Which of these data types takes up less memory — list or tuple?

Tuples occupy less memory than lists in Python. This is because tuples are immutable, and their structure is more compact since they do not require additional space to support modification operations (such as adding or removing elements).

Example of comparison:

import sys

lst = [1, 2, 3, 4]
tpl = (1, 2, 3, 4)

print(sys.getsizeof(lst))  # for example, 88 bytes
print(sys.getsizeof(tpl))  # for example, 72 bytes

Thus, if data does not require modifications, using tuples helps save memory.