http://stackoverflow.com/q/38299137/1431750

# for http://stackoverflow.com/q/38299137/1431750

user_input = raw_input('Please provide your name:')
while user_input != "Q" and user_input != "q":
    if user_input == "":
        print "Your input is required"
        user_input = raw_input('Please provide your name:')
    else:
        print "Youre name has been recorded:", user_input
        break

In action:

>>> user_input = raw_input('Please provide your name:')
Please provide your name:
>>> while user_input != "Q" and user_input != "q":
...     if user_input == "":
...         print "Your input is required"
...         user_input = raw_input('Please provide your name:')
...     else:
...         print "Youre name has been recorded:", user_input
...         break
...
Your input is required
Please provide your name:
Your input is required
Please provide your name:
Your input is required
Please provide your name:A
Youre name has been recorded: A
>>> # it has exit the program
...
>>> user_input = '' # reset `user_input` and run the while loop again
>>> while user_input != "Q" and user_input != "q":
...     if user_input == "":
...         print "Your input is required"
...         user_input = raw_input('Please provide your name:')
...     else:
...         print "Youre name has been recorded:", user_input
...         break
...
Your input is required
Please provide your name:
Your input is required
Please provide your name:q
>>>

# Ideally, what you could do instead is:

while True:
    user_input = raw_input('Please provide your name:')
    if user_input == "Q" or user_input == "q":
        break
    elif user_input == "":
        print "Your input is required"
        continue  # unnecessary but clearer since there's no other code which will run for this block
    else:
        print "Youre name has been recorded:", user_input
        break

# And the shortest way to do it with clarity:

while True:
    user_input = raw_input('Please provide your name:')
    if user_input in ("Q", "q"):
        break
    if user_input == "":
        print "Your input is required"
        continue  # necessary in this case
    print "Youre name has been recorded:", user_input
    break

Please provide your name:
Your input is required
Please provide your name:
Your input is required
Please provide your name:q
>>>
>>> # run the loop again to test valid input
...
Please provide your name:
Your input is required
Please provide your name:A
Youre name has been recorded: A
>>>