How to Convert Comma-Delimited Strings to Lists in Python?

Converting Comma-Delimited Strings to Lists in Python

When working with textual data, it's often necessary to extract specific values from strings. Comma-separated values (CSVs) are a common format for storing multiple values in a single string. To leverage CSVs effectively, you need to be able to convert them into more manageable data structures, such as lists.

Problem Statement

Convert a comma-delimited string into a Python list, transforming values like "A,B,C,D,E" into ['A', 'B', 'C', 'D', 'E'].

Solution Using str.split

The str.split method provides a convenient way to split a string by a given delimiter, in this case, a comma. The resulting list contains individual elements that were originally separated by commas.

<code class="python">mStr = 'A,B,C,D,E'
mList = mStr.split(",")
print(mList)  # Output: ['A', 'B', 'C', 'D', 'E']</code>

Converting to Tuples

If you wish to create a tuple instead of a list, simply apply the tuple() function to the split result:

<code class="python">myTuple = tuple(mList)
print(myTuple)  # Output: ('A', 'B', 'C', 'D', 'E')</code>

Appending to an Existing List

To append comma-separated values to an existing list, use the append() method:

<code class="python">myList = ['A', 'B', 'C']
myList.append('D,E')
print(myList)  # Output: ['A', 'B', 'C', 'D,E']</code>

Alternatively, you can use the extend() method to append each individual value:

<code class="python">myList.extend(['D', 'E'])
print(myList)  # Output: ['A', 'B', 'C', 'D', 'E']</code>

Now you have the tools to efficiently convert comma-delimited strings into Python lists, tuples, or extend existing lists with new values.

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