Combining conda environment.yml with pip requirements.txt

Pip dependencies can be included in the environment.yml file like this (docs):

# run: conda env create --file environment.ymlname: test-envdependencies:- python>=3.5- anaconda- pip- numpy=1.13.3  # pin version for conda- pip:  # works for regular pip packages  - docx  - gooey  - matplotlib==2.0.0  # pin version for pip  # and for wheels  - http://www.lfd.uci.edu/~gohlke/pythonlibs/bofhrmxk/opencv_python-3.1.0-cp35-none-win_amd64.whl

It also works for .whl files in the same directory (see Dengar's answer) as well as with common pip packages.

One can also use the requirements.txt directly in the YAML. For example,

name: test-envdependencies:  - python>=3.5  - anaconda  - pip  - pip:    - -r requirements.txt

Basically, any option you can run with pip install you can run in a YAML. See the Advanced Pip Example for a showcase of other capabilities.

Important Note

A previous version of this answer (and Conda's Advanced Pip Example) used a substandard file URI syntax:

    - -r file:requirements.txt

Pip v21.2.1 introduced stricter behavior for URI parsing and no longer supports this. See this answer for details.

Just want to add that adding a wheel in the directory also works. I was getting this error when using the entire URL:

HTTP error 404 while getting http://www.lfd.uci.edu/~gohlke/pythonlibs/f9r7rmd8/opencv_python-3.1.0-cp35-none-win_amd64.whl

Ended up downloading the wheel and saving it into the same directory as the yml file.

name: test-envdependencies:- python>=3.5- anaconda- pip- pip:  - opencv_python-3.1.0-cp35-none-win_amd64.whl