Tutorial to learn how to install a specific version using pip

Tutorial for pip to install a specified version, specific code examples are required

Introduction:
In Python development, we often encounter third parties who need to install a specified version library situation. However, because different versions of individual libraries may have differences in functionality and compatibility, we sometimes need to ensure that a specific version is installed.

This article will introduce how to use the pip tool to install a specified version of a third-party library, and give detailed code examples.

Step one: Confirm pip version
Before we start, we need to confirm our pip version. You can enter the following command on the command line to view the current pip version:

pip --version

If the output is similar to pip x.x.x from ..., it means that pip has been successfully installed.

If pip is not installed, you can use the following command to install it:

python -m ensurepip --default-pip

Step 2: Install the specified version of the library
After confirming that pip has been installed, we can use The pip command installs the specified version of the library. The following are several commonly used methods:

1. Use the equal sign (=) to specify the version number:

pip install 包名==版本号

Example:

pip install requests==2.22.0

2. Use Use the greater than or equal sign (>=) to specify the lowest version number:

pip install 包名>=版本号

Example:

pip install django>=2.2.0

3. Use the less than or equal sign (<) to specify the highest version number:

pip install 包名<版本号

Example:

pip install pandas<1.0.0

4. Use the tilde (~) to indicate that the latest version compatible with this version is installed:

pip install 包名~=版本号

Example:

pip install numpy~=1.19.0

Step 3: Verification of successful installation
After the installation is completed, we need to verify whether the installation was successful. You can use the following command to verify:

pip show 包名

Example:

pip show pandas

If the output contains the specified version number, it means the installation was successful.

Step 4: Upgrade and uninstall the specified version of the library
If you need to upgrade the specified version of the library, you can use the following command:

pip install --upgrade 包名==版本号

Example:

pip install --upgrade requests==2.23.0

If If you need to uninstall a specified version of a library, you can use the following command:

pip uninstall 包名==版本号

Example:

pip uninstall numpy==1.18.0

Summary:
This article introduces how to use pip to install a specified version of a third-party library, and gives specific code examples. In actual development, we often need to ensure that the installed library versions are consistent to ensure program functionality and compatibility. Through the introduction in this article, we can easily use pip to install and manage specified versions of libraries. Hope this article is helpful to everyone!

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