What is the output of the following tuple modification attempt?
t = ([1, 2], 3)
t[0].append(4)
print(t)
Although the tuple structure itself is immutable, the element at t[0] is a mutable list object. Calling .append(4) mutates the inner list successfully to [1, 2, 4].
Evaluate the result of len({1, '1', 1.0, (1,)}):
1 and 1.0 are equal and collapse into 1 set element. '1' (str) and (1,) (tuple) are distinct types/values. Total elements = 3 (1, '1', (1,)).
What is the average time complexity for searching a key in a Python dict?
Python dictionaries use hash tables internally, providing average O(1) time complexity for lookup, insertion, and deletion.
What integer is printed by the following dictionary method call?
d = {'a': 10, 'b': 20}
print(d.setdefault('c', 99) + d.setdefault('a', 50))d.setdefault('c', 99) inserts key 'c' with value 99 and returns 99. d.setdefault('a', 50) key 'a' exists with value 10, so returns existing value 10. 99 + 10 = 109.
What is the result of the expression set('banana')?
Constructing a set from string 'banana' extracts distinct unique characters: 'b', 'a', and 'n'.