python - python err : Local variable referenced before assignment

Question

我收到错误UnboundLocal: Local variable T referenced before assignment，但是不是这样的:

import ...
T = 0

def do_something():
    do_something_else(T) # err at this line
T += 1

def do_something_else(t):
    print t

do_something()

这就是我的代码的样子，因此在分配之前没有引用。 (如果我做错了，请纠正我)怎么了？

Answer 1

将T声明为全局变量:

def do_something():
    global T # <--------------
    do_something_else(T) # err at this line
    T += 1