一、修改
代碼示例 motorcycles = ['honda', 'yamaha', 'suzuki'] print(motorcycles) motorcycles[0] = 'ducati' print(motorcycles)
運行結果 ['honda', 'yamaha', 'suzuki'] ['ducati', 'yamaha', 'suzuki']
二、添加
(一)使用append()添加在末尾
代碼示例 motorcycles = ['honda', 'yamaha', 'suzuki'] print(motorcycles) motorcycles.append('ducati') print(motorcycles)
方法append()將元素'ducati'添加到了列表末尾,而不影響列表中的其他所有元素: ['honda', 'yamaha', 'suzuki'] ['honda', 'yamaha', 'suzuki', 'ducati']
(二)使用insert()在列表任意位置插入元素(需要指定新元素的索引和值)
代碼示例 motorcycles = ['honda', 'yamaha', 'suzuki'] motorcycles.insert(0, 'ducati') print(motorcycles)
運行結果 ['ducati', 'honda', 'yamaha', 'suzuki']
三、刪除
(一)使用del語句刪除元素(知道要刪除的元素在列表中的位置)
代碼示例 motorcycles = ['honda', 'yamaha', 'suzuki'] print(motorcycles) del motorcycles[0] print(motorcycles)
運行結果 ['honda', 'yamaha', 'suzuki'] ['yamaha', 'suzuki']
(二)使用方法pop()刪除元素(要將元素從列表中刪除,並接着使用它的值,可以使用pop()來刪除列表中任何位置的元素,只需在括號中指定要刪除的元素的索引即可。)
代碼示例① motorcycles = ['honda', 'yamaha', 'suzuki'] print(motorcycles) popped_motorcycle = motorcycles.pop() print(motorcycles) print(popped_motorcycle)
運行結果①(.pop()刪除了列表中的末尾元素) ['honda', 'yamaha', 'suzuki'] ['honda', 'yamaha'] suzuki
代碼示例② motorcycles = ['honda', 'yamaha', 'suzuki'] first_owned = motorcycles.pop(0) print('The first motorcycle I owned was a ' + first_owned.title() + '.')
運行結果②
The first motorcycle I owned was a Honda.
(三)根據值刪除元素(只知道要刪除的元素的值,不知道要從列表中刪除的值所處的位置。可使用方法remove(),可接着使用它的值)
代碼示例① motorcycles = ['honda', 'yamaha', 'suzuki', 'ducati'] print(motorcycles) motorcycles.remove('ducati') print(motorcycles)
運行結果① ['honda', 'yamaha', 'suzuki', 'ducati'] ['honda', 'yamaha', 'suzuki']
代碼示例② motorcycles = ['honda', 'yamaha', 'suzuki', 'ducati'] print(motorcycles) too_expensive = 'ducati' motorcycles.remove(too_expensive) print(motorcycles) print("\nA " + too_expensive.title() + " is too expensive for me.")
運行結果② ['honda', 'yamaha', 'suzuki', 'ducati'] ['honda', 'yamaha', 'suzuki'] A Ducati is too expensive for me.