python记录程序运行时间的方法介绍

import datetime
  def time_1():
    begin = datetime.datetime.now()
     sum = 0
   for i in xrange(10000000):
     sum = sum + i
   end = datetime.datetime.now()
    return end-begin
 print time_1()

➜  Python python time_1.py
0:00:00.280797

import datetime
starttime = datetime.datetime.now()
#long running
endtime = datetime.datetime.now()
print (endtime - starttime).seconds

start = time.time()
run_fun()
end = time.time()
print end-start

start = time.clock()
run_fun()
end = time.clock()
print end-start