As the old saying goes, a year’s plan begins in spring, and a day’s plan begins in the morning. Today, the editor will start the journey of learning Python, below This is some introductory knowledge about Python that I compiled. I hope some friends will join me to learn more!
#Before learning, we must first understand Python so that we can better use it in the future.
Python was invented by Guido van Rossum at the end of 1989, and the first public release was released in 1991.
Like the Perl language, Python source code also follows the GPL (GNU General Public License) agreement. Python is a high-level scripting language that combines interpreted, compiled, interactive and object-oriented scripting. Its design is highly readable. Compared with other languages, it often uses English keywords and some punctuation marks in other languages. It has a more distinctive grammatical structure than other languages.
For most programming languages, the first introductory programming code is "Hello World!". The following code uses Python to output "Hello World!":
#!/usr/bin/python print "Hello, World!";
Python has many advantages, as follows:
1. Easy to learn: Python has relatively few keywords, a simple structure, and a well-defined syntax, making it easier to learn.
2. Easy to read: Python code is more clearly defined.
3. Easy to maintain: The success of Python is that its source code is quite easy to maintain.
4. An extensive standard library: One of Python’s biggest advantages is its rich library, which is cross-platform and compatible with UNIX, Windows and Macintosh.
5. Interactive mode: Interactive mode support, you can enter the language to execute the code from the terminal and get the results, interactive testing and debugging code snippets.
6. Portable: Based on its open source nature, Python has been ported (that is, made to work) to many platforms.
7. Extensible: If you need a critical piece of code that runs very fast, or want to write some algorithms that you don’t want to open up, you can use C or C to complete that part of the program, and then start it from your Python called in the program.
8. Database: Python provides interfaces to all major commercial databases.
9.GUI programming: Python supports GUIs that can be created and ported to many system calls.
10. Embeddable: You can embed Python into C/C programs, allowing users of your program to gain "Scripting" capabilities.
Now that we know so much, let’s set up a Python environment together!
Python’s latest source code, binary documents, news information, etc. can be viewed on Python’s official website:
Python official website: http://www.python.org/
you You can download the Python documentation at the link below. You can download the documentation in HTML, PDF, PostScript and other formats.
Python document download address: www.python.org/doc/
The following are methods for installing Python on different platforms:
Installing Python on Unix & Linux platforms:
The following are simple steps to install Python on Unix & Linux platforms:
Open a WEB browser and visit http://www.python.org /download/
Select the source code compression package suitable for Unix/Linux.
Download and decompress the compressed package.
If you need to customize some options, modify Modules/Setup
Execute ./configure script
make
make install
Execute After the above operations, Python will be installed in the /usr/local/bin directory, and the Python library will be installed in /usr/local/lib/pythonXX, where XX is the version number of Python you are using.
Installing Python on Window platform:
The following are simple steps to install Python on Window platform:
Open WEB browser Visit http://www.python.org/download/
and select the Window platform installation package in the download list. The package format is: python-XYZ.msi file, XYZ is the version number you want to install.
To use the installer python-XYZ.msi, the Windows system must support Microsoft Installer 2.0. Just save the installation file to your local computer and run it to see if your machine supports MSI. Windows XP and later versions already have MSI, and many older machines can also install MSI.
After downloading, double-click the download package to enter the Python installation wizard. The installation is very simple. You only need to use the default settings and click "Next" until the installation is completed.
Installing Python on MAC platform:
Recent Macs systems all come with a Python environment. You can also install it at the link http://www Download and install the latest version from .python.org/download/.
Set environment variables in Unix/Linux
In csh shell: Enter setenv PATH "$PATH:/usr/local/bin/python" and press "Enter".
In bash shell (Linux): Enter export PATH="$PATH:/usr/local/bin/python" and press "Enter".
In sh or ksh shell: enter PATH="$PATH:/usr/local/bin/python" and press "Enter".
Note: /usr/local/bin/python is the installation directory of Python.
Set environment variables in Windows
Add the Python directory in the environment variable: In the command prompt box (cmd): enter path=%path%;C:\ Python presses "Enter".
Note: C:\Python is the installation directory of Python.
It can also be set in the following ways: right-click "Computer", then click "Properties" and then click "Advanced System Settings", select "Path" under the "System Variables" window, and double-click!
Then in the "Path" line, just add the python installation path (my D:\Python32), so later, just add the path.
ps: Remember, the path is directly separated by a semicolon ";"!
After the final setting is successful, enter the command "python" on the cmd command line to display the relevant information.
In this way, its environment is configured successfully!
The editor is using the win7 system. I followed the previous practices and tested whether the environment was configured successfully, as shown below:
cmd Open the command line and enter the python command , press enter to check whether it is successful. If the text as shown in the picture appears, it means that the environment configuration is correct.
Enter a statement print ('Hello World'), press enter, and check whether it is successful (note whether the statement is correct, the editor used angle brackets at the beginning, use round brackets) ).
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