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[Python] comparison of list, tuple, array and bidirectional queue methods
2022-02-01 03:38:51 【Hazelnut】
「 This is my participation 11 The fourth of the yuegengwen challenge 1 God , Check out the activity details ：2021 One last more challenge 」
Array array
If you need a list that contains only numbers , array.array Than list More efficient , Because the array doesn't store numeric objects behind it （ Such as float ）, But the machine translation of numbers , That is, byte expression . This is similar to C Like arrays in language .
Array supports all operations related to variable sequences , Include .pop 、.insert and .extend . in addition , Arrays also provide a faster way to read from and store files , Such as .frombytes and .tofile .
array.array The first parameter indicates the data type of the array element .Python You will not be allowed to store data other than the specified type in the array .
queue deque
collections.deque class （ The bidirectional queue ） Is a thread safe 、 You can quickly add or remove element data types from both ends （ append and popleft It's all atomic operations ）.
If you want to have a data type to store “ Some of the elements that have been used recently ”,deque It's also a good choice . This is because when creating a new two-way queue , You can specify the size of the queue , If the queue is full , You can also remove expired elements from the reverse side , Then add a new element at the end .
Methods to compare
| Method | list | Tuples | Array | The bidirectional queue | explain |
|---|---|---|---|---|---|
s__add__(s2) |
Yes | Yes | Yes | s + s2 , Splicing |
|
s__iadd__(s2) |
Yes | Yes | Yes | s += s2 , Local splicing |
|
s.append(e) |
Yes | Yes | Yes | Add a new element to the tail | |
s.appendleft(e) |
Yes | Add a new element to the tail | |||
s.clear() |
Yes | Yes | Delete all elements | ||
s.__contains__(e) |
Yes | Yes | Yes | s Does it include e |
|
s.copy() |
Yes | A shallow copy | |||
s.__copy__() |
Yes | Yes | Yes copy.copy Support for |
||
s.__deepcopy__() |
Yes | Yes copy.deepcopy Support for |
|||
s.count(e) |
Yes | Yes | Yes | Yes | e stay s Number of occurrences in |
s.__delitem__(p) |
Yes | Yes | Yes | Delete at p The elements of |
|
s.extend(it) |
Yes | Yes | Yes | Put the iteratable object it Append to s The tail |
|
s.extendleft(it) |
Yes | Put the iteratable object it Append to s Head |
|||
s.__getitem__(p) |
Yes | Yes | Yes | Yes | Get at p The elements of |
s.__getnewargs__() |
Yes | stay pickle Supports more optimized serialization in |
|||
s.index(e) |
Yes | Yes | Yes | find s in e First occurrence |
|
s.insert(p, e) |
Yes | Yes | In position p Insert element before e |
||
s.__iter__() |
Yes | Yes | Yes | Yes | obtain s The iterator |
s.__len__() |
Yes | Yes | Yes | Yes | len(s) Element number |
s.__mul__(n) |
Yes | Yes | Yes | s * n , Repeat splicing |
|
s.__imul__(n) |
Yes | Yes | s *= n , Repeat splicing in place |
||
s.__rmul__(n) |
Yes | Yes | Yes | n * s , Reverse splicing |
|
s.pop([p]) |
Yes | Yes | Yes ( No arguments ) | Delete last / be located p And return its value |
|
s.popleft() |
Yes | Delete the first element and return its value | |||
s.remove(e) |
Yes | Yes | Yes | Delete s For the first time in e |
|
s.reverse() |
Yes | Yes | Yes | Local reverse order | |
s.__reversed__() |
Yes | Yes | Yes | Returns the inverted iterator | |
s.rotate(n) |
Yes | Yes | hold n Move elements from one end of the queue to the other |
||
s.__setitem__(p, e) |
Yes | Yes | Yes | Place p Replace with element e |
|
s.sort([key], [reverse]) |
Yes | Sort | |||
s.byteswap |
Yes | Flip the byte sequence of each element in the array | |||
s.frombytes(b) |
Yes | Read out the byte sequence compressed into machine value and add it to the tail | |||
s.fromfile(f,n) |
Yes | The binary file f It contains the machine value, which is read out and added to the tail , Maximum addition n term |
|||
s.fromlist(l) |
Yes | Add the elements in the list to the end , If any of these elements cause TypeError abnormal , Then all additions will be cancelled |
|||
s.tobytes() |
Yes | Use the machine values of all elements with bytes Object's form return |
|||
s.tofile(f) |
Yes | Write all elements to a file in the form of machine values | |||
s.tolist() |
Yes | Convert an array into a list , The element types in the list are numeric objects | |||
s.typecode |
Yes | Returns a one character string , The elements in the array represent C Types in language |
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