Easy-to-operate pip installation guide to get you up to speed quickly

Concise and easy-to-understand pip installation guide allows you to get started easily. Specific code examples are needed

In Python development, we often use a variety of Third-party libraries, these libraries can help us complete various tasks more efficiently. Pip is a common package management tool for Python, which can help us easily install, upgrade and manage these third-party libraries. This article will provide you with a concise and easy-to-understand pip installation guide to help you get started quickly.

1. Install pip

Before using pip, you first need to install pip. For users of Python 2.7.9 and above and Python 3.4 and above, pip has been installed by default and can be used directly. If your Python version is lower or pip is not installed, you can install it through the following steps.

Open a terminal or command prompt window and enter the following command:

python get-pip.py

This line of command will automatically download the pip installation script from the official and execute the installation process. After completion, you can use the following command to verify whether pip is installed successfully:

pip --version

If you see output similar to "pip 20.0.2 from /path/to/pip (python x.x)", it means that pip is installed successfully.

2. Use pip to install third-party libraries

Installing third-party libraries is very simple. You only need to execute the following command:

pip install package_name

Among them, package_name is to be installed The name of the library. For example, if you want to install the numpy library, you only need to execute the following command:

pip install numpy

pip will automatically download the latest version of the library from the Python Package Index (PyPI for short) and install it. During the installation process, pip will also install the library's dependent libraries to ensure the normal operation of the library. After the installation is successful, you can use the following command to verify whether the installation is successful:

pip show package_name

This line of command will output relevant information about the library, including version number, installation path, etc.

3. Upgrade third-party libraries

In order to keep the latest version of the library, we need to regularly upgrade the installed third-party libraries. Upgrading the library using pip is also very simple. You only need to execute the following command:

pip install --upgrade package_name

where package_name is the name of the library to be upgraded. For example, to upgrade the numpy library, you only need to execute the following command:

pip install --upgrade numpy

pip will automatically check the latest version of the library and upgrade it. After the upgrade is successful, you can use the following command to verify whether the upgrade is successful:

pip show package_name

If the version number is updated, the upgrade is successful.

4. Specify the version of the library

Sometimes, we may need to install or upgrade a specific version of a library. It is also very simple to specify the version of the library using pip. You only need to add the version number to the installation or upgrade command. For example, to install version 1.18.4 of the numpy library, you only need to execute the following command:

pip install numpy==1.18.4

pip will automatically download and install the specified version of the library. Similarly, to upgrade the numpy library to version 1.18.4, just execute the following command:

pip install --upgrade numpy==1.18.4

5. Uninstall the third-party library

If a library is no longer needed, We can uninstall it using pip. Uninstalling the library is also very simple. You only need to execute the following command:

pip uninstall package_name

where package_name is the name of the library to be uninstalled. For example, to uninstall the numpy library, you only need to execute the following command:

pip uninstall numpy

pip will automatically delete the library from the system. After the uninstallation is successful, use the following command to verify whether the uninstallation is successful:

pip show package_name

If "WARNING: Package(s) not found" is displayed, the uninstallation is successful.

Summary

This article provides a concise and easy-to-understand pip installation guide to help you quickly get started using pip. Through operations such as installation, upgrade, specified version, and uninstallation, you can easily manage third-party libraries and keep them up-to-date. I hope this article will be helpful to your learning and practice in Python development.

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