Python元组与列表的区别

红太狼 2022-05-18 07:37 293阅读 0赞

Python元组与列表的区别

1. Literal（字面意义的）
  1. someTuple = (1,2)
  2. someList = [1,2]
2. Size（大小）
  1. a = tuple(range(1000))
  2. b = list(range(1000))
  4. a.__sizeof__() # 8024
  5. b.__sizeof__() # 9088

Due to the smaller size of a tuple operation, it becomes a bit faster, but not that much to mention about until you have a huge number of elements.

3. Permitted operations（允许操作）
  1. b = [1,2] 
  2. b[0] = 3 # [3, 2]
  4. a = (1,2)
  5. a[0] = 3 # Error

That also means that you can’t delete an element or sort a tuple. However, you could add new element to both list and tuple with the only difference that you will change id of the tuple by adding element

  1. a     = (1,2)
  2. b     = [1,2]  
  4. id(a)          # 140230916716520
  5. id(b)          # 748527696
  7. a   += (3,)    # (1, 2, 3)
  8. b   += [3]     # [1, 2, 3]
  10. id(a)          # 140230916878160
  11. id(b)          # 748527696
4. Usage（用法）

As a list is mutable, it can’t be used as a key in a dictionary, whereas a tuple can be used.

  1. a = (1,2)
  2. b = [1,2] 
  4. c = {a: 1} # OK
  5. c = {b: 1} # Error

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