python编写记时函数的简单介绍
python如何实现计时?
用python实现计时器功能,代码如下:
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''' 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.
python怎么计时
定义在默认的计时器中,针对不同平台采用不同方式。在Windows上,time.clock()具有微秒精度,但是time.time()精度是1/60s。在Unix上,time.clock()有1/100s精度,而且time.time()精度远远更高。在另外的平台上,default_timer()测量的是墙上时钟时间,不是CPU时间。这意味着同一计算机的其他进程可能影响计时
版权声明:
def clock(func):
def clocked(*args, **kwargs):
t0 = timeit.default_timer()
result = func(*args, **kwargs)
elapsed = timeit.default_timer() - t0
name = func.__name__
arg_str = ', '.join(repr(arg) for arg in args)
print('[%0.8fs] %s(%s) - %r' % (elapsed, name, arg_str, result))
return result
return clocked
@clock
def run(seconds):
time.sleep(seconds)
return time
if __name__ == '__main__':
run(1)
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怎么用python写倒计时的代码
import time
time=int(input('倒计时时间(分)'))
b=time*60
for i in range(b):
print('%d分%d秒'%(b/60,b%60))
time.sleep(1)
b-=1
python怎么对列表操作计时
python对列表计时的方法:
使用“import”语句导入time包,在列表操作之前用time.time函数获取当前时间,在列表操作之后,再用time.time获取当前时间,用第二次的时间减去第一次的时间就可以了
示例如下:
执行结果如下:
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Python2.7.13怎么编计时器
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.
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