Minimum-number-of-taxis.py

def min_num_taxis (requests):
    pu , do = zip (*requests)
    counter = 0
    pu_list , do_list = [ x for x in pu ] , [ x for x in do ]
    pu_list.sort ()
    do_list.sort ()
    for element in pu_list:
        if element <= do_list[ 0 ]:
            counter += 1
        else:
            del do_list[ 0 ]

    return counter