fix(create_knowledge_graph): print on stderr

[jdreo]

Fixes issue 478 (left on biocypher)

[slobentanzer]

Hi @jdreo, thanks! I am not sure, what does this change? Also in relation to the issue @mevol opened?

I think she assumed it was left in, is there a problem with printing to console in a script to show the paths we used?

[jdreo]

There's no problem printing log/side information, unless it's on stdout. Log info should be on stderr, so that an overarching script may manipulate what's the product of the script aside from the logs.

For the case of the template, I think it should print on stdout the import call file, which is (now) returned by write_import_calls. That way, the calling script may know where are the current data outputs.

[mevol]

Yes, I assumed the print was left in by mistake. If this was for capturing output I would have expected this to come from a logger not a simple print.

[slobentanzer]

@jdreo I think that's a solution to a different problem (good nonetheless). The print statement was to show the downloaded files. But I see why it may seem like left in by mistake. I'll merge this and log the download paths.