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This article mainly introduces "how to use requirements.txt files in python" related knowledge, editor through the actual case to show you the operation process, the method of operation is simple and fast, practical, I hope that this "how to use requirements.txt files in python" article can help you solve the problem.

Actual combat scene

When deploying Python applications, third-party libraries need to be installed, and here you can use the requirements.txt file, which records all dependent packages and the exact version number.

Requirements.txt files are very common when we visit open source Python projects.

Overview of simple use process

Generate a requirements.txt file using the pip freeze command

As follows:

Pip freeze > requirements.txt

Please note that each package has a unique line, followed by the version number.

The generated files execute the directory in the console by default, or you can customize the directory. You can add the file directory when you create the file.

Pip freeze > d:/requirements.txt

Where > indicates redirection, that is, the contents of the freeze output are sent to the requirements.txt file.

When migrating the environment, pay attention to packaging the file, and then deploy it using the following command

Potential problems with pip install-r requirements.txt generating requirements.txt files

If warning appears when the generated file appears, it is recommended that you use python-m to execute the pip freeze command.

If you create a Python program, or install the module without using a virtual environment, all your local packages will be packaged and extracted when you generate the requirements.txt file, which will need to be manually filtered before deployment.

Syntax format in the requirements.txt file, you can write only the name of the third-party module, do not specify the version number, and install the latest version by default.

If you use comments, use # plus text content.

The following symbols can be used between the module name and the version number:

= =: equal to

>: greater than version

> =: greater than or equal to

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