How to install third-party libraries in python?

The place where the Python language is famous is its third-party libraries. It is officially because of the rich third-party libraries that the rich functions of Python can be realized. This article will introduce it to you below. How to import third-party libraries using python3.7.

1. Use pip to install online

pip installation is the simplest mode to install third-party libraries in python. You need to use pip For online installation, we must ensure two basic conditions, which are:

1. The machine to be installed can be connected to the external network.

Ensure that it can be connected to the external network. The most commonly used method is to ping Baidu official website. , as shown in the figure below, it can respond normally.

2. Know the name of the python third-party library

For example, if I want to install the Django development module, the installation command is:

pip install Django

As shown in the figure below, pip will automatically download the Django installation package from the default source location, and then start the installation:

3. After the installation is completed, a promptwill be displayed succesfully installed, then we open the python command line and try to import the module. If there are no errors in the installation process and the import process is normal, as shown in the second picture below. This means that the third-party module is successfully installed.

## 2. Install by downloading the source code package

For modules installed by pip, modules that are updated in a timely manner can ensure that the version of the source code package is consistent with the version in the pip library. However, if the update is not timely, the source code package version provided is generally newer. The source code package also has two formats:

1), tar.gz compressed package

2), github source code address

Still taking the above Django module as an example, in Django The source code package address provided on the official website is the second github source code address, as shown below:

Let’s see how to install it

1. First ensure that the git command is installed on the machine, as shown below. If it is not installed, install it. The installation of the git command on CentOS is:

yum install git -y

We have already installed it here. When executing the git --help command, the git help information can be output:

2. Then execute the download module command on the official website, as shown in the figure below. After the download is completed, there will be an additional Django directory in the current directory.

3. Then we switch to this directory and check the contents of the directory. We can see that there is a setup.py file, this is another way to install python third-party libraries.

4. Then execute the installation command:

python setup.py install

The installation will automatically start The downloaded third-party library file will flash a lot of information. If no errors are reported, don't worry about it. As shown in the second picture below:

5. After the installation is completed, the message "Finish processing dependence" will be prompted directly, which means that it has been After solving the dependency problem and installing the django module, we see that the installed version is 2.2dev, which is a development version.

#6. After the installation is completed, we open the python command line interface, import the django module, and confirm that no error messages are reported. Then output the version information of django, as shown in the figure below, it is indeed version 2.2, which is consistent with what we installed. It means the installation is successful and this version is newer than the one just installed using the pip module.

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