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如何向一个列表中添加元素,以下从三个方法来展示往一个列表中添加元素。
**
<>方法一:append()方法
**
注:列表末尾添加元素
First_list=['张三','李四','乒乓球',1] First_list.append('我是无敌的') print(First_list)
一般运用在for循环,遍历一个数组,将有需要的添加到一个列表中 例如:****判断并打印列表中大于5的元素
import numpy as np #导入numpy重命名为np Second_list=[] #创建A一个新的列表 A=np.arange(10)
#生成一个列表 [0 1 2 3 4 5 6 7 8 9] print(A) np.random.shuffle(A)
#使用shuffle函数打乱之前生成的列表 for i in A: if A[i]>5: Second_list.append(A[i]) print(
Second_list)
注:截图中的结果6、7、8、9是乱序的是因为后面用了shuffle函数进行了打乱操作
**
<>方法二:insert()方法
**
注:指定位置添加元素,通过索引的方式
First_list=['张三','李四','乒乓球',1] #TODO append方法 # First_list.append('我是无敌的') #
print(First_list) #TODO insert方法 First_list.insert(2,'王者') print(First_list)
**
<>方法三:extend()方法
**
注:一个列表添加另一个列表的全部信息,前两个都是调剖过元素添加,而这个是直接将列表的所有元素添加到另一个列表中
import numpy as np First_list=['张三','李四','乒乓球',1] #TODO append方法 #
First_list.append('我是无敌的') # print(First_list) #TODO insert方法 #
First_list.insert(2,'王者') # print(First_list) #TODO extend()方法 Second_list=np.
arange(10) #生成一个0~9的列表 print(Second_list) First_list.extend(Second_list) print(
First_list)
注意:可以将一个列表当成一个元素进行上面的添加操作