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This article mainly introduces the relevant knowledge of "what features have been updated by Python3.10". The editor shows you the operation process through an actual case, the operation method is simple and fast, and it is practical. I hope this article "what features have been updated by Python3.10" can help you solve the problem.

Introduction of new features

1)。 Type checking improvement

In the Python3.10 version, the union operator uses the "|" line instead of the Union [] method in the old version, making the program more concise. Not only that, Python3.10 can also use the union operator of the "|" line in some built-in functions to improve the performance of the program.

2)。 Change of type alias

In the old version, the new name of the type could be given directly through different types of assignment operations, while in the Python3.10 version, the replacement of the type name was specified through TypeAlias. The advantage of this operation is that it can let program developers and Python editors know more clearly whether newname is a variable name or a type alias, and improve the reliability of program development.

3)。 Quantitative statistics with a frequency of 1 in binary representation

In the Python3.10 version, you can count the number of "1s" in the binary by calling the bit_count function, and of course, in the old version, you can do this with very simple code.

4)。 Prepare to deprecate Distutils built-in libraries

Since the functionality of the Distutils library has been replaced by the setuptools and package libraries, Distutils will be completely removed in the near future for the sake of simplicity.

5)。 Mapping attribute added to dictionary

In Python3.10, items,keys and values have added a new "mapping" attribute for the three dictionary methods. Through the above program, it can be found that the original dictionary data will be returned after calling the mapping attribute on the three methods.

6)。 The function zip () adds the strict parameter

The strict parameter is added to the zip function in Python3.10. As the name implies, the strict parameter is to strictly follow the matching principle of parameter length. In the above procedures, the lengths of keys and values lists are not the same. The old version of the zip function created a dictionary based on the parameter with the shortest length. In the new version of the zip function, when the strict parameter is set to True, the input parameter of zip must be the same length, otherwise an error will be reported.

7)。 Template matching

Python 3.10 introduces structured pattern matching, which is done through match...case keywords, and can match dictionaries, classes, and other more complex structures. The pattern matching of match...case has a lot of similarities with switch in C++ in the way it is used. In the function in the figure above, the case function matches the tuple by matching the tuple. If the third parameter of the tuple is "male", it matches to the first example. If the third parameter of the tuple is "female", it matches to the second example. If none of the previous cases is satisfied, the final default result is output.

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