Lists are ordered collections
index从0开始
-1表示最后一个元素，-2表示倒数第二个，以此类推

  1. bicycles = ['trek', 'cannondale', 'redline', 'specialized']
  2. message = f"My first bicycle was a {bicycles[0].title()}."
  3. print(message)

Changing, Adding, and Removing Elements

  1. motorcycles = ['honda', 'yamaha', 'suzuki']
  2. print(motorcycles)
  4. # 修改
  5. motorcycles[0] = 'ducati'
  6. print(motorcycles)
  8. # 加到末尾
  9. motorcycles.append('ducati')
  10. print(motorcycles)
  12. # 插入
  13. motorcycles.insert(2, 'hhhh')
  14. print(motorcycles)
  16. # 从指定index移除
  17. del motorcycles[2]
  18. print(motorcycles)
  20. # 从末尾移除，并得到移除的值
  21. popped_motorcycle = motorcycles.pop()
  22. print(motorcycles)
  23. print(popped_motorcycle)
  25. # 从指定位置pop
  26. popped_motorcycle = motorcycles.pop(1)
  27. print(motorcycles)
  28. print(popped_motorcycle)
  30. # 删除指定值,remove只会删除第一个搜索到的值
  31. motorcycles = ['honda', 'yamaha', 'suzuki','honda']
  32. motorcycles.remove('honda')
  33. print(motorcycles)

Organizing a list

  1. # sort按字母排序，改变自身
  2. cars = ['bmw', 'audi', 'toyota', 'subaru']
  3. cars.sort()
  4. print(cars)
  6. cars = ['bmw', 'audi', 'toyota', 'subaru']
  7. cars.sort(reverse=True)
  8. print(cars)
  10. # sorted不改变自身
  11. cars = ['bmw', 'audi', 'toyota', 'subaru']
  12. print(sorted(cars))
  13. print(sorted(cars, reverse=True))
  14. print(cars)
  16. # 反转
  17. cars.reverse()
  18. print(cars)
  20. # length
  21. print(len(cars))

不允许的操作

python不允许给现有索引以外的范围赋值，而JS可以

  1. cars = ['suzuki', 'BYD']
  2. cars[100] = 'qin'  # Error list assignment index out of range