How to Convert Nested Lists of Strings to Integers in Python?

Converting Strings in Nested Lists to Integers

In Python, converting strings to integers can be done using the built-in int() function. This function takes a string representation of a number as an argument and returns the corresponding integer value.

To convert the elements of a nested list of strings to integers, we can use a list comprehension. In Python 3, the following code can be used:

T1 = (('13', '17', '18', '21', '32'),
      ('07', '11', '13', '14', '28'),
      ('01', '05', '06', '08', '15', '16'))

T2 = [list(map(int, x)) for x in T1]

This code iterates over each inner list in T1 and applies the map() function to each element using int to convert the string elements to integers. The result is a new list of lists containing the converted integers.

In Python 2, the same conversion can be achieved using the map() function directly:

T2 = [map(int, x) for x in T1]

This code also iterates over the inner lists in T1 but uses the map() function to convert the elements to integers. It returns a list of iterables, so it needs to be cast to a list of lists explicitly.

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