讀取列表

列表：由一系列按特定順序排列的元素組合。Python中使用“[]”表示列表

bicycles = ['trek','cannondale','redline','specialized']

#讀取所有列表

print(bicycles)

['trek', 'cannondale', 'redline', 'specialized']

#讀取指定列表

print(bicycles[0])

trek

#讀取指定列表,指定單詞首字母大寫

print(bicycles[0].title())

Trek

列表操作

列表命名規則：name = [] 列表下標：[0,1,2,3....] 或 [...-3,-2,-1]

names = ["zhangsan","lisi","wangwu","maliu"]

查詢列表

#顯示列表

print(names)

['zhangsan', 'lisi', 'wangwu', 'maliu']

#取下標“0”的值===切片

print(names[0])

zhangsan

#連續的正向取值,"1,2,3"，取值規則顧頭不顧尾,順序左到右===切片

print(names[1:4])

['lisi', 'wangwu', 'maliu']

#連續的逆向取值，“-2，-1”===切片

print(names[-2:])

['wangwu', 'maliu']

#連續的逆向取值，“-2”顧頭不顧尾===切片

print(names[-2:-1])

['wangwu']

#連續的逆向取值，“0,1,2”顧頭不顧尾===切片

print(names[0:3])

print(names[:3])

['zhangsan', 'lisi', 'wangwu']

['zhangsan', 'lisi', 'wangwu']

#查詢列表長度

print(len(names))

print(names)

4

['zhangsan', 'lisi', 'wangwu', 'maliu']

#查詢參數的下標位

print(names.index("zhangsan"))

0

#統計參數個數

print(names.count("zhangsan"))

1

#反轉列表

names.reverse()

print(names)

['maliu', 'wangwu', 'lisi', 'zhangsan']

#規則排序，特殊字符====數字===大寫===小寫

names.sort() print(names)

['lisi', 'maliu', 'wangwu', 'zhangsan']

#清空列表

print(names.clear())

增加列表

name = []

names = ["zhangsan","lisi","wangwu","maliu"]

# 追加參數

names.append("xiaoqi")

print(names)

['zhangsan', 'lisi', 'wangwu', 'maliu',?'xiaoqi']

# 指定位置增加參數

names.insert(1, "xiaoqi") print(names)

['zhangsan',?'xiaoqi', 'lisi', 'wangwu', 'maliu', 'xiaoqi']

# 列表擴展

names2 = ["123", "234"] names.extend(names2) print(names)

['zhangsan', 'xiaoqi', 'lisi', 'wangwu', 'maliu', 'xiaoqi',?'123', '234']

刪除列表

name = []

names = ["zhangsan","lisi","wangwu","maliu"]

print(names)

['zhangsan', 'lisi', 'wangwu', 'maliu']

# 替換指定參數

names[2] = "xiaoqi"

print(names)

['zhangsan', 'lisi',?'xiaoqi', 'maliu']

# 刪除指定參數

names.remove("zhangsan")

print(names)

['lisi', 'xiaoqi', 'maliu']

# 默認刪除最后一個，輸入下標刪除下標位

names.pop()

print(names)

['lisi', 'xiaoqi']

# 刪除變量

names2 = ["123", "234"]

del names2

復制列表

#淺copy，僅復制第一層列表

names = ["zhangsan","lisi","wangwu","maliu"]

name2 = names.copy()

#完全復制一層列表

print(names)

['zhangsan', 'lisi', 'wangwu', 'maliu']

names[0] = "lili"

print(names)

['lili', 'lisi', 'wangwu', 'maliu']

print(name2)

['zhangsan', 'lisi', 'wangwu', 'maliu']

#淺copy，對第二層列表完全讀取

names = ["zhangsan","lisi",["zhangsan","lisi"],"wangwu","maliu"]

name2 = names.copy()

#完全復制第一層列表

names [2][1] = "LLLL"

print(names)

["zhangsan","lisi",["zhangsan","LLLL"],"wangwu","maliu"]

print(name2)

["zhangsan","lisi",["zhangsan","LLLL"],"wangwu","maliu"]

copy模塊

#深copy，完全克隆

import copy

names = ["zhangsan","lisi",["zhangsan","lisi"],"wangwu","maliu"]

name2 = copy.deepcopy(names)

#完全復制一層列表

names [2][1] =?"LLLL"

print(names)

["zhangsan","lisi",["zhangsan","LLLL"],"wangwu","maliu"]

print(name2)

["zhangsan","lisi",["zhangsan","lisi"],"wangwu","maliu"]

列表循環

names = ["zhangsan", "lisi", "wangwu", "maliu","zhaoliu"]

# 步長切片 for i in names:print(i) print(names[0:-1:2]) print(names[::2])

zhangsan

lisi

wangwu

maliu

zhaoliu

['zhangsan', 'wangwu']

['zhangsan', 'wangwu', 'zhaoliu']

創建數字列表

#創建2-11,步長為2的數字列表“numb”

numb = list(range (2,11,2))

print(numb)

[2, 4, 6, 8, 10]

數字列表簡單計算

numb = list(range (0,10))

print(numb)

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

#列表取最小值

print(min(numb))

0

#列表取最大值

print(max(numb))

9

#列表求和

print(sum(numb))

45

轉載于:https://www.cnblogs.com/jorbabe/p/8544436.html

總結

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