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Introduction to Numpy NumPy is the basic package of scientific computing in Python. It is a python library, which provides a multi-dimensional array object, various derived objects (such as masked arrays and matrices), and various routines for fast operation of arrays, including mathematics, logic, shape operation, sorting, selection, I/O, di ...

1, read_sql and to_sql function 1.1 read_sql function Reading data is generally read from the database, so in read_ Fill in the corresponding SQL statement in the SQL () function to read the data we wantpd.read_sql(sql, con, index_col=None, coerce_float=True, params=None, parse_dates=None, columns=None, chunksize=None) 1) sql: SQL command ...

Python Network Programming (Xiaobai can understand it at a glance) 1, Basic concepts of network programming 1. mac address and ip address For example, on the campus, the male god named Lucy can be separated from the campus by student number. If you want to find Lucy male god, you have to pass the ID card number. Here the student ID number is ...

Summary of basic knowledge of Python... Life is short. I use python preface Python is an easy to learn and powerful programming language. It provides efficient high-level data structure and simple and effective object-oriented programming. Python's elegant syntax and dynamic typing, as well as the essence of interpretive language, make it ...

preface Reference: rookie tutorial Rookie tutorial 1. Introduction to multithreading (1) Using threads, you can put the tasks in the program that occupy a long time to the background for processing; (2) In the implementation of some waiting tasks, such as user input, file reading and writing, network sending and receiving data, threads a ...

1, Introduction to Django framework Refer to official documents: Django official documents https://docs.djangoproject.com/zh-hans/3.2/ 2, Create the first Django project Create a new project - > select Django Django will be installed automatically If the network speed is too slow, you need to modify the pip source Modify pip sour ...

catalogue 1. Learning objectives 2. Operation explanation 3. Job results 1. Operation 1 2. Assignment 2 1. Learning objectives Using Python to achieve different investment ratiosUsing Python to implement mean variance model 2. Operation explanation Through the last task, you have learned something about Markowitz's mean variance ...

1. Introduction to Python logging module 1.1 importance of logging The programs deployed in the production environment run in a black box. They can't check the problems through debugging programs. They can't accurately reproduce the problems by observing the problem phenomena. Repairing the problems is difficult and will consume a lot of ...

What are QSS and QRC qrc: the resources associated with the application are in The qrc file specifies qrc file is an XML based file format that lists files on disk and optionally assigns them a resource name that applications must use to access the resource. QSS: full name Qt Style Sheets (Qt Style Sheets), used to beautify the Qt program inte ...

Opening JDK8 is known and used as Lambda. Many people will use it, such as Stream flow, but they are simple and easy to use, such as calling the Stream API of the collection, but they will not define their own function interface or API. Today, we use several cases to improve the use of function programming in Java. Case demonstration Functio ...