python - 赋值前引用的局部变量 'x'

Question

def main():
        tests = get_initial_input(tests)
        assignments = get_initial_input(assignments)
        exercises = get_initial_input(exercises)
        labs = get_initial_input(labs)
        finals = get_initial_input(finals)
        print(tests, assignments, labs)


def get_initial_input(x):
        val = int(input("How many", x , "were there?    "))
        return val

main()

我一直收到错误:

UnboundLocalError: local variable 'tests' referenced before assignment

我已经尝试了很多不同的方法来尝试让测试转到 get_initial_input() 但它说它在赋值之前被引用。

当我尝试定义它的第一行代码时，这怎么可能？

Answer 1

当您使用时:

tests = get_initial_input(tests)

首先发生的事情是 Python 试图评估这个:

get_initial_input(tests)

但是 tests 还没有定义，所以你会得到一个 UnboundLocalError。