Python列表：元素的修改、添加、删除和排序

标签：删除cycleota反转结果使用bordertextpytho

本文参考自《Python编程：从入门到实践》，作者：Eric Matthes，译者：袁国忠

操作
语法
举例
结果

修改元素

motocycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]

print (motocycles)

motocycles[0] = ‘ducati‘

print (motocycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]

[‘ducati‘, ‘yamaha‘, ‘suzuki‘]

添加元素

在列表末尾添加元素：append()

motocycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]

print (motocycles)

motocycles.append(‘ducati‘)

print (motocycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]

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

在列表中插入元素：insert()

motocycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]

print (motocycles)

motocycels.insert(0, ‘ducati‘)

print (motocycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]

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

删除元素

根据索引删除：del，无法继续使用

motocycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]

print (motocycles)

del motocycles[1]

print (motocycles)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]

[‘honda‘, ‘suzuki‘]

删除末尾的元素：pop()，可以继续使用

也可以根据索引删除，如motocycles.pop(0)

motocycles = [‘honda‘, ‘yamaha‘, ‘suzuki‘]

print (motocycles)

popped_motocycle = motocycles.pop()

print (motocycles)

print (popped_motocycle)

[‘honda‘, ‘yamaha‘, ‘suzuki‘]

[‘honda‘, ‘yamaha‘]

suzuki

不知道索引时，根据值删除元素：remove()，可以继续使用

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

print (motocycles)

too_expensive = ‘ducati‘

motocycles.remove(too_expensive)

print (motocycles)

print (too_expensive)

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

[‘honda‘, ‘yamaha‘, ‘suzuki‘]

ducati

元素排序

永久性排序：sort()

反方向排序：sort(reverse = True)

cars = [‘bmw‘, ‘audi‘, ‘toyota‘, ‘subaru‘]

print (cars)

cars.sort()

print (cars)

cars = [‘bmw‘, ‘audi‘, ‘toyota‘, ‘subaru‘]

cars.sort(reverse = True)