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The concept of dictionary

Like a list, a dictionary is also a variable sequence, but unlike a list, it is an unordered variable sequence. The contents saved are stored in the form of key-value pairs (key:value). Each key-value of the dictionary is separated by a colon: separated, separated by each key-value pair, and the whole dictionary is contained in {}.

Dict = {key1:value1,key2:value2} what are the five characteristics of python? what are the five characteristics of python: 1. It's easy to learn, and when you develop a program, you focus on solving problems, not understanding the language itself. two。 Object-oriented, compared with other major languages such as C++ and Java, Python implements object-oriented programming in a very powerful and simple way. 3. Portability, Python programs can run on a variety of platforms without modification. 4. Explanation, programs written in Python do not need to be compiled into binary code and can be run directly from the source code. 5. Open source, Python is one of FLOSS (Free / Open Source Software).

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