How to remove duplicate characters from a string in Python

How to remove duplicate characters from a string in Python.

Here's a step-by-step tutorial on how to remove duplicate characters from a string in Python:

Step 1: Get the input string from the user.

• You can use the input() function to prompt the user to enter a string.

Step 2: Initialize an empty string to store the result.

• We'll use this string to build the final string without duplicate characters.

Step 3: Iterate through each character in the input string.

• You can use a for loop to iterate through each character.

Step 4: Check if the character is already present in the result string.

• You can use the in operator to check if a character is already present.
• If the character is not present, add it to the result string.

Step 5: Print or return the result string.

• After iterating through all the characters, you can either print the result string or return it from the function.

Now, let's see some code examples to illustrate these steps:

Example 1: Using a loop and an empty string

def remove_duplicates(input_string):
    result = ""
    for char in input_string:
        if char not in result:
            result += char
    return result

user_input = input("Enter a string: ")
output = remove_duplicates(user_input)
print("String without duplicates:", output)

Example 2: Using set() to remove duplicates

def remove_duplicates(input_string):
    return "".join(set(input_string))

user_input = input("Enter a string: ")
output = remove_duplicates(user_input)
print("String without duplicates:", output)

Example 3: Using a list comprehension

def remove_duplicates(input_string):
    return "".join([char for index, char in enumerate(input_string) if char not in input_string[:index]])

user_input = input("Enter a string: ")
output = remove_duplicates(user_input)
print("String without duplicates:", output)

These are just a few examples of how you can remove duplicate characters from a string in Python. Choose the method that suits your needs the best. Feel free to modify the code according to your requirements.