How to Efficiently Convert a List of Strings to Integers in Python?

Converting List Elements from Strings to Integers

Question:

How can we efficiently convert all elements within a list of strings to integers?

Answer:

To achieve this conversion, a simple combination of the map() and list() functions can be employed. Here's a breakdown of the process:

Using map():

The map() function applies a specified function to each element of an iterable. In this case, we want to apply the int() function to each string in the list. The int() function converts a string representation of an integer into an actual integer value.

list_of_strings = ['1', '2', '3']
list_of_mapped_data = map(int, list_of_strings)

After using map(), list_of_mapped_data contains an iterable of integer values. However, it is not yet a list.

Converting to a List:

To obtain a list of integers, we need to apply the list() function to the list_of_mapped_data iterable. This converts it into a regular list.

list_of_integers = list(map(int, list_of_strings))

Example:

Consider the list xs = ['1', '2', '3'].

list_of_integers = list(map(int, xs))

The result will be a list of integers: [1, 2, 3]

Python 2 Compatibility:

In Python 2, the map() function returned a list by default, so the list() function was unnecessary. The following code would have been sufficient:

list_of_integers = map(int, xs)

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