How to Remove Duplicate Characters from a String in Python?

Removing Duplicate Characters from a String

In Python, eliminating duplicate characters from a string is a straightforward task. When the order of the characters is irrelevant, consider the following approach:

Using a set, you can create a representation of the string with only unique characters. Subsequently, join the elements of this set back into a string using "".join(). This solution preserves the order of the characters, resulting in arbitrary ordering.

<code class="python">foo = 'mppmt'
unique_foo = "".join(set(foo))  # 'mpt'
print(unique_foo)</code>

However, if maintaining the original character order is essential, a more nuanced solution is necessary. By employing a dictionary, you can retain the insertion order of the characters.

<code class="python">foo = 'mppmt'
unique_characters = {}
for char in foo:
    unique_characters[char] = True
result = ''.join(unique_characters.keys())  # 'mpt'
print(result)</code>

This modified approach utilizes a dictionary to preserve the character order, ensuring that the resulting string maintains the same sequence.

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