Python当中list列表的使用（创建列表，删除列表元素，添加列表元素，插入列表元素）

Posted 2020-11-26 Geek Song

程序如下：

#这里我们将进行列表的学习，这个列表不能和R当中的列表弄混了
classmate=[‘bob‘,‘Python‘,‘Java‘]
b=["wife","mother"]
print(len(classmate))
#下面开始进行元素的访问，python当中的首元素是0，而不是R当中的1.
print(classmate[0])
print(classmate[0:])
print(classmate[1:2])
print("print the last element:")
print(classmate[-1])
print("
print the second last element:")
print(classmate[-2])
print("
print the third last element:")
print(classmate[-3])
print("
let us append some elements to the end of the list:")
classmate.append(‘adding element‘)
print(classmate[-1])
print("
let us print all the list!:")
print(classmate)
print("
let us delete the last element:")
classmate.pop()
print(classmate)
print("
let us delete the second element:")
#delete the element we want
classmate.pop(1)
print(classmate)
print("
let us insert somthing to the second position:")
#the insert position is our reference‘s position
classmate.insert(1,"something")
print(classmate)
print("
insert a list to our list:")
classmate.insert(1,["insertelement1","insertelement2"])
print(classmate)
print("
let us get the second list‘s seconde element:")
print(classmate[1][1])

linux下运行结果如下：

geeksongs@DESKTOP-V7FKNMA:~/code$ python3 list.py
3
bob
[‘bob‘, ‘Python‘, ‘Java‘]
[‘Python‘]
print the last element:
Java

print the second last element:
Python

print the third last element:
bob

let us append some elements to the end of the list:
adding element

let us print all the list!:
[‘bob‘, ‘Python‘, ‘Java‘, ‘adding element‘]

let us delete the last element:
[‘bob‘, ‘Python‘, ‘Java‘]

let us delete the second element:
[‘bob‘, ‘Java‘]

let us insert somthing to the second position:
[‘bob‘, ‘something‘, ‘Java‘]

insert a list to our list:
[‘bob‘, [‘insertelement1‘, ‘insertelement2‘], ‘something‘, ‘Java‘]

let us get the second list‘s seconde element:
insertelement2

得解也。