How to create a requirements.txt?

Question

I'm wondering how I can create a suitable requirements.txt for my Python 3 application?

Solution 1

type following line in your command prompt

pip freeze > requirements.txt

Solution 2

There's a module called pipreqs which is designed for creating the requirements file.

pip install pipreqs
pipreqs /GitHub/FolderName #Insert path to file

Add the location to the folder where the python files reside. Pipreqs will create a requirements.txt file in the folder.

Solution 3

if you aren't in virtualenv and don't feel like putting all your installed packages in the requirements file like the accepted answer. just use pigar

Comments

[Eloims]

This answer will work assuming you are using virtualenv.

[Paco]

It will work even if not using a virtualenv, but it will list all packages installed on the system with pip

[Yauheni Leaniuk]

Thanks! This also works great (it doesn't add all the libraries in a machine, but only those used in the folder), even if you don't have a virtual environment!

[Kifsif]

Even if it works, it is too clumsy and blotted. Suppose you have 100 libraries you need in a project. And with 3 dependencies each. Will you be able to manage your requirements.txt?

[Phlucious]

This doesn't catch all possible cascading dependencies for my Cython lib, but it's the starting point I needed. Thanks.

[jspinella]

To be clear you simply install pigar and run pigar in the local directory of the python file you want the requirements.txt for