Error in small code

[Terry Reedy]

<bubu_python at ibest.com.br> wrote in message
news:200406030454.i534sbQ10955 at mailweb05.ibest.com.br...
> def cell_click(event):
>     if (event.widget["text"] == " "):
>         if (pturn == 1):
>             event.widget["text"] = marks[1]
>             pturn = 0
>         else:
>             event.widget["text"] = marks[0]
>             pturn = 1

As the ref manual says someplace, a variable potentially assigned a value
(ie, it is the target of an assignment statement) *anywhere* in a function
is local unless declared global.  Function compilation is two pass: 1)
categorize names; 2) generate byte code.

Terry J. Reedy