1、list创建
new_list1 = [‘TV’,’Car’,’Cloth’,’Food’]
new_list2 = list([‘TV’,’Car’,’Cloth’,’Food’])
print (new_list1)
print (new_list2)
运行结果:
[‘TV’, ‘Car’, ‘Cloth’, ‘Food’]
[‘TV’, ‘Car’, ‘Cloth’, ‘Food’]
2、list常用的方法:
1. append
new_list1 = [‘TV’,’Car’,’Cloth’,’Food’]
print (new_list1)
new_list1.append(‘Water’) #追加’water’
print (new_list1)
运行结果:
[‘TV’, ‘Car’, ‘Cloth’, ‘Food’]
[‘TV’, ‘Car’, ‘Cloth’, ‘Food’, ‘Water’]
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2.count
new_list1 = [‘TV’,’Car’,’Cloth’,’Food’,’Food’]
print (new_list1.count(‘Food’)) #统计’food’在列表中的次数 => 2次
3.extend
new_list1 = [‘TV’,’Car’,’Cloth’,’Food’,’Food’]
new_list1.extend([11,22,33,’Car’])
print (new_list1)
运行结果:
[‘TV’, ‘Car’, ‘Cloth’, ‘Food’, ‘Food’, 11, 22, 33, ‘Car’]
4.sort
new_list1 = [‘TV’,’Car’,’Cloth’,’Food’,’Food’]
print (new_list1)
new_list1.sort()#正向排序
print (new_list1)
new_list1.sort(reverse=True)#反向排序
print (new_list1)
运行结果:
[‘TV’, ‘Car’, ‘Cloth’, ‘Food’, ‘Food’]
[‘Car’, ‘Cloth’, ‘Food’, ‘Food’, ‘TV’]#正向排序结果
[‘TV’, ‘Food’, ‘Food’, ‘Cloth’, ‘Car’]#反向排序结果
5. len
new_list1 = [‘TV’,’Car’,’Food’,’Cloth’,’Food’]
print (len(new_list1)) => 5 #打印元素的个数
6.remove
new_list1 = [‘TV’,’Car’,’Food’,’Cloth’,’Food’]
new_list1.remove(‘Food’)
print (new_list1)
运行结果:
[‘TV’, ‘Car’, ‘Cloth’, ‘Food’] #remove会删除找到的第一个相同元素
7.pop
new_list1 = [‘TV’,’Car’,’Food’,’Cloth’,’Food’]
new_list1.pop()#随机删除一个元素
print (new_list1)
new_list1.pop(2)#指定删除某个元素
print (new_list1)
运行结果为:
[‘TV’, ‘Car’, ‘Food’, ‘Cloth’]
[‘TV’, ‘Car’, ‘Cloth’]#,此处删除的是第3个元素’Food’
8.index
new_list1 = [‘TV’,’Car’,’Food’,’Cloth’,’Food’]
print (new_list1.index(‘Food’))#返回指定元素的index值，相同元素返回查找到的第一个
运行结果为:2
9.insert
new_list1 = [‘TV’,’Car’,’Food’,’Cloth’,’Food’]
new_list1.insert(2,’HAHAHA’) #向指定的位置插入元素
print (new_list1)
运行结果为:
[‘TV’, ‘Car’, ‘HAHAHA’, ‘Food’, ‘Cloth’, ‘Food’]
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