What data types are permissible for filling an array?

In Python, arrays (such as lists) can contain elements of any data type, since Python is a dynamically typed language. In a single list, you can store integers, strings, objects, other lists, etc. For example:

arr = [1, "string", 3.14, [1, 2, 3], True]

However, when it comes to the array module, only primitive types specified by type codes are allowed (for example, 'i' for integers, 'f' for floating-point numbers). Arrays from the array module are intended for storing homogeneous data and are more memory-efficient.

Thus, there are no type restrictions for regular lists, but for specialized arrays, only homogeneous primitive types are allowed.