Time-testing various ways to check if all items in a list are the same value

all_are_equal_timing_tests.py

from timeit import timeit

all_are_equal_functions = [
    lambda numbers: all(a == b for a, b in zip(numbers, numbers[1:])),
    lambda numbers: all(number == numbers[0] for number in numbers),
    lambda numbers: len([number for number in numbers if number != numbers[0]]) == 0,
    lambda numbers: len(set(numbers)) <= 1,
    lambda numbers: not numbers or numbers.sort() or numbers[0] == numbers[-1],
    lambda numbers: not numbers or numbers == ([numbers[0]] * len(numbers)),
    lambda numbers: not numbers or numbers.count(numbers[0]) == len(numbers),
]

# Run a few tests on each function to verify they are valid
input_output_test_tuples = [
    ([], True),
    ([1], True),
    ([1, 1], True),
    ([1, 2, 3], False)
]

for all_are_equal_function in all_are_equal_functions:
    for test_input, test_output in input_output_test_tuples:
        assert all_are_equal_function(test_input) == test_output
    
# Actual timing tests
numbers = [1] * 10_000

for all_are_equal_function in all_are_equal_functions:
    timing = timeit(lambda: all_are_equal_function(numbers), number=10_000)
    print(f"{round(timing, 2)} seconds")