因此，我正在制作一个登录系统，能够创建用户名并传递用户名，然后将其写入文件，然后再次运行时加载这些文件（使用pickle，用过2个原因无法弄清为什么不这样做）。加载两个列表）
但是我似乎无法弄清的主要问题是，在控制台上运行它只是在密码创建阶段就关闭了。
但是在编辑器（pycharm）中运行却可以。只是在寻求建议。为什么如果我写入相同的pickle文件，它将无法正确回读，以及为什么它在控制台中崩溃。我错过了什么吗？
#import os to use cls feature
#import time to use the sleep feature
#import pickle to save and read pickle files
import os,time
import pickle
# log in function
def Login():
print("**Login Systems****")
print("")
usertry = input ("Please Enter your user name = ").lower()
if usertry in usernames:
# checks if in list
positioncheck = usernames.index(usertry)
#print(positioncheck)
number_of_tries = 3
password_correct = False
while number_of_tries > 0 and not password_correct:
# number of tried will go down if password is wrong
passtry = input("Please enter your password = ")
# position of password is checked on list to see if matches username position
if passtry in passwords:
positioncheck2 = passwords.index(passtry)
print(positioncheck2)
if positioncheck == positioncheck2:
os.system("cls")
print("**Barraclough Systems****")
print("")
print("Password accepted Log In Sucessfull")
password_correct = True
time.sleep(10)
else:
print("Username and password miss match ")
number_of_tries -= 1
# reduces the number of tries remaining
else:
print("Password is incorrect.")
number_of_tries -= 1
if number_of_tries == 0:
print('too many tries - exiting program')
exit()
# user is asked if they would like to retry
elif usertry not in usernames:
print("This is not a valid username ")
time.sleep(2)
again = input("Would you like to try again ? ( Y or N ) " ).lower()
if again == "y":
os.system("cls")
Login()
else:
print("Returning to Main menu : ")
time.sleep(2)
os.system("cls")
# username creation Function
def NewUser():
print("**Login Systems****")
print("")
print("TIP: If username taken try using nickname for first name ")
print("")
GenUser = ""
#validility checks set to false for checking if entry was valid
valid_first = False
valid_last = False
# if entry with less no characters are detected error given.
while not valid_first:
FirstName = input("Please enter your First Name = ").lower()
if len(FirstName) < 1:
print ("No entry was detected. Please try again")
else:
valid_first = True
# if entry with less no characters are detected error given.
while not valid_last:
LastName = input("Please Enter your Last Name = ").lower()
if len(LastName) < 1:
print("No entry was detected. Please try again")
else:
valid_last = True
# the first 3 characters are taken from first and last name strings to create a new shorter one for the username
First3 = FirstName[0:3]
Last3 = LastName[0:3]
GenUser = First3 + Last3
if GenUser in usernames:
print("This user name is taken please retry ")
time.sleep(3)
os.system("cls")
NewUser()
# username has been created and then added to the list
else:
usernames.append(GenUser)
print("Your Generated Username is", GenUser)
print("\n\nPlease Take Note of this username, You will next be asked to create a password ")
print("")
input ("\nPress enter to continue")
os.system("cls")
CreatePass()
# password creation function.
def CreatePass():
valid_password = False
while not valid_password:
valid_password = True
# to reset at the start of each loop
print("**Login Systems****")
print("\nYou password must contain :")
print("1 Upper Case Character")
print("1 Lower Case Character")
print("1 Number")
print("1 Special Symbol from the following ! £ $ % & @ # ? ")
print("Must be between 8 - 16 characters in length\n")
print("")
Symbols = ["!", "£", "$", "%", "&", "@", "#","?"]
# creation of symbols to allow checking
password = input("Enter a password = ")
# password will then go through validation checks
if len(password) < 8 or len(password) > 16:
print ("\npassword needs to be between 8 and 16 characters")
valid_password = False
if not any(char.isupper() for char in password):
print ("\nPassword needs an upper case character.")
valid_password = False
if not any(char.islower() for char in password):
print ("\nPassword requires a lower case character.")
valid_password = False
if not any(char.isdigit() for char in password):
print ("\nPassword requires a number.")
valid_password = False
if not any(char in Symbols for char in password):
print ("\nPassword requires a special character (! £ $ % & @ # ? ). Please try again\n ")
valid_password = False
# If valid the password will be added to the list
if valid_password:
passwords.append(password)
pickle.dump(usernames, open("names.pck", "wb"))
pickle.dump(passwords, open("pass.pck", "wb"))
print("\nYour Password Has been Accepted\n")
print("You will now be redirected to the menu where you can log in")
time.sleep(4)
os.system("cls")
else:
print('\n\nPlease try again\n\n')
# just so i can see if the passwords and username's had saved to the list
def testing():
print(usernames)
print(passwords)
# my 2 lists for the username and passwords
# followed by a pre-set varible
usernames = []
passwords = []
selection = 99
try:
usernames = pickle.load(open("names.pck", "rb"))
passwords = pickle.load(open("pass.pck", "rb"))
except:
print()
# menu selection, a few print statements in an if statement calling a defined function
while selection != "0":
print("**Login Systems****\n")
print("1. Login")
print("2. Create New user")
print("3. PRINT USER NAMES AND PASSWORDS. TESTING PURPOSES ONLY \n")
selection = input("Please select a menu option : ")
os.system("cls")
if selection == "1":
Login()
elif selection == "2":
NewUser()
elif selection == "3":
testing()
else:
print()