What is the main difference between array and list data structures in Python?

The main difference between arrays and lists in Python lies in their structure and capabilities:

• Arrays (array module):

  • Store elements of the same type (e.g., only integers).
  • More efficient in memory and speed when working with large volumes of homogeneous data.
  • Require importing the array module.

• Lists:

  • Can contain elements of different types.
  • More flexible, support many operations (adding, removing, sorting, etc.).
  • Used by default, built-in type.

Example:

import array

# Array of integers
arr = array.array('i', [1, 2, 3])

# List with different types
lst = [1, 'two', 3.0]

Thus, arrays are suitable for optimized storage of homogeneous data, while lists are more versatile for working with collections.