列表

#列表

names = ["aaa","bbb","ccc","ddd","eee","fff"]

#切片

1 print(names[0],"【1】")   #取第一个值
2 print(names[1:3],"【-2】") #顾头不顾尾，忽略最后一个值
3 print(names[-3:-1],"【-3】") #负数还是从左到右边，一样忽略最后一个值
4 print(names[-3:],"【-4】")   #取-3右边的所有值

#追加

1 names.append("fff") #追加
2 print(names,"【-5】")

#指定插入数据位置

1 names.insert(2,"gdr") #2原本为“ccc”的位置，插入“gdr”，依次往后靠
2 print(names,"【-6】")

#列表删除

1 names.remove("aaa")
2 print(names,"【-7】")
3 
4 del names[2]  #和names.pop(2)一样
5 print(names,"【-8】")

#查询位置

1 print(names.index("fff"),"【-9】")
2 print(names[names.index("fff")],"【-10】")

#统计重复值

print(names.count("fff"),"【-11】")

#列表多级和复制

1 names_2 = ["aaa",["haohao","zhuzhu"],"xxx"]
2 names_3 = names_2.copy()
3 names_2[0] = "大大"
4 names_2[1][0] = "大大二二"
5 print(names_2,"【-12】")
6 print(names_3,"【-13】")

#导入模块复制

1 import copy
2 names_4 = copy.copy(names_2)
3 print(names_4,"【-14】")

#列表循环

1 for i in names:
2     print("---",i,"---")

#列表步长

print(names[::2])

所有输出结果：

 1 aaa 【1】
 2 ['bbb', 'ccc'] 【-2】
 3 ['ddd', 'eee'] 【-3】
 4 ['ddd', 'eee', 'fff'] 【-4】
 5 ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff', 'fff'] 【-5】
 6 ['aaa', 'bbb', 'gdr', 'ccc', 'ddd', 'eee', 'fff', 'fff'] 【-6】
 7 ['bbb', 'gdr', 'ccc', 'ddd', 'eee', 'fff', 'fff'] 【-7】
 8 ['bbb', 'gdr', 'ddd', 'eee', 'fff', 'fff'] 【-8】
 9 4 【-9】
10 fff 【-10】
11 2 【-11】
12 ['大大', ['大大二二', 'zhuzhu'], 'xxx'] 【-12】
13 ['aaa', ['大大二二', 'zhuzhu'], 'xxx'] 【-13】
14 ['大大', ['大大二二', 'zhuzhu'], 'xxx'] 【-14】
15 --- bbb ---
16 --- gdr ---
17 --- ddd ---
18 --- eee ---
19 --- fff ---
20 --- fff ---
21 ['bbb', 'ddd', 'fff']

View Code

#copy补充

 1 names = ["name",["job",1000]]
 2 #复制列表
 3 p1 = names[:]
 4 p2 = names[:]
 5 #修改P1,P2的值
 6 p1[0] = "gdr"
 7 p2[0] = "dj"
 8 
 9 p1[1][1] = 50
10 #打印查看结果
11 print(p1)
12 print(p2)

输出结果：

1 ['gdr', ['job', 50]]
2 ['dj', ['job', 50]]