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最後に最後の部分を除いてログイン詳細ボールトプログラムを終了しました。Python：else文の後にwhileループを続ける
ユーザーがregister（）を使用して辞書にログインの詳細を追加する前にlogin（）を呼び出すために「a」を入力してログインオプションにアクセスしようとすると、「ユーザー名またはパスワードが保存されていません！ "メニュー（）に戻ります。
代わりに、単にメッセージを出力するだけで、私がしたいようにメニュー（）に戻るのではなく、プログラムが停止します。
私はこのelse文でmenu関数を呼び出そうとしましたが、これを行うとmain関数のループで実行されるメニュー（）に "b"を入力してregister（）を呼び出そうとします。 （）関数は呼び出されず、ログインの詳細を追加せずにlogin（）を呼び出すのと同じように突然停止します。私の他の解決策は、ループを動作させるように見えましたが、メニューに2度の入力を求めるバグが多くなり、時には何も呼び出さないことがありました。
vault = {}
def menu():
print("Welcome to the main menu")
mode = input("""Hello {}, below are the modes that you can choose from:\n
##########################################################################
a) Login with username and password
b) Register as a new user
To select a mode, enter the corresponding letter of the mode below
##########################################################################\n
> """.format(name)).strip()
return mode
def login():
if len(vault) > 0 : #user has to append usernames and passwords before it asks for login details
print("Welcome {} to the login console".format(name))
noloop = True
while noloop:
username = input("Please enter username: ")
if username == "":
print("Username not entered, try again!")
continue
password = input("Please enter password: ")
if password == "":
print("Password not entered, try again!")
continue
try:
if vault[username] == password:
print("Username matches!")
print("Password matches!")
noloop = logged() #jumps to logged function and tells the user they are logged on
return noloop
except KeyError: #the except keyerror recognises the existence of the username and password in the list
print("The entered username or password is not found!")
else:
print("You have no usernames and passwords stored!")
def register():
print("Please create a username and password into the password vault.\n")
while True:
validname = True
while validname:
username = input("Please enter a username you would like to add to the password vault. NOTE: Your username must be at least 3 characters long: ").strip().lower()
if not username.isalnum():
print("Your username cannot be null, contain spaces or contain symbols \n")
elif len(username) < 3:
print("Your username must be at least 3 characters long \n")
elif len(username) > 30:
print("Your username cannot be over 30 characters long \n")
else:
validname = False
validpass = True
while validpass:
password = input("Please enter a password you would like to add to the password vault. NOTE: Your password must be at least 8 characters long: ").strip().lower()
if not password.isalnum():
print("Your password cannot be null, contain spaces or contain symbols \n")
elif len(password) < 8:
print("Your password must be at least 8 characters long \n")
elif len(password) > 20:
print("Your password cannot be over 20 characters long \n")
else:
validpass = False #The validpass has to be True to stay in the function, otherwise if it is false, it will execute another action, in this case the password is appended.
vault[username] = password
validinput = True
while validinput:
exit = input("\nEnter 'end' to exit or any key to continue to add more username and passwords:\n> ")
if exit in ["end", "End", "END"]:
return
else:
validinput = False
register()
return register
def logged():
print("----------------------------------------------------------------------\n")
print("You are logged in")
#Main routine
print("Welcome user to the password vault program")
print("In this program you will be able to store your usernames and passwords in password vaults and view them later on.\n")
validintro = False
while not validintro:
name = input("Greetings user, what is your name?: ")
if len(name) < 1:
print("Please enter a name that is valid: ")
elif len(name) > 30:
print("Please enter a name with no more than 30 characters long: ")
else:
validintro = True
print("Welcome to the password vault program {}.".format(name))
#The main program to run in a while loop for the program to keep on going back to the menu part of the program for more input till the user wants the program to stop
validintro = False
while not validintro:
chosen_option = menu() #a custom variable is created that puts the menu function into the while loop
validintro = False
if chosen_option in ["a", "A"]:
validintro = not login()
elif chosen_option in ["b", "B"]:
register()
else:
print("""That was not a valid option, please try again:\n """)
validintro = False