Python time.clock在Python3.3废弃，在Python3.8中将被移除

 报错：

DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be removed from Python 3.8: use time.perf_counter or time.process_time instead

clock使用：

from time import clock
def timer(f):
    def _f(*args):
        t0 = clock()
        f(*args)
        return clock() - t0
    return _f

应用：

#定义100000000个都为5的元素
x = [5] * 100000000
print(x[0])
print(x[99999999])
print(len(x))

#定义一个方法删除指定位置的元素
def delete_elem(x, index):
    del x[index]

timer(delete_elem)(x,-1)
timer(delete_elem)(x,0)

结果： 

提倡的新方法：

perf_counter使用方法：

from time import perf_counter
def timer_2(f):
    def _f(*args):
        t0 = perf_counter()
        f(*args)
        return perf_counter() - t0
    return _f

应用： 

timer_2(delete_elem)(x,-1)
timer_2(delete_elem)(x,0)

结果： 

process_time使用方法：

from time import process_time
def timer_3(f):
    def _f(*args):
        t0 = process_time()
        f(*args)
        return process_time() - t0
    return _f

应用： 

timer_3(delete_elem)(x,-1)
timer_3(delete_elem)(x,0)

结果：