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一入python深似海--list

作者:程力专用汽车股份有限公司 来源:www.chLiw.com 发布时间:2017-09-09 10:22:48
一入python深似海--list

几个实例展示python中数据结构list的魅力!

list变量申明 the_count = [1, 2, 3, 4, 5] fruits = ['apples', 'oranges', 'pears', 'apricots'] change = [1, 'pennies', 2, 'dimes', 3, 'quarters']
访问list元素 array= [1,2,5,3,6,8,4] #其实这里的顺序标识是 (0,1,2,3,4,5,6) (-7,-6,-5,-4,-3,-2,-1)#有负的下标哦 array[0:]#列出index==0以后的 [1,2,5,3,6,8,4] array[1:]#列出index==1以后的 [2,5,3,6,8,4] array[:-1]#列出index==-1之前的 [1,2,5,3,6,8] array[3:-3]#列出index==3到index==-3之间的,注意不包含index==-3,专题,即左闭右开 [3]
list应用 loops and list change = [1, 'pennies', 2, 'dimes', 3, 'quarters'] for i in change: print "I got %r" % i enumerate for i,j in enumerate([[1,2],['o',2],[9,3]]): k1,k2=j print i,k1,k2
output 0 1 2 1 o 2 2 9 3

append/extend/pop/del append()添加元素至list尾部 elements=[1,2,3,4,5] elements.append(6)
extend()拼接两个list list1=[1,2,3,4,5] list2=[6,7] elements.extend(list2) print elements
pop(int i=-1)删除list中指定下标的元素,并返回该位置上的数,default :删除最后一个 elements=[1,2,3,4,5] print elements.pop()#default:delete index==-1,i.e. the last element print elements elements=[1,2,3,4,5] elements.pop(-2)#delete index==-2,i.e. 4 print elements elements.pop(1) print elements
del elements=[1,2,3,4,5] del elements[0]#default:delete index==0,i.e. 1 print elements elements=[1,2,3,4,5] del elements[2:4]#delete index==2 and index==3,i.e.3 and 4 print elements elements=[1,2,3,4,5] del elements#delete all elements
do things to list ten_things = "Apples Oranges Crows Telephone Light Sugar" print "Wait there's not 10 things in that list, let's fix that." stuff = ten_things.split(' ') more_stuff = ["Day", "Night", "Song", "Frisbee", "Corn", "Banana", "Girl", "Boy"] while len(stuff) != 10: next_one = more_stuff.pop() print "Adding: ", next_one stuff.append(next_one) print "There's %d items now." % len(stuff) print "There we go: ", stuff print "Let's do some things with stuff." print stuff[1] print stuff[-1] # whoa! fancy print stuff.pop() print ' '.join(stuff) # what? cool! print '#'.join(stuff[3:5]) # super stellar! outputs:stuff[3]#stuff[4]

' '.join(things) reads as, "Join things with ' ' between them." Meanwhile, join(' ', things) means, "Call join with ' ' and things。返回一个string.
输出 Wait there's not 10 things in that list, let's fix that. Adding: Boy There's 7 items now. Adding: Girl There's 8 items now. Adding: Banana There's 9 items now. Adding: Corn There's 10 items now. There we go: ['Apples', 'Oranges', 'Crows', 'Telephone', 'Light', 'Sugar', 'Boy', 'Girl', 'Banana', 'Corn'] Let's do some things with stuff. Oranges Corn Banana ['Apples', 'Oranges', 'Crows', 'Telephone', 'Light', 'Sugar', 'Boy', 'Girl', 'Corn'] Apples Oranges Crows Telephone Light Sugar Boy Girl Corn Telephone#Light#Sugar


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