How to specify version ranges in Conda environment.yml

I think/assume that the syntax specifying versions is the one documented at Package match specifications.

So you would write - numpy >=1.2.3,<1.3 (space after numpy, no space after the comma - not tested).

BTW, I couldn't find any documentation describing the structure of the environment file environment.yml. creating-an-environment-from-an-environment-yml-file refers to Creating an environment file manually and vice-versa.

You could write something like:

dependencies:
  - numpy>=1.2.3, <1.3