Python内置类型性能分析过程实例

# -*- coding:utf-8 -*-

import timeit

def t2():
  li = []
  for i in range(10000):
    li.insert(0, i)

def t0():
  li = []
  for i in range(10000):
    li.extend([i])

def t1():
  li = []
  for i in range(10000):
    li.append(i)

def t3():
  li = []
  for i in range(10000):
    li += [i]

def t3_1():
  li = []
  for i in range(10000):
    li = li + [i]

def t4():
  li = [ i for i in range(10000)]

def t5():
  li = list(range(10000))


timer2 = timeit.Timer(stmt="t2()", setup="from __main__ import t2")
print("insert", timer2.timeit(number=1000), "seconds")

timer0 = timeit.Timer(stmt="t0()", setup="from __main__ import t0")
print("extend", timer0.timeit(number=1000), "seconds")

timer1 = timeit.Timer(stmt="t1()", setup="from __main__ import t1")
print("append", timer1.timeit(number=1000), "seconds")

timer3 = timeit.Timer(stmt="t3()", setup="from __main__ import t3")
print("+=", timer3.timeit(number=1000), "seconds")

timer3_1 = timeit.Timer(stmt="t3_1()", setup="from __main__ import t3_1")
print("+加法", timer3_1.timeit(number=1000), "seconds")

timer4 = timeit.Timer(stmt="t4()", setup="from __main__ import t4")
print("[i for i in range()]", timer4.timeit(number=1000), "seconds")

timer5 = timeit.Timer(stmt="t5()", setup="from __main__ import t5")
print("list", timer5.timeit(number=1000), "seconds")

执行结果：

insert 18.678989517 seconds
extend 1.022223395000001 seconds
append 0.6755100029999994 seconds
+= 0.773258104 seconds
+加法 126.929554195 seconds
[i for i in range()] 0.36483252799999377 seconds
list 0.19607099800001038 seconds

x = range(2000000)
pop_zero = Timer("x.pop(0)","from __main__ import x")
print("pop_zero ",pop_zero.timeit(number=1000), "seconds")

x = range(2000000)
pop_end = Timer("x.pop()","from __main__ import x")
print("pop_end ",pop_end.timeit(number=1000), "seconds")

# ('pop_zero ', 1.9101738929748535, 'seconds')
# ('pop_end ', 0.00023603439331054688, 'seconds')