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This article mainly explains the "case analysis of the underlying principles of the python dictionary". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn the "case analysis of the underlying principles of the python dictionary".

1. After version 3.6, the underlying data structure of the dictionary has changed.

2. The actual data storage and index are stored separately. Indices stores data in a two-dimensional array, leaving everything else unchanged. This ensures that Dictionary is saved sequentially when adding new key values.

Example

My_dict ['address'] =' xxx'my_dict ['salary'] = 999999 # # memory diagram indices = [1, 0, None, 2, None] entries = [[- 5954193068542476671, pointer to name, pointer to kingname], [9043074951938101872, pointer to address] Pointer to xxx], [7324055671294268046, pointer to salary, pointer to 999999] 1. What are the advantages of Python? 1. Easy to use. Compared with traditional languages such as Cmax, Java and C #, Python has less strict requirements on code format.

2. Python is open source, everyone can see the source code, and it can be ported to many platforms.

3. Python is object-oriented, which can support both process-oriented programming and object-oriented programming.

4. Python is an interpretive language. Programs written by Python do not need to be compiled into binary code and can be run directly from the source code.

5. Python has powerful functions, has many modules, and can basically achieve all the common functions.

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