Question

Lab: User login system (python)

Create a user login system. Your code should do the following:

1.Load your user database from “UD.txt” (USE THE EXACT FILE NAME, file is given in the folder)

2.Display “Login or create a new user? Select L to login, select C to create new user.”

3. If wrong selection is entered, take the user back to step 2.

4. If the user entered “L”, display “Please enter your user name and hit enter”

5. Check to see if the user is in UD.txt, if not, display “User not found” take the user back to 2

6. If the username is in UD.txt, then prompt user to enter password by displaying: “Enter password”

7. check to see if the user has the correct password, if yes, display “you are logged in”, else, display “wrong password” and take the user back to 2.

8. If the user entered C at step 2, prompt the user to create a new username by displaying “Please enter your first name, last name, and student ID, separated by a space”. The user name should be the First letter of the first name, the first two letters of the last name, and the first three numbers of the student ID. For example: if the user entered “Tom Waits 567890”, the user ID should be “twa567”.

9. Once username is generated, then prompted the user for password by displaying “Please enter password”

10. Prompt the user to reenter password “Please reenter password:”

11: Check to see if the two passwords are the same, if not, display: “Password did not match”, and go to step 10.

12. If two passwords match, save the new generated username and password into “UD.txt”, and display “User created.”

13 Take the user back to 2, and make sure the new username and password works.

Some sample codes:

sample_list=[]#create a sample list

for line in exampleline: # get each line from the file

if line[0:4] == 'USER': #ignore the the header line

       continue # skip header line

line_list = line.split(',') #split the lines

Execution Example:

Login or create a new user? Select L to login, select C to create new user.

H #(user input, go back to setp 2)

Login or create a new user? Select L to login, select C to create new user.

L (user input)

Please enter your user name and hit enter

Zzz (user input)

User not found

Login or create a new user? Select L to login, select C to create new user.

L (user input)

Please enter your user name and hit enter

dcf987 (user input)

Enter password

Test22 (user input)

wrong password

Login or create a new user? Select L to login, select C to create new user.

L (user input)

Please enter your user name and hit enter

dcf987 (user input)

Enter password

BHYW4fw (user input)

you are logged in

Login or create a new user? Select L to login, select C to create new user.

C (user input)

Please enter your first name, last name, and student ID, separated by a space

Tom Waits 567890 (user input)

Please enter password

123456 (user input)

Please reenter password:

456789 (user input)

Please enter password

123456 (user input)

Please reenter password:

123456 (user input)

User created

UD.txt file

USERNAME,PASSWORD

sdd233,Pad231

dcf987, BHYW4fw

dgr803,Sb83d2d

mkr212,UNNHS322

lki065,dgw6234

ped332,9891ds

ytr876,dsid21kk

nmh223,3282jd3d2

Answer 1

Code

exampleline = open("UD.txt", "r")
userName_list=[]#create a sample list
password_list=[]
for line in exampleline: # get each line from the file
if line[0:4] == 'USER': #ignore the the header lin e
continue # skip header line
line_list = line.split(',') #split the lines
userName_list.append(line_list[0])
password_list.append(line_list[1].rstrip())

while True:
print("Login or create a new user? Select L to login, select C to create new user.")
choice=input()
if(choice=="L"):
print("Please enter your user name and hit enter")
username=input()
if(username in userName_list):
userNameindex=userName_list.index(username)
print("Enter password")
password=input()
if(password_list[userNameindex]==password):
print("you are logged in")
else:
print('Wrong password')
else:
print("User not found")
elif(choice=="C"):
print("Please enter your first name, last name, and student ID, separated by a space")
firstName, lastName, id = input("").split()
username=firstName[0].lower()+lastName[:2].lower()+id[:3]
while True:
print("Please enter password")
password=input()
print("Please reenter password:")
rePassword=input()
if(password==rePassword):
break
userName_list.append(username)
password_list.append(password)
print('User Created')

output

code snaps

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