Python: Remove duplicate characters of a given string

Last update on April 19 2025 13:06:43 (UTC/GMT +8 hours)

Remove duplicate characters in string.

Write a Python program to remove duplicate characters from a given string.

Visual Presentation:

Sample Solution:

Python Code:

# Import the OrderedDict class from the collections module
from collections import OrderedDict

# Define a function to remove duplicate characters from a string
def remove_duplicate(str1):
    # Create an OrderedDict object to store unique characters and their order
    unique_characters = OrderedDict.fromkeys(str1)

    # Join the keys of the OrderedDict to form a string without duplicates
    return "".join(unique_characters.keys())

# Remove duplicate characters from the string "python exercises practice solution"
result1 = remove_duplicate("python exercises practice solution")
print(result1)  

# Remove duplicate characters from the string "w3resource"
result2 = remove_duplicate("w3resource")
print(result2)  

Sample Output:

python exrcisalu
w3resouc

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to remove duplicate characters from a string while preserving the order of their first occurrence.
• Write a Python program to use a loop and a set to build a string with only unique characters from the original.
• Write a Python program to implement duplicate removal recursively from a given string.
• Write a Python program to filter out repeated characters using list comprehension and return the deduplicated string.

Go to:

• Python Data Type String Exercises Home ↩
• Python Exercises Home ↩

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