How to print duplicate letter from two different string in Python

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I am making a program and it needs to print duplicate letters from the two strings inputted by user. The output should be like "duplicate letters are: [ a, b, c]."

While if there is no duplicate letter it will just print "no duplicate letters"

My program keeps print both "duplicate letters are: [ a, b, c]." and "no duplicate letters". How do I fix it?

What I have tried:

firstName = input("What is your first name? ")
lastName = input("What is your last name? ")

for fl in firstName:
    if fl in lastName:
         print("The duplicate character in your First name and Last name is/are: ", list(fl))

else:
    print("No duplicate value for First name and Last name")

Posted 7-Mar-21 21:07pm

Member 15092923

Updated 8-Mar-21 1:16am

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2 solutions

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OriginalGriff · Answer 1 · 2021-03-07T21:15:00

Indentation in Python is significant: it controls flow.
So when your if and else are not indented to exactly the same level, they aren't "part of the same statement" - the for loop does not contain the else part at all!
Try this:

Python

firstName = input("What is your first name? ")
lastName = input("What is your last name? ")

for fl in firstName:
    if fl in lastName:
         print("The duplicate character in your First name and Last name is/are: ", list(fl))

    else:
        print("No duplicate value for First name and Last name")

It's a very stupid way to do things, and it's probably going to bite you many times: make sure that whatever editor you use to edit Python code is set to "replace tabs with spaces" as all whitespace counts as a single space for indentation as far as Python is concerned - which means two lines which look identically indented but which contains spaces for one and tabs for teh other can be treated very, very differently!

CPallini · Answer 2 · 2021-03-08T01:16:00

Solution 2

You could use a list comprehension, e.g.

Python

firstName = input("What is your first name? ")
lastName = input("What is your last name? ")

duplicates = list(set([x for x in firstName if x in lastName]))

if duplicates:
  print("The duplicate character in your First name and Last name is/are: ", duplicates)
else:
    print("No duplicate value for First name and Last name")

Posted 8-Mar-21 1:16am

CPallini

Comments

Maciej Los 8-Mar-21 7:29am

5ed!

CPallini 8-Mar-21 12:49pm

Thank you!

How to print duplicate letter from two different string in Python

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How to print duplicate letter from two different string in Python

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