python: array/list (remove() function, append() function, sort() function, reverse() function)

Sort:

1: Sort order

#bubble 
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)

print result:
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

---

#select 
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)

print result:
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() function

#sort function 
lista =[5,7,11,19,99,63,3,9,1 ]
list.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