The Python list creation, features, add, delete, etc.

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This link: https://blog.csdn.net/Leslie_qlh/article/details/100586792

1. Create a list

数组:存储同一种数据类型的集合 scores = [34,56,90,100..]
列表(打了激素的数组):可以存储任意数据类型
"""
list = [1,1.2,True,'westos']
print(list,type(list))

# 列表里面也可以嵌套列表

list2 = [1,1.2,True,'westos',[1,2,3,4]]
print(list2,type(list2))

2. The list of properties

service = ['http','ftp','ssh']

# 索引

# 正向索引

print(service[0])

# 反向索引

print(service[-1])

# 切片

print(service[::-1])
print(service[1:])
print(service[:-1])

# 重复

print(service * 3)

# 连接

service1 = ['mysql','firewalld']
print(service + service1)

# 成员操作符

print('firewalld' in service)
print('ftp' not in service1)

3. List the elements increase

service = ['http','ftp','ssh']

# append():追加一个元素到列表

service.append('firewalld')

# extend():拉伸 追加多个元素到列表

service.extend(['mysql','nfs'])

# insert():在指定索引处插入元素

service.insert(1,'https')

4. Delete list elements

 >>> service = ['http','ftp','ssh']

 >>> service.pop()

 'ssh'

 >>> service

 ['http', 'ftp']

 >>> service.pop()

 'ftp'

 >>> service

 ['http']

 >>> service = ['http','ftp','ssh']

 >>> service

 ['http', 'ftp', 'ssh']

 >>> service.pop(0)

 'http'

 >>> service

 ['ftp', 'ssh']

 >>> service.pop()

 'ssh'

 >>> service

 ['ftp']

 >>> service.pop()

 'ftp'

 >>> service

 []

 >>> service.pop()

 Traceback (most recent call last):

 File "<stdin>", line 1, in <module>

 IndexError: pop from empty list

remove (): Delete list element

service = [‘http’,‘ftp’,‘ssh’]
service.remove(‘ftp’)
print(service)

Remove an element from memory

del service[1]
print(service)