Learning notes for Python/002-3 (2018-5-20)

Cluster Type

Cluster Type	List	Meta-group	Dictionary	Collection
	List	Tuple	Dict	Set

1. List
The type of list, which is ordered, has an index, and the content and length can be changed. To create a list, you can use the [] direct notation, with each element in the list separated by commas.
Common actions for lists
(1) Sectioning of elements

names=["Zhangfei","Guanyu","Liubie","Zhaoyun","Machoa","Jiangwei","Mashu","Zhaoyun"]print(names)print(names[0])    # 切位置0的元素print(names[0:4])  #  切出位置0~3的元素print(names[-1])     # 切出最后一位的元素print(names[-3:])     # 切片，左取右不取``print(names[0:-1:2])    # 有间隔的切片for i in names:    print(i)           # 循环的切片方法，这个i就代表了列表中的元素

(2) Increase, change and deletion of the list
Names.append (); Names.insert (); Names.remove (); Names.pop ()

names=["Zhangfei","Guanyu","Liubie","Zhaoyun","Machoa","Jiangwei","Masu","Zhaoyun"]print(names)names.append("Zhugelaing")   # [增]-----在列表末尾  追加  诸葛亮print(names)names.insert(3,"daqiao")       # [增]-----在列表中的位置3  插入  大乔print(names)names[2]="zhouyu"            #[改]----- 将刘备  替换  为周瑜print(names)   # names.remove("Masu")      # [删]-----删除 马谡 (有三种常用的方法)# del names[-3]print(names.pop(-3))print(names)

(3) List of check, statistics
Names.index (); Names.count ()

names=["Zhangfei","Guanyu","Liubie","Zhaoyun","Machoa","Jiangwei","Masu","Zhaoyun"]print(names)print(names.index("Zhaoyun"))         # 获取下标，赵云有俩个但是却只查到了列表里的第一个？？？？print(names[names.index("Zhaoyun")])print(names.count("Zhaoyun") )     #   统计  列表中赵云的个数

(4) List reversal, sorting, merging
Names.reverse (); Names,sort (); Names.extend ()

names=["Zhangfei","Guanyu","Liubie","Zhaoyun","Machoa","Jiangwei","Masu","Zhaoyun"]print(names)names.reverse()    #  将列表  反转print(names)names.sort()    # 将列表按照默认的utf-8格式  排序print(names)names2=["Chaochao","Simayi","Diewei","Xiahuodong","Xuchu"]names.extend(names2 )       #  合并俩个列表，但是合并的列表仍然存在print(names)

(5) Copy of list
Names.copy (); Copy.copy (); Copy.deepcopy ()

import copy  # 需要为深copy引入模块names=["Zhangfei","Guanyu","Liubie","Zhaoyun",["zhouyu","daqiao"],"Machoa","Jiangwei","Masu","Zhaoyun"]names1=names    #  完全就是二者相等names2=names.copy()   # 浅copy，第二个列表里其实copy的是一个地址，可以用来实现一个联合账户的功能names3=copy.copy(names) # 三种不同的实现方法names4=names[:]names5=copy.deepcopy(names)   #  深copy一般不用因为会占用更多的空间names[2]="刘邦"     #  将位置2的元素改为刘邦names[4][0]="小乔"   # 将位置4列表里的位置0元素改为大乔print(names)   # 比较几种不同的复制print(names1)print(names2)print(names3)print(names4)print(names5)

(6) Cleanup of the list
Names.clear ()

names=["Zhangfei","Guanyu","Liubie","Zhaoyun","Machoa","Jiangwei","Masu","Zhaoyun"]print(names)names.clear()print(names)

Learning notes for Python/002-3 (2018-5-20)