from time import clock
import datetime


"""
"""
class Timer:
	def __init__(self):
		self.start_t = datetime.datetime.now()

	def start(self):
		self.start_t = datetime.datetime.now()

	def end(self):
		self.end_t = datetime.datetime.now()

	def elapsed(self):
		if self.end_t is None or self.start_t is None:
			print >>sys.stderr, "Tempo nao medido corretamente."
			return None
		return (self.end_t - self.start_t).microseconds

4e76851ce7a02cf05d1b22e464989605e82806a3
<mask token>


class Timer:
    <mask token>

    def start(self):
        self.start_t = datetime.datetime.now()

    def end(self):
        self.end_t = datetime.datetime.now()
    <mask token>

<mask token>


class Timer:
    <mask token>

    def start(self):
        self.start_t = datetime.datetime.now()

    def end(self):
        self.end_t = datetime.datetime.now()

    def elapsed(self):
        if self.end_t is None or self.start_t is None:
            print >> sys.stderr, 'Tempo nao medido corretamente.'
            return None
        return (self.end_t - self.start_t).microseconds

<mask token>


class Timer:

    def __init__(self):
        self.start_t = datetime.datetime.now()

    def start(self):
        self.start_t = datetime.datetime.now()

    def end(self):
        self.end_t = datetime.datetime.now()

    def elapsed(self):
        if self.end_t is None or self.start_t is None:
            print >> sys.stderr, 'Tempo nao medido corretamente.'
            return None
        return (self.end_t - self.start_t).microseconds

from time import clock
import datetime
<mask token>


class Timer:

    def __init__(self):
        self.start_t = datetime.datetime.now()

    def start(self):
        self.start_t = datetime.datetime.now()

    def end(self):
        self.end_t = datetime.datetime.now()

    def elapsed(self):
        if self.end_t is None or self.start_t is None:
            print >> sys.stderr, 'Tempo nao medido corretamente.'
            return None
        return (self.end_t - self.start_t).microseconds

from time import clock
import datetime


"""
"""
class Timer:
	def __init__(self):
		self.start_t = datetime.datetime.now()

	def start(self):
		self.start_t = datetime.datetime.now()

	def end(self):
		self.end_t = datetime.datetime.now()

	def elapsed(self):
		if self.end_t is None or self.start_t is None:
			print >>sys.stderr, "Tempo nao medido corretamente."
			return None
		return (self.end_t - self.start_t).microseconds
