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This article mainly explains "what is python dictionary dict". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what is the python dictionary dict?"

First, what is a dictionary?

A dictionary is a collection of unordered key:value key-value pairs.

Key must be an immutable data type, including str, int, float, bool, tuple, etc., not list, dict, set, etc.

Dictionaries are similar to mathematical mapping structures.

Compared with lists, dictionaries have excellent performance in frequently inserting data and querying quickly.

Dictionaries take up discontiguous storage space and are much larger than lists.

Second, create a dictionary

Third, common dictionary operations

Fourth, thinking practice

There are two dictionaries. How can they be merged into one big dictionary?

(reply keyword python09 for reference answer)

10. For a dictionary with non-duplicate value values, how to query the key corresponding to a value?

(reply keyword python10 for reference answer)

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