python：数组/列表（remove()函数、append()函数、sort()函数、reverse()函数）

排序：

1：整理顺序

#冒泡
lista = [5,7,11,19,99,63,3,9,1] list = [] while lista != []: number = 0 for i in lista: if number < i: number = i lista.remove(number) list.append(number) print(list)

打印结果： D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py [99, 63, 19, 11, 9, 7, 5, 3, 1] Process finished with exit code 0

---

#选择
lista = [5,7,11,19,99,63,3,9,1] list = [] while lista != []: for i in lista: number = 1
        for j in lista: if number < j: number = j lista.remove(number) list.append(number) print(list)

打印结果： D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py [99, 63, 19, 11, 9, 7, 5, 3, 1] Process finished with exit code 0

2：sort()函数

#sort函数
lista =[5,7,11,19,99,63,3,9,1] lista.sort() print(lista)

打印结果：
D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py [1, 3, 5, 7, 9, 11, 19, 63, 99] Process finished with exit code 0

3：加上一个数

#若a=18,在原来的list中按顺序加上这个个数
list = [1,4,7,9,11,14,19,34,60,79,98] print("前：%s" %list) a = 18 list.append(a) list_1 = [] while list != []: number = 100
    for i in list: if i < number: number = i list.remove(number) list_1.append(number) print("后：%s" %list_1)

打印结果： D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py 前：[1, 4, 7, 9, 11, 14, 19, 34, 60, 79, 98] 后：[1, 4, 7, 9, 11, 14, 18, 19, 34, 60, 79, 98] Process finished with exit code 0

实例：

3*3表

#3*3表
listx = [1,2,3,] for i in listx: for j in listx: if i >= j: x = i*j print("%s*%s=%s"  %(i,j,x) ,end=" ") print()

打印结果： D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py 1*1=1 
2*1=2 2*2=4 
3*1=3 3*2=6 3*3=9 Process finished with exit code 0

列表反向打印：list_num = ["1","2","3"]打印顺序：3,2,1

使用len（）函数

#反向列表(len() 方法返回对象（字符、列表、元组等）长度或项目个数)
list_num = ["1","2","3"] i = len(list_num) print(list_num[i-1::-1])

打印结果：
D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py ['3', '2', '1'] Process finished with exit code 0

使用reverse()函数

list_num = ["1","2","3"] list_num.reverse() print(list_num)

打印结果： D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py ['3', '2', '1'] Process finished with exit code 0

使用for语句

a = [1,2,3,4,5,6] num = len(a) for i in range(int(num/2)): a[i],a[num -i -1 ] = a[num-i-1],a[i] print(a)

D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py [6, 5, 4, 3, 2, 1] Process finished with exit code 0

小知识：

list_num = ["1","2","3"] for i in list_num[::-1]:#从后往前取值
    print(i)

打印结果： D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py 3
2
1 Process finished with exit code 0