Closing a program - Printable Version

Closing a program - Printable Version

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Closing a program - oldDog - Jul-28-2018

Have been trying to learn about dictionaries in Python 3 at Understanding Dictionaries in Python 3

# Define original dictionary
usernames = {'Sammy': 'sammy-shark', 'Jamie': 'mantisshrimp54'}

# Set up while loop to iterate
while True:

    # Request user to enter a usernames
    print('Enter a name:')

    # Assign to name variable
    name = input()

    # Check whether name is in the dictionary and print feedback
    if name in usernames:
        print(usernames[name] + ' is the name of ' + name)

    # If the name is not in the dictionary...
    else:

        #provide feedback
        print('I don\'t have ' + name + '\'s username, what is it?')

        # Take in a new username for the associated username
        username = input()

        # Assign username value to name key
        usernames[name] = usernames

        # Print feedback that the data was updated
        print('Data updated.')

But when i try to close the program using Ctrl + C i get the following error:

^CTraceback (most recent call last)
   File "/home/oldDog/usernames.py", line 13, in <module>
     name = input()
KeyboardInterrupt

Could someone help me please

RE: Closing a program - gontajones - Jul-28-2018

This is the expected (normal) behavior when you send a CTRL+C to the running python script.
If you want to handle this Exception (KeyboardInterrupt) you can do something like this:

try:
    input('Press CTRL+C!')
except KeyboardInterrupt:
    print('\nCTRL+C Received!')
print('Bye')

RE: Closing a program - oldDog - Jul-28-2018

Have now solved the problem by using

import sys
sys.exit()

Thanks for the reply gontajones

RE: Closing a program - snippsat - Jul-28-2018

You should have way to break out of the while loop.
This is not nice nice have ' + name + '\'s.
Python has string formatting and the best way is f-string from 3.6 -->.
Here rewritten version,also think of that update is lost every time run code again Wink

usernames = {'Sammy': 'sammy-shark', 'Jamie': 'mantisshrimp54'}
while True:
    name = input('Enter a name,<Q> to quit: ')
    if name.lower() == 'q':
        break
    if name in usernames:
        print(f'{usernames[name]} is the name of {name}')
    else:
        print(f"I don't have {name}'s username, what is it?")
        name = input('Enter new username')
        usernames[name] = name
        print('Data updated.')

RE: Closing a program - oldDog - Jul-29-2018

Hey would like to thank both gontajones and snippsat for all their help.
Thanks guys