How to Eliminate Duplicate Characters from Strings while Preserving Character Order in Python?

Eliminating Duplicate Characters from Strings in Python

Question:

To remove duplicate characters from a string in Python, let's consider the example of converting "mppmt" to "mpt." How can we achieve this transformation?

Answer:

If the order of characters is irrelevant, we can employ the following method:

<code class="python">"".join(set(foo))</code>

Here, set() generates a collection of unique characters from the original string, and "".join() reconstructs the string from these unique elements, arranging them in an arbitrary order.

However, preserving the original character order is crucial in certain situations. To account for this, we can utilize a dictionary rather than a set, leveraging its feature to maintain insertion order in Python versions 3.7 and above:

<code class="python">foo = "mppmt"
result = "".join(dict.fromkeys(foo))</code>

This approach yields the desired string "mpt." Similarly, in Python versions earlier than 3.7, we can utilize collections.OrderedDict, which was introduced in Python 2.7, to achieve the same result.

The above is the detailed content of How to Eliminate Duplicate Characters from Strings while Preserving Character Order in Python?. For more information, please follow other related articles on the PHP Chinese website!