How to repeat a code when its statement is false [Python]

Question

I really want to learn how do I repeat my code when its statement is false in Python. I just wanna know, how do I make Python ask for username and password again if its wrong? Here is my code:

print("Enter username")
username = input()
print("Enter password")
pword = input()
if username=="Shadow" and pword=="ItzShadow":
   print("Access granted to Shadow!")
else:
   print("Wrong username and / or password")

I meant, how can I make Python ask for Username and Password again if one of it is false?

Place all your code in a `while True:` loop and after `print("Access granted to Shadow!")`, add a `break` statement. — CristiFati, May 31 '18 at 16:09
If you enter "how do I repeat my code when its statement is false in Python" into the google search bar, you will find the answer quite quickly. — Larry Lustig, May 31 '18 at 16:09
Possible duplicate of [Asking the user for input until they give a valid response](https://stackoverflow.com/questions/23294658/asking-the-user-for-input-until-they-give-a-valid-response) — StephenTG, May 31 '18 at 16:11

score 4 · Answer 1 · answered May 31 '18 at 16:09

You need to enclose your code in a loop. Something like this:

def get_user_pass():
   print("Enter username")
   username = input()
   print("Enter password")
   pword = input()
   return username, pword

username, pword = get_user_pass()
while not(username=="Shadow" and pword=="ItzShadow"):
   print("Wrong username and / or password")
   username, pword = get_user_pass()

print("Access granted to Shadow!")

score 2 · Answer 2 · answered May 31 '18 at 16:12

Use a while loop:

while True:
    print("Enter username")
    username = input()
    print("Enter password")
    pword = input()
    if username=="Shadow" and pword=="ItzShadow":
        print("Access granted to Shadow!")
        break # Exit the loop
    else:
        print("Wrong username and / or password") # Will repeat

stuff() # Only executed when authenticated

score 0 · Answer 3 · edited Jun 03 '18 at 05:46

0

We are using the data entering function get_input in the loop each time the user and password aren't same.

def get_input():
# enter your declarations here
return [user_name,password]

user,pwd=get_input()
while (user!='your desired user' and pwd!='the password'):
    print('Not authorized')
    user,pwd=get_input()
print('Your success message')

edited Jun 03 '18 at 05:46

soundslikeodd

1,078
3
19
32

answered May 31 '18 at 16:13

Uddeshya Singh

59
2
8

Can you please explain your answer? You can use https://stackoverflow.com/help/how-to-answer for help. – soundslikeodd May 31 '18 at 16:31
@soundslikeodd We are using the data entring loop (get_input) each time the user and password aren't same – Uddeshya Singh May 31 '18 at 16:38
Please add this explanation to your answer. – soundslikeodd Jun 01 '18 at 13:41
@soundslikeodd Added – Uddeshya Singh Jun 02 '18 at 04:46

How to repeat a code when its statement is false [Python]

3 Answers3