How do I print a specific message if the user inputs the same string twice in Python?

Question

I am practicing my Python skills. I am currently on week 4 and stuck on doing a specific task. If a user enter the same string twice in my self.songs input I want to print a message saying "You can't enter the same song twice. Try again".

How can I do this? Also, is there a way for the user the use commas instead of white space to separate each string while inputing their favourite songs?

  class User:
    def __init__(self):
        self.name = ''
        self.songs = ()
        self.movies = ()
        self.sports = ()

    def tops(self):
        self.name = input("What's you're full name?:")
        while True:
            self.songs = input('Hi ' + self.name + ', what is your top 5 favorite songs?:').split()
            if len(self.songs) > 5:
                print('You entered more than 5 songs. Try again')
            elif len(self.songs) < 5:
                print('You entered less than 5 songs. Try again')
            elif len(self.songs) == 5:
                for song in self.songs:
                    print(song)
                confirm_input = input('Do you confirm?')
                if confirm_input == 'Yes':
                    print(type(self.songs))
                    print(self.songs)
                    break
                elif confirm_input == 'No':
                    continue


quizUser = User()
quizUser.tops()

confirm_input = input('Type Yes to confirm'), So, the user knows to type Yes instead of the usual y :) — Abhishek Rai
– Abhishek Rai, Commented Nov 28, 2020 at 11:38
Not to criticize the question or answers. However sometimes taking a different approach can be useful. If you refactored to ask titles in a loop until 5, you’d easily achieve non-duplication by checking in the list. Plus, you could enter You Can't Always Get What You Want, which is currently impossible here. — JL Peyret
– JL Peyret, Commented Nov 28, 2020 at 16:28

azro · Accepted Answer · 2020-11-28 10:00:08Z

2

You may use a set to get unique element, then compare its length with the answer length

if len(set(self.songs)) != len(self.songs):
    print("You can't enter the same song twice. Try again")    
elif len(self.songs) > 5:
    print('You entered more than 5 songs. Try again')
elif len(self.songs) < 5:
    print('You entered less than 5 songs. Try again')
...

edited Nov 28, 2020 at 10:00

answered Nov 28, 2020 at 9:48

azro

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Comments

ppwater · Accepted Answer · 2020-11-28 09:49:32Z

You can use set to get no same elements, and compare it's length with the normal list by using !=.

add this to your code:

elif len(set(self.songs)) != len(self.songs):
    print('You can\'t enter the same song twice. Try again')

by the way, \' means escaping '.

The whole code:

class User:
        def __init__(self):
            self.name = ''
            self.songs = ()
            self.movies = ()
            self.sports = ()
    
        def tops(self):
            self.name = input("What's you're full name?:")
            while True:
                self.songs = input('Hi ' + self.name + ', what is your top 5 favorite songs?:').split()
                if len(self.songs) > 5:
                    print('You entered more than 5 songs. Try again')
                elif len(self.songs) < 5:
                    print('You entered less than 5 songs. Try again')
                elif len(self.songs) != len(set(self.songs)):
                    print('You can\'t enter the same song twice. Try again')
                elif len(self.songs) == 5:
                    for song in self.songs:
                        print(song)
                    confirm_input = input('Do you confirm?')
                    if confirm_input == 'Yes':
                        print(type(self.songs))
                        print(self.songs)
                        break
                    elif confirm_input == 'No':
                        continue
    
    
quizUser = User()
quizUser.tops()

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