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 = ["","",""]

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

['', '', '']

Process finished with exit code 0

使用reverse()函数

list_num = ["","",""]

list_num.reverse()

print(list_num)

打印结果：

D:\untitled\1\venv\Scripts\python.exe D:/untitled/1/venv/main.py

['', '', '']

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 = ["","",""]

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

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