[silverweed]

This Pull request:

adds support for the dictionary syntax in RFile:

hist = rfile['hist'] # (almost) equivalent to rfile.Get('hist')

as well as the in operator:

if 'hist' in rfile: 
  # ...

NOTE: to mirror python's default behavior with the dictionary syntax, file['obj'] will raise a KeyError if obj is not in file. This is different from file.Get('obj'), which will instead return None.

Checklist:

• tested changes locally
• updated the docs (if necessary)

[dpiparo]

Thanks for this useful pythonisations!

[vepadulano]

Thank you this is really useful!