 

        delete = True

在赋值给全局变量之前引用了错误局部变量'delete' 我在哪里出错了？

来源

2013-04-26 miik

你必须在你想使用它的每个函数中定义'global'（提醒你在所有使用情况中大于99％都是错误的编码风格）。 – Matthias 2013-04-26 09:24:08

你需要告诉Python的，你要分配给一个全局变量：

def motion_notify_callback(event): 
    global delete 
    ...

来源

2013-04-26 08:52:47 thebjorn

你必须在你的函数开始时就确定delete为global：

def motion_notify_callback(event): 
    global delete 
    .....

来源

2013-04-26 08:52:54

在为全局变量赋值之前引用的局部变量'delete'

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