python library ...????

# python # Pythonprogramming # Pythonlearning # Web Site Writing Basics # Library_ of _ python

To visualize it as clearly as possible, let's go a little closer into the concept of the Library in terms of programming.

1. Technical meaning

In computers, a Library is a file that collects functions, classes, or variables that have been written. It focuses on solving a particular issue (Specialized tasks) so that other programmers can run it immediately without having to rewrite it entirely.

2. The Flow of Control

The most important point of the Library is, "You control the hierarchy."

Your Main Program: Serves as a supervisor, determines what 1-2-3 to do.

Library: Serves as a specialized expert henchman.

Rhythm: When step 2 requires complex mathematical calculations, you send the data to the Library. Once the Library sends back the results, you resume the task in step 3.

3. Key components of the Library

When you study a library, you often find these:

Documentation: An instruction manual that says, "To use this tool, you have to send it something and it will return something."

APIs (Application Programming Interfaces): This is a "keypad" or "connection channel" that we use to call a function in the Library.

Dependencies: Sometimes one Library can run another Library to help with another.

4.Example of the actual situation (Scenario)

Suppose you want to write a program "Retrieve gold prices from web pages."

You write the main code: the program runs every 9 a.m.

You run Library Requests: In order for it to go, "knock on the door," ask for information from the website's server (instead, you have to write a hundred lines of the Network system management code itself).

You run the Library BeautifulSoup: to make it "unpack" only gold-priced figures out of messy pages.

You write the main code: command that number to be saved on your machine.

See: You decide when to retrieve and what to do next. Libraries only help you with the difficult work (Network and Parsing).

5. Advantages of using Library

Don't Reinvent the Wheel: Don't Reinvent Repeating Basic Functions such as Date Management, Number Random, or Graph Drawing

Accuracy: Popular libraries have been tested by programmers around the world a million times, so there is less chance of bugs than we write ourselves.

Performance: Libraries are often customized (Optimize). Code comes to run as quickly as possible at the structural level.

Summary

Library is that we are the "architect" in charge of all the construction work, but we choose "prefabricated parts" (such as prefabricated door frames, prefabricated bag plaster) to install in our home to complete the work faster and standardized.