py.test reports IndexError/KeyError as an Failure instead of Error

[ycui]

• Include a detailed description of the bug or suggestion
  py.test reports IndexError/KeyError as an Failure instead of Error, same file run by nosetest and unittest runner report as Error

• pip list of the virtual environment you are using
  $ python2.7 -m pip list
  cffi (1.9.1)
  cryptography (1.7.1)
  enum34 (1.1.6)
  idna (2.1)
  ipaddress (1.0.17)
  paramiko (2.1.1)
  pip (8.1.2)
  py (1.4.29)
  pyasn1 (0.1.9)
  pycparser (2.17)
  pytest (2.7.2)
  setuptools (25.0.1)
  six (1.9.0)
  wheel (0.29.0)

• pytest and operating system versions
  This is pytest version 2.7.2

• Minimal example if possible
  http://stackoverflow.com/questions/41272327/py-test-reporting-indexerror-keyerror-as-a-failure-instead-of-error

Not sure if this is my user error, or an issue, or a design difference, pls help to clarify, thanks for your help.

[nicoddemus]

Posted an answer in the stackoverflow thread, but in short the current behavior is by design and not a bug.

Worth mentioning again pytest-finer-verdicts written by @rvprasad. 😁

Closing this for now, feel free to post other questions though.