python - 类型错误 : 'str' object is not callable

Question

name = raw_input("Welcome soldier. What is your name? ")
print('Ok,', name, ' we need your help.')
print("Do you want to help us? (Yes/No) ")
ans = raw_input().lower()

while True:
    ans = raw_input().lower()("This is one of those times when only Yes/No will do!" "\n"  "So what will it be? Yes? No?")

    ans = raw_input().lower()
    if ans() == 'yes' or 'no':
        break
    if ans == "yes":
        print ("Good!")
    elif ans == "no":
        print("I guess I was wrong about you..." '\n' "Game over.")

当我回答时会发生这种情况；

首先是一个空行，然后如果我再次按下回车键；

  File "test.py", line 11, in <module>
    ans = raw_input().lower()("This is one of these times when only Yes/No will
do!" "\n" "So what will it be? Yes? No?")
TypeError: 'str' object is not callable

问题出在哪里？

P.S 我搜索了该站点，但似乎所有遇到相同问题的人都有更高级的脚本，而我什么都不懂。

Answer 1

第一个错误在行中

ans = raw_input().lower()("This is one of those times when only Yes/No will do!"
                          "\n"  "So what will it be? Yes? No?")

lower() 的结果是一个字符串，后面的圆括号表示左边的对象(字符串)被调用。因此，你得到了你的错误。你要

ans = raw_input("This is one of those times when only Yes/No will do!\n"
                "So what will it be? Yes? No?").lower()

此外，

if ans() == 'yes' or 'no':

不是你所期望的。同样，ans 是一个字符串，括号表示左边的对象(字符串)被调用。因此，您会收到错误消息。

此外，or 是逻辑运算符。即使在删除 ans 之后的括号之后，代码也会被评估为:

if (ans == 'yes') or ('no'):

由于非空字符串('no')的计算结果为 boolean值为 True，此表达式始终为 True。你只是想要

if ans in ('yes', 'no'):

此外，您还想取消缩进最后几行。总而言之，尝试:

name = raw_input("Welcome soldier. What is your name? ")
print('Ok, ' + name + ' we need your help.')
ans = raw_input("Do you want to help us? (Yes/No)").lower()
while True:
    if ans in ('yes', 'no'):
        break
    print("This is one of those times when only Yes/No will do!\n")
    ans = raw_input("So what will it be? Yes? No?").lower()

if ans == "yes":
    print("Good!")
elif ans == "no":
    print("I guess I was wrong about you..." '\n' "Game over.")