Question

python如何实现计时？

请详细讲解一下，第一天接触python，完全新手，复杂的指令什么的请务必解说一下。。
要求：total_time定义成时间，程序一开始则从零开始，然后按照现实的时间，以秒为单位进行计时，程序中加入操作（简单的比如
your_name = raw_input("please input your name:\n")
hint = "hello, %s, how are you?" %your_name
print hint
）
然后在print hint的同时截止计时，print total_time.

Answer 1

用python实现计时器功能，代码如下：
''' Simple Timing Function.
This function prints out a message with the elapsed time from the
previous call. It works with most Python 2.x platforms. The function
uses a simple trick to store a persistent variable (clock) without
using a global variable.
'''
import time
def dur( op=None, clock=[time.time()] ):
if op != None:
duration = time.time() - clock[0]
print '%s finished. Duration %.6f seconds.' % (op, duration)
clock[0] = time.time()
# Example
if __name__ == '__main__':
import array
dur() # Initialise the timing clock
opt1 = array.array('H')
for i in range(1000):
for n in range(1000):
opt1.append(n)
dur('Array from append')
opt2 = array.array('H')
seq = range(1000)
for i in range(1000):
opt2.extend(seq)
dur('Array from list extend')
opt3 = array.array('H')
seq = array.array('H', range(1000))
for i in range(1000):
opt3.extend(seq)
dur('Array from array extend')
# Output:
# Array from append finished. Duration 0.175320 seconds.
# Array from list extend finished. Duration 0.068974 seconds.
# Array from array extend finished. Duration 0.001394 seconds.

Answer 2

import time
time1= time.time()
your_name = raw_input("please input your name:\n")
hint = "hello, %s, how are you?" %your_name
print hint
time2= time.time()
print time2-time1

追问

这是通过time2-time1来实现计时的，但是需要程序进行这么一项操作，其实我想要实现的是的是时刻都在计时，然后我
while 1：
if total_time==150（随便设得数值）
什么什么操作
else
break
.

这样的话，是不是程序时时刻刻都在运行，会不会很占资源什么之类的？

Answer 3

start = datetime.datetime.now()
你的function

end = datetime.datetime.now()
print end-start
end-start就是你程序的执行时间