Python內建型別效能分析

timeit模組可以用來測試一小段python**的執行速度。

timer是測量小段**執行速度的類。

class timeit.timer(stmt='

pass
', setup='
pass
', timer=)
stmt引數是要測試的**語句（statment）；
setup引數是執行**時需要的設定；
timer引數是乙個定時器函式，與平台有關。

timer物件.timeit(number=1000000)

timer類中測試語句執行速度的物件方法。number引數是測試**時的測試次數，預設為1000000次。方法返回執行**的平均耗時，乙個float型別的秒數。

#

-*- coding:utf-8 -*-
import
timeit
deft2():
li =
for i in range(10000):
li.insert(0, i)
deft0():
li =
for i in range(10000):
li.extend([i])
deft1():
li =
for i in range(10000):
deft3():
li =
for i in range(10000):
li +=[i]
deft3_1():
li =
for i in range(10000):
li = li +[i]
deft4():
li = [ i for i in range(10000)]
deft5():
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("
", 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
")

執行結果：

insert 18.678989517seconds
extend 1.022223395000001seconds
+= 0.773258104seconds
+加法 126.929554195seconds
[i for i in range()] 0.36483252799999377seconds
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')

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