Python: Convert all the characters in uppercase and lowercase and eliminate duplicate letters from a sequence

Last update on April 22 2025 12:56:29 (UTC/GMT +8 hours)

6. Case Conversion & Dedup Map

Write a Python program to convert all the characters into uppercase and lowercase and eliminate duplicate letters from a given sequence. Use the map() function.

Sample Solution:

Python Code :

# Define a function named change_cases that converts a character to its upper and lower cases
def change_cases(s):
    return str(s).upper(), str(s).lower()

# Create a set named 'chrars' containing characters
chrars = {'a', 'b', 'E', 'f', 'a', 'i', 'o', 'U', 'a'}

# Print the original set of characters
print("Original Characters:\n", chrars)

# Use the map function to apply the change_cases function to each character in 'chrars'
result = map(change_cases, chrars)

# Print a message indicating the operation to be performed
print("\nAfter converting above characters in upper and lower cases\nand eliminating duplicate letters:")

# Print the result of the map operation as a set, eliminating duplicate letters
print(set(result))

Sample Output:

Original Characters:
 {'f', 'b', 'U', 'i', 'o', 'E', 'a'}

After converting above characters in upper and lower cases
and eliminating duplicate letters:
{('U', 'u'), ('O', 'o'), ('A', 'a'), ('B', 'b'), ('F', 'f'), ('I', 'i'), ('E', 'e')}

For more Practice: Solve these Related Problems:

Write a Python program to convert each string in a list to both uppercase and lowercase, then remove duplicate characters using map.
Write a Python program to map a lambda that returns a tuple of (uppercase, lowercase, sorted unique characters) for each string in a list.
Write a Python program to convert each string into a list of unique characters (ignoring case) and sort them alphabetically using map.
Write a Python program to transform each string into its reversed uppercase version with duplicates removed using the map() function.

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Python Code Editor:

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