test-any.py

import timeit

files = [f"file{i}" for i in range(300)]

def has_spec_for(files):
    for file in files:
        if file.endswith(".spec"):
            return True
    return False

def has_spec_any(files):
    return any(file.endswith(".spec") for file in files)

files[10] = "file.spec"
print("for loop, spec-file file in the beginning of the list:", timeit.timeit(lambda: has_spec_for(files)))
print("any, spec-file file in the beginning of the list:", timeit.timeit(lambda: has_spec_any(files)))

files[10] = "file10"
files[100] = "file.spec"
print("for loop, spec-file file in the middle of the list:", timeit.timeit(lambda: has_spec_for(files)))
print("any, spec-file file in the middle of the list:", timeit.timeit(lambda: has_spec_any(files)))