import time

class Timerlog:

    def __init__(self, name):
        self.time_start = 0.0
        self.time_end = 0.0
        self.name = name

    def start(self):
        self.time_start = time.perf_counter()
        return self

    def end(self):
        self.time_end = time.perf_counter()
        return self

    def report(self, duration_only=False):
        if duration_only:
            return "Timer [{}] duration [{:.5f}]".format(
                self.name, self.time_end - self.time_start)
        return "Timer [{}] begin [{:.5f}] end [{:.5f}] duration [{:.9f}]".format(
            self.name, self.time_start, self.time_end, self.time_end - self.time_start)