First introduction to Python

This article was originally written by Yang Xiaoyong from MaNong.com. Please read the reprint requirements at the end of the article for reprinting. Welcome to participate in our paid contribution plan!

Introduction to Python

Python was invented in 1989 and publicly released in 1991. The latest version as of 2016 is 3.6. It is an open source, object-oriented, interpreted language. It is a simple and easy-to-learn language. Everyone who has written code has one wish, and that is to write code elegantly. Then, Python can satisfy you, because its design philosophy is "elegant", "clear" and "simple" . This can be reflected in many aspects. For example, in the language that everyone has always learned, conditional judgment is "else if", but in Python it is "elif", which is also the abbreviation of "else if". How popular is Python? The following is this year’s TIBOE language rankings, newly released:

This is not to advocate how good Python is, nor is it to show off. How popular it is, every language has its own abilities, so let’s talk about what Python can do.

Python is a high-level language for writing applications. It can be used to make websites. For example, some large websites such as YouTube, Yahoo and even Google use Python. It can also be used to make network programs such as Go before Google. Agent, people who have used it will know what its use is, and it can also be used to write background services. This function is the most used by everyone, such as writing crawler scripts.

As a programming language, Python also has shortcomings. The biggest disadvantage is that it cannot be encrypted. Because as an interpreted language, it is impossible to compile the source code into an intermediate language for cross-platform use, so Python programs are used directly from the source code.

Install Python 3.5.2

If you want to learn Python, you need to install the Python operating environment on your computer, just like you need to install the Java environment to run Java programs. This is the cross-platform language design ideas. The latest Python operating environment is 3.5.2.

Running system: Win10

Installation file (download address): https://www.python.org/downloads/

After downloading the installation file, double-click to install it. You can check "Add Python to PATH" during the process or you can add the Python path to the environment variable after installation.

After installation, run CMD, type python and get the following result, then the installation is correct:

Otherwise, check whether the installation path of Python exists in the system environment variable or Is the path correct?

Installing Python's operating environment is actually installing its interpreter. The official interpreter is called CPython. This interpreter is developed in C language. Others include PyPy, Jython, IronPython, etc. PyPy itself is written in Python, Jython is written in Java, and IconPython is written in C#. It can be used on .Net and Mono platforms, and is also compatible with Silverlight. Other interpreter related information: https://wiki.python.org/moin/PythonImplementations

Running Python

So now let’s start the most meaningful thing about learning a programming language, Print a sentence "Hello world!".

First enter python in CMD, get the ">>>" prompt, type in the code: >>>print('Hello, world!') and press Enter

This is a running method. We can also create a new script file to write:

Create a new py file in the folder. py is the file suffix of the Python program. After it is built, use text Open an editorsuch as Sublime Text or Notepad++, type in the above code, and save it. Run CMD in this folder, type the command "python file.py" to run, and you can see the print results.

All achievements in learning come from perseverance. No matter how much wind and rain there is, there will be a sunny day after the rain. I believe that our sweat will definitely create a better future!

#

The above is the detailed content of First introduction to Python. For more information, please follow other related articles on the PHP Chinese website!