data files are not provided

[AlexanderPico]

Input files for the Advanced Cancer Networks and Data notebooks (Step 3):

• In the R version we load files from the extdata dir that comes packaged with RCy3. This also works when the notebook is run on JupyterHub (no sandbox required).
• In the Python version we load files from some “data” dir (chunk #33). This Is A Problem! We expect users to download files (from where?) and manually place them in a data dir relative to where they are running this ipynb. We should change this to either:
  1. Provide the file in the py4cy package (like in RCy3), or
  2. Have the notebook download the files and read them from a relative notebook dir (e.g., ‘./brc.exp.tsv’)

[yihangx]

Now users can download data from the GitHub.