为什么mark_already和needed_mark都是未定义的？Python

Question

def min_final_mark(learning_modules_mark, assignment_mark, test_mark):
    " return minimum final test mark "
    mark_already = (learning_modules_mark * 0.15) + (assignment_mark * 0.15) + (test_mark * 0.15) 
    needed_mark = 50 - mark_already
print("Needed exam mark: {:.2f}".format(needed_mark))

Answer 1

needed_mark的作用域绑定到函数min_final_mark。这意味着一旦函数退出，您就不能再使用在函数中声明的变量。

要在函数外部使用needed_mark值，必须返回它。

def min_final_mark(learning_modules_mark, assignment_mark, test_mark):
    " return minimum final test mark "
    mark_already = (learning_modules_mark * 0.15) + (assignment_mark * 0.15) + (test_mark * 0.15) 
    needed_mark = 50 - mark_already
    return needed_mark

needed_mark = min_final_mark(...)
print("Needed exam mark: {:.2f}".format(needed_mark))

Answer 2

mark_already和needed_mark仅在函数min_final_mark()内定义；您不能在函数外部调用它们。