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This article mainly introduces the relevant knowledge of "how to use the partial function of python". The editor shows you the operation process through an actual case. The method of operation is simple and fast, and it is practical. I hope this article "how to use the partial function of python" can help you solve the problem.

Description

1. When the function has too many parameters and needs to be simplified, you can use functools.partial to create a new function.

2. This new function can fix some of the parameters of the original function, making it easier to call.

The function is to fix some parameters of a function (that is, to set default values) and return a new function, which will be easier to call.

Instance > import functools > int2 = functools.partial (int, base=2) > int2 ("1000000") 64 > int2 ("1010101") 85

Expansion of basic knowledge points:

1. Why use partial functions?

If we define a function, such as adding four numbers to add (one, two,three,four), there are many functions in the upper layer that need to call this function. In these calls, 80% of the calls pass arguments to one=1,two=20, and if we enter the same parameters every time, which is tedious and wasteful, of course, we can solve this problem with default parameters, but what if we also need parameters to be one=2,two=10? Therefore, we need a function that can convert a function with any number of parameters into a function object with remaining parameters.

two。 What is a partial function

From the above, we have a general idea of what a partial function is: simply put, a partial function is an implementation of a function with fixed parameters, so we need:

1) name the partial function

2) pass fixed parameters

From operator import add,mulfrom functools import partialadd1=partial (add,1) add (2pr 4) # 6add (1p 2) # 3 on "how to use the partial function of python", thank you for your reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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