In this tutorial, we will program 'How to Find All Duplicate Characters in a String Using Python'. We will learn how to detect duplicate characters in a string. The objective is to enable you to track all duplicates within a string. I will provide a sample program to demonstrate the actual coding of this tutorial.

This topic is very easy to understand; just follow the instructions I provide, and you can also do it yourself with ease. The program I will show you covers the basics of programming for finding duplicate character in a string. I will do my best to provide you with the easiest way for getting all the duplicates from string. So, let's start with the coding.

Getting Started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

Creating Main Function

This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.

1. def
   
   findDupe(
   
   string
   
   )
   
   :
   
2. 
   
3. chars =
   
   {
   
   }
   
4. 
   
5. 
   
6. for
   
   char in
   
   string
   
   :
   
7. 
   
8. if
   
   char not
   
   in
   
   chars:
   
9. chars[
   
   char]
   
   =
   
   1
   
10. else
    
    :
    
11. chars[
    
    char]
    
    +=
    
    1
    
12. 
    
13. 
    
14. duplicates =
    
    [
    
    ]
    
15. 
    
16. for
    
    char,
    
    count in
    
    chars.items
    
    (
    
    )
    
    :
    
17. if
    
    count >
    
    1
    
    :
    
18. duplicates.append
    
    (
    
    char)
    
19. 
    
20. return
    
    duplicates
    
21. 
    
22. 
    
23. ret =
    
    False
    
24. 
    
25. 
    
26. while
    
    True
    
    :
    
27. print
    
    (
    
    "\n
    
    ================== Find all Duplicate Characters in String ==================\n
    
    \n
    
    "
    
    )
    
28. 
    
29. mystr=
    
    input
    
    (
    
    "Enter a string: "
    
    )
    
30. 
    
31. print
    
    (
    
    findDupe(
    
    mystr)
    
    )
    
32. 
    
33. 
    
34. opt =
    
    input
    
    (
    
    "\n
    
    Do you want to try again?(yes/no): "
    
    )
    
35. 
    
36. if
    
    opt.lower
    
    (
    
    )
    
    ==
    
    'yes'
    
    :
    
37. ret=
    
    False
    
38. elif
    
    opt.lower
    
    (
    
    )
    
    ==
    
    'no'
    
    :
    
39. ret=
    
    True
    
40. print
    
    (
    
    "Exiting program...."
    
    )
    
41. 
    
42. else
    
    :
    
43. print
    
    (
    
    "Please enter yes/no:"
    
    )
    
44. break
    
45. 
    
46. if
    
    ret ==
    
    False
    
    :
    
47. continue
    

This Python script identifies and returns all duplicate characters in a given string. The script uses a dictionary to count the occurrences of each character, then constructs a list of characters that appear more than once. The user is prompted to enter a string, and the script prints the duplicate characters found in that string. The user can choose to try again or exit the program.

Output:


The How to Find all Duplicate Characters in String using Python source code that I provide can be download below. Please kindly click the download button.

There you have it we successfully created How to Find all Duplicate Characters in String using Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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