from timeit import Timer def t1(): li = [] for i in range(10000): li.append(i) def t2(): li = [] for i in range(10000): li += [i] def t3(): li = [i for i in range(10000)] def t4(): li = list(range(10000)) if __name__ == '__main__': # 参数1运行语句,参数二导包. t…
Python方法oslo_service.loopingcall.LoopingCallDone代码示例 demo: from oslo_service import loopingcall def _wait_for_image_state(): global num num = def _wait_for_state(): global num print num num = num + if num == : raise loopingcall.LoopingCallDone() time…
import timeit def test(): lista = [] listb = [] for i in range(100): lista.append(i) for i in range(100): listb.append(i) return lista, listb def test1(): a, b = test() return len(a) == len(b) and sorted(a) == sorted(b) T = timeit.timeit(stmt="test()…
Python 2.7.10 (default, Oct 14 2015, 16:09:02) [GCC 5.2.1 20151010] on linux2 Type "copyright", "credits" or "license()" for more information. >>> def fun1(): return [1,2,3] >>> print(fun1) <function fun1…
之前只知道设置变量的初始值为0.今天在写网络路径分析的时候,为了找到离任意坐标距离最近的节点,初始设置最短距离为无穷大,然后不断的去替换,直到找到最近的节点. 刚开始设置是min_dis = 999999999999,作为距离不是特别大的也是可以的,于是试想是不是Python提供了有无穷大的表示方法,查阅文档,果然如此: from random import randrange seq = [randrange(10**10) for i in range(100)] dd = float("i…
1.像(),[],{}这三个是可以通过bool(()),bool([]),bool({})转化为bool值的:且它们转化后的结果为False.但是这三个值它本身并不等于False.切记不可以与False 直接进行比较. #!/usr/bin/python #!coding:utf-8 import sys if __name__ =="__main__": falseList=[0,False,'',(),[],{}] print("the list is :[[0,Fals…
