python - 无法在 Python 中分配给文字

Question

我在 python 中收到一个错误，提示我“无法分配给文字”。我希望有人能帮助我理解为什么会出现这种情况。这是我的代码:

# Chapter 3 Challenge part 3
# use the code below and the following
# directions to see if you can solve the problem

# Your Co-Worker has been asked to write a
#   1st time "Log-in" program in which a user has to
#    sign in with their user name. If they enter
#    the correct id name they need to be asked
#    to create their password.

#   They were required to make sure the user did
#   not leave the username entry blank and must have the
#   correct user name or the progam should re-ask
#   them to sign in... They cannot figure out what
#   to do, so they have called on you to help...

#   Here is what they have so far...
#   They started their program like this....
#   and included some of their documentation.



# Get username, check to see if not empty,
# then verify that username is correct.
# using username "jalesch" as test user.
name = False
while not name:
    name = raw_input("Enter your user name: ")

print "Welcome," , name ,  "you must create a password."

password = False

while not password:
    password = raw_input("""Enter a password.
Password must be at least 6 characters in length,
and must include one of these symbols (!, $, ?, &): """)
    while len(password) < 6:
        for "!" in password or "$" in password or "?" in password or "&" in password:
            password = raw_input("""Enter a password.
Password must be at least 6 characters in length,
and must include one of these symbols (!, $, ?, &): """)

    print "This has met the requirements."

check = raw_input("Please re-enter your password:")
while check != password:
    print "You have entered the wrong password"
    check = raw_input("Please re-enter your password:")
print "Welcome to the program!"


# prompt user to create a password that meets the
# following requirements:
#       - Must be at least 6 characters in length
#       - Must include at least one of these 4 symbols
#           - ! $ ? &
# Once the user has entered their password, the program
#  must check to see if it meets the requirements.
#   If the requirements are not met, it should reask them
#   to put in a password that meets the requirements
#   until they get it correct.
#   Test password is:  $program!

#   If it meets the requirements then prompt the user
#   to re enter the password, and check that the
#   first and second entry matches.
#       If the 1st and 2nd match. display "Welcome to the program"
#       If the 1st and 2nd don't match, re-prompt for the password
#       until they get a correct match. 

我还认为当我尝试查找特殊字符时代码出现故障，因为它跳过了一个 while 循环。感谢任何帮助，谢谢。

Answer 1

在这一行:

for "!" in password or "$" in password or "?" in password or "&" in password:

您可能打算使用 if:

if "!" in password or "$" in password or "?" in password or "&" in password:

for x in y 遍历 y，依次将每个成员分配给 x，为每个成员循环运行以下缩进代码y。您不能为 "!" 赋值，因为它是一个文字字符，而不是一个变量。