Installing package from different sources depending on sys_platform

I am trying to achieve the following in a Pipefile. Notice the double bsddb3:

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[packages]
bsddb3 = {version = "==6.2.6", sys_platform = "!= 'win32'"}
bsddb3 = {file = "https://download.lfd.uci.edu/pythonlibs/l8ulg3xw/bsddb3-6.2.6-cp36-cp36m-win_amd64.whl", sys_platform = "== 'win32'", platform_machine = "== 'AMD64'"}

[requires]
python_version = "3.6"

The problem with this is that I get an exception saying Duplicate keys found

bsddb3 requires installation like the above for the Windows platform. But for my Linux users they should still just install the normal bsddb3. How would I achieve this, as the above clearly does not work?

[hb-sarah]

Duplicate of #2171 for anyone who is still looking

[uranusjr]

It is not likely to be supported as-is, since TOML (Pipfile’s format) does not allow duplicated key entries. It is doable with a spec change in Pipfile, but you’ll need to go through the PEEP process for that.

The most difficult part (IMO) would be to come up with a reasonable syntax to describe this in both Pipfile and Pipfile.lock. Secondly, downloading from different sources based on platform is not really supported in Python in general, so you’d need to jump through quite some hoops to implement it.

Reading again what you want to achieve, however, I think this might actually be the wrong solution to it. The better approach is to run a private package index server to serve this package, instead of using PyPI. There are a few tools (e.g. devpi, pypiserver) allowing you to do this. You can serve bsddb3 on it, and specify this in Pipfile:

[[source]]
name = 'myindex'
url = 'http://you.index.server/simple'
verify_ssl = true

[[source]]
name = 'pypi'
url = 'https://pypi.org/simple'
verify_ssl = true

[packages]
bsddb3 = { version = '==6.2.6', index = 'myindex' }
# ...

This would allow the package to be installed using your index server instead, and you can provide suitable wheels for platforms you want to support.