3.2 修改添加和删除元素

Posted 2021-01-14 yuxinjack

3.2.1 修改列表元素

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]
print(motorcycles)
motorcycles[0] = ‘ducati‘
print(motorcycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]
[‘ducati‘, ‘yamaha‘, ‘suzuki‘]

3.2.2在列表中添加元素

在列表末尾添加元素

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]
print(motorcycles)
motorcycles.append(‘ducati‘)
print(motorcycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]
[‘honda‘, ‘yamaha‘, ‘suzuki‘, ‘ducati‘]

在列表中插入元素

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]
print(motorcycles)
motorcycles.insert(0,‘ducati‘)
print(motorcycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]
[‘ducati‘, ‘honda‘, ‘yamaha‘, ‘suzuki‘]

3.2.3 从列表中删除元素

1.使用del语句删除元素

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]
print(motorcycles)
del motorcycles[0]
print(motorcycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]
[‘yamaha‘, ‘suzuki‘]

 

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]
print(motorcycles)
del motorcycles[1]
print(motorcycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]
[‘honda‘, ‘suzuki‘]

使用方法pop()删除元素

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]
print(motorcycles)
popped_motorcycles = motorcycles.pop()
print(motorcycles)
print(popped_motorcycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]
[‘honda‘, ‘yamaha‘]
suzuki

弹出列表中任何位置处的元素

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]
print(motorcycles)
popped_motorcycles = motorcycles.pop(0)
print("The first motorcycle I owned was a " + popped_motorcycles.title() + ".")

[‘honda‘, ‘yamaha‘, ‘suzuki‘]
The first motorcycle I owned was a Honda.

根据值删除元素

motorcycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘,‘ducati‘]
print(motorcycles)
motorcycles.remove(‘ducati‘)
print(motorcycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘, ‘ducati‘]
[‘honda‘, ‘yamaha‘, ‘suzuki‘]