寻找清单中的项目是否在字串Python 2.7中

Question

我试图查看列表（域）中的项目是否在字符串（电子邮件）中，如果是，则打印电子邮件中是否包含域。 Python告诉我“'in'需要字符串作为左操作数，而不是列表”，并且不会让我将它们进行比较。 有谁知道如何将列表中的单个项目与字符串进行比较？ 提前致谢！

at = '@'
period = '.'
domain = ['.com', '.edu', '.gov', '.org', '.net', '.aaa', '.aarp', 'abb', '.abbott', '.abbvie', '.abogado', '.abudhabi', '.ac', '.academy', '.accenture', '.accountant', '.accountants', '.aco', '.active', '.actor', '.ad', '.adac', '.ads', '.adult', ]
email = raw_input("What is your email? > ")


if period not in email:
    print("You failed")
else:
    print("You have an @ symbol!")


if period not in email:
    print("You do not have a period in your email")
else:
    print("You have a period in your email")


if domain not in email:
    print("You do not have a domain in your e-mail. Oops!")
else:
    print("You have a domain in your email!")

Answer 1

您必须分别对列表中的每个项目进行包含检查。 尽管有一些语法上的Python糖：

if any(x in email for x in domain):
    # good: email contains one of the domains

或更多（验证电子邮件）：

if all(not email.endswith(x) for x in domain):
    # rain hellfire on user

Answer 2

您的逻辑在您自己的代码中是错误的，但是最简单，最快的方法是对.whatever进行切片并在一组域中进行查找：

domains = {'.com', '.edu', '.gov', '.org', '.net', '.aaa', '.aarp', 'abb', '.abbott', '.abbvie', '.abogado', '.abudhabi', '.ac', '.academy', '.accenture', '.accountant', '.accountants', '.aco', '.active', '.actor', '.ad', '.adac', '.ads', '.adult',}


email = raw_input("What is your email? > ")

dom = email[email.rfind("."):]

如果您想继续询问，应该使用一会儿True循环：

at = '@'
period = '.'
domains = {'.com', '.edu', '.gov', '.org', '.net', '.aaa', '.aarp', 'abb', '.abbott', '.abbvie', '.abogado', '.abudhabi', '.ac', '.academy', '.accenture', '.accountant', '.accountants', '.aco', '.active', '.actor', '.ad', '.adac', '.ads', '.adult',}
while True:
    email = input("What is your email? > ")
    if at not in email:
        print("You failed, no @ in your email addrress.")
        continue
    print("You have an @ symbol!")

    if period not in email:
        print("You do not have a period in your email")
        continue
    print("You have a period in your email")

    if email[email.rfind("."):]  in email:
          print("You have a domain in your email!")
          break          
    print("You do not have a domain in your e-mail. Oops!")

print(email)

如果要使用endswith，则只需传递一个域的元组即可：

domains = ('.com', '.edu', '.gov', '.org', '.net', '.aaa', '.aarp', 'abb', '.abbott', '.abbvie', '.abogado', '.abudhabi', '.ac', '.academy', '.accenture', '.accountant', '.accountants', '.aco', '.active', '.actor', '.ad', '.adac', '.ads', '.adult')

然后sin：

if email.endswith(domains)

Answer 3

您只想查看电子邮件地址是否包含域，则可以简单地在python中使用find函数，该函数将返回获取子字符串的索引。

这是我的方式

domain = ['.com', '.edu', '.gov', '.org', '.net', '.aaa', '.aarp', 'abb', '.abbott', '.abbvie', '.abogado', '.abudhabi', '.ac', '.academy', '.accenture', '.accountant', '.accountants', '.aco', '.active', '.actor', '.ad', '.adac', '.ads', '.adult', ]


email = raw_input("What is your email? > ")

for dom in domain:

     if(email.find(dom) != -1):
             print email