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I. vector, matrix and array Author: Chris Albon Translator: Flying dragon Agreement: CC BY-NC-SA 4.0 Transpose matrix or vector # Loading Library import numpy as np # Create vector vector = np.array([1, 2, 3, 4, 5, 6]) # Create matrix matrix = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) # ...

Blog Homepage 1. Declare higher-order functions A higher-order function is one that takes another function as a parameter or return value. In kotlin, functions can be represented by lambda or function references.For example, the filter function in the standard library takes a judging function as a parameter, so it is a higher-order function lis ...

Introduction IEnumerable is the base interface of all non generic collections that can be enumerated. IEnumerable contains a method GetEnumerator(), which returns an IEnumerator. IEnumerator provides the function of circular access to the collection through the Current property and MoveNext() and Reset() methods. IEnumerable interface Exposes e ...

Several notification types in SpringAOP and how to create simple notifications have been described previously See address 1. What is the starting point In the previous example, we could create a ProxyFactory to create notifications and get the methods in the target class.Different types of notifications allow you to do different things with the ...

I have a list of dictionaries that I want each item to be sorted by a specific attribute value. Consider the following array, [{'name':'Homer', 'age':39}, {'name':'Bart', 'age':10}] When sorting by name, it should be [{'name':'Bart', 'age':10}, {'name':'Homer', 'age':39}] #1st floor Using Perl's Schwartzian transformation, py ...

python common functions (v3.0) lambda anonymous function # lambda <params>:<result> func = lambda x, y: x + y print(func(1, 2)) # Output 3 map function Pass one or more elements in sequnce as parameters to func for execution, and return the result of function execution as an iterator. # map(func, sequnce[, sequnce,.... ...

1. Review topics of object-oriented, file operation and database operation: The file score.dat holds the names of 100 students and their Python lessons, advanced mathematics and English scores. (1) define the student class, including name, Python class, advanced mathematics and English scores, total score and average score data members, and ...

Built in function mind map: https://www.processon.com/mindmap/5c10ca52e4b0c2ee256ac034 Built-in function Anonymous function The unified name of anonymous function is: < lambda > Usage scenario: used with sorted, map and filter   fn = lambda a, b : a + b # Define a very simple function. Do not use complex functions lambda ret = fn(3, 5) p ...

jdk8 foreach creation object optimization lambda foreach creating objects @Async public void asyncFullEsDoc() { List<Integer> docIdList = Arrays.asList(913,914); if (CollectionUtil.isNotNullOrEmpty(docIdList)){ List<Document> documents = new ArrayList<>(500); docIdList.forEa ...

Just contacted netcore, the following configuration instructions I am using and some points to be injected 1. I don't want to use constructor injection in my project, so I refer to the third-party Autofac package to manage my service. In the controller, I just need to create public iClass class{get;set;} 2. I use dll reflection to inject serv ...