[ZEPPELIN-1412] add support multiline for pythonErrorIn method on python interpreter

[cloverhearts]

What is this PR for?

currently, has not support multiline exception text on python interpreter.
for example:

Exception: blabla

is error.

but

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
Exception: test exception

is sucess (now)

to resolve this issue.

What type of PR is it?

Bug Fix

Todos

• modification pythonErrorIn method
• add test case

What is the Jira issue?

https://issues.apache.org/jira/browse/ZEPPELIN-1412?jql=project%20%3D%20ZEPPELIN%20AND%20status%20%3D%20Open

How should this be tested?

added test case.

Questions:

• Does the licenses files need update? no
• Is there breaking changes for older versions? no
• Does this needs documentation? no

[bzz]

Thank you for improvements, @cloverhearts Does it work with both, python2 and python3 ?

Looks good to me.

Although as discussed under ZEPPELIN-1360 - this approach have performance implications and this code most probably is going to be removed under ZEPPELIN-1325.

Merging to master if there is no further discussions

[cloverhearts]

@bzz
thank you.
This code works with both Python 3 and 2.
In this code, the part that related to the Python version does not exist except raise Exception() and print (" Exception ( "test exception"))entry in the test code.
Thank you for your answer.

[felixcheung]

should it look at only the last line?

[cloverhearts]

@felixcheung Sorry, Can you please explain in more detail?

[bzz]

Sorry guys, I missed GH notifications on this discussion and merged it :\