-r requirements: add option to continue even if one of the packages is missing/not found

[tuxcanfly]

Feature request for requirements file. I would like a way to continue pip installation without throwing up when a package is not found. Maybe display a list of missing packages on completion.

[bernardobarreto]

I made some test with -r requirements, I put three packages in the file (the second doesn't exist), it crashed in the second and didn't install the third as you said. But after crashed I executed pip freeze and the first package was also not there.

With this issue, it would install the first and the third and for the second just show the "alert" saying that the package wasn't found?

[bernardobarreto]

@tuxcanfly this issue is not about the -r requirements. Is about the pip install or uninstall.
If you do: pip install figleaf doesntexist splinter it will happen what you said

[dstufft]

This is incredibly unlikely to happen. That feature more or less goes against how pip operates and I am opposed to adding it to pip.