import re
import subprocess
import timeit
from typing import List


def print_sections(manpage_lines):
    sections = []
    for line in manpage_lines:
        if re.match("^([A-Z]{2,})", line):
            sections.append(re.match("^([A-Z]{2,})", line).group())
    return sections


def main():
    man = subprocess.check_output(["man", "man"]).decode("utf-8").split()
    print(print_sections(man))


main()

# und nun die Messung
man_man = subprocess.check_output(["man", "man"]).decode("utf-8")

duration = timeit.timeit(lambda: print_sections(man_man), number=100)

print("Durchschnittliche Laufzeit in Sekunden:", duration)