您可以将re模块用于正则表达式。
有了它，您的代码将如下所示：
import re
def validate():
while True:
password = raw_input("Enter a password: ")
if len(password) < 8:
print("Make sure your password is at lest 8 letters")
elif re.search('[0-9]',password) is None:
print("Make sure your password has a number in it")
elif re.search('[A-Z]',password) is None:
print("Make sure your password has a capital letter in it")
else:
print("Your password seems fine")
break
validate()
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