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