如果您的用户输入的单词的第一个字母没有大写，如何做程序将终止？

Question

如何使此程序只接受用户输入，而遵循适当的大写。就像它不会接受“罗宾汉”除非是“罗宾汉”。当我运行它时，上面写着..。

Traceback (most recent call last):
  File "C:\Users\AMD-Ryzen\Documents\PY CODEX\3.1.py", line 20, in <module>
    if x.isupper() == false:
AttributeError: 'list' object has no attribute 'isupper'

这是我的密码：

#List of the movies
lst = ['Spidey', 'Castaway', 'Avengers', 'GI. JOE', 'Shallow']

#The data stored in this list will come from input("Name of movie") using .append
x=[]

print("Enter at least 5 of your favorite movies"+"\n")

#Loop to repeat the same question 5 times
for i in range(5):                  
    x.append(input("Name of movie:"))

#I used the set.intersection method to find the common elements between the two list
lst_as_set = set(lst)
intersection = lst_as_set.intersection(x)
intersection_as_lst = list(intersection)



if x.isupper() == false:
    print("It will never work out. Nice meeting you!")


elif len(intersection_as_lst) == 3:
    Ques = input("\n"+"Do you love some of his movies?:")
    if Ques == "yes":
        print("\n"+"You have", len(intersection_as_lst), "common fave movies and they are:")
        print(intersection_as_lst)
    elif Ques == "no":
        print("It will never work out. I dont like")
        s = set(x) - set(lst)
        print(s)

elif len(intersection_as_lst) == 0:
    Ques = input("Do you love some of his movies?:")
    if Ques == "yes":
        print("It will never work out. Nice meeting you!")
    else:
        print("It will never work out. Nice meeting you!")

Answer 1

发生此错误是因为您试图将字符串方法 isupper()应用于列表。必须对参数使用循环：

for c in x:
    if not c[0].isupper():
        print("It will never work out. Nice meeting you!")
        break

Answer 2

您正在检查list是否为和。你需要做的

output = []
for word in x:
    if word[0].isupper() == False:
        output.append(word)
        print("It will never work out. Nice meeting you!")

Answer 3

在python中，首先是False，而不是false。当您想要停止程序时，可以引发异常。

x = list()
print("Enter at least 5 of your favorite movies\n")
for i in range(5):
    m_name = input("Name of movie: ")
    if m_name[0].islower():
        raise 'must start with an uppercase letter'
    x.append(m_name)