Update truncate() documentation and testcases

[gliptak]

• closes truncate() raises IndexError on large timeseries #11382
• tests added / passed
• passes git diff upstream/master | flake8 --diff
• whatsnew entry

[jreback]

let's move the .truncate tests to test_generic instead.

[gliptak]

Done.

[gliptak]

Done

[jreback]

and use the generic features to test Series/DataFrame/Panel

[gliptak]

Done

[jreback]

you said done, but it doesn't appear to be pushed. you need to use _construct

[gliptak]

The latest (force) push uses assert_series_equal below. Were you pointing out something different you would like to see?

[jreback]

you need to structure the test so its runnable in all of the sub-classses Testers so its tested on Series/DataFrame etc.

[gliptak]

I got you. I ran into issues (memory, indeces) when trying to generalize, so decided to move it under Series (only).

[gliptak]

I'm not sure what to make of those codecov failures ...

[jreback]

just do the big selection across the 0th dimension

[gliptak]

The actual tests were OK (although I seen OutOfMemory exceptions ...), but the _construct wasn't.

For Series/DataFrame self._construct(,index=,...) vs for Panel/Panel4D self._construct(,major_axis=,minor_axis=,...) In this test I have to have the particular index.

How do you merge these?

[gliptak]

Are you OK with this being under Series?

[jreback]

you need to make this generic, so no

[gliptak]

@jreback Please offer some snippets on how you see this being make generic (I described what I ran into in the previous post). Thanks

[gliptak]

@jreback How do you see this moving forward? Thanks

[jreback]

so in test_generic.py you can construct something generic like this:

shape = [int(1e6)] + ([1] * len(self._ndim-1)]
obj = self._construct(shape)

so will give you the first dim of 1e6 and the others 1

[gliptak]

@jreback Thank you. I made the changes, the 2e6 takes a long time to run locally (in Panel) ...

[gliptak]

Timing out in travis-ci too No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

[jreback]

thanks @gliptak

the panel comparator was doing things a very slow way. all fixed up.

[gliptak]

@jreback Thank you for fixing Panel comparator.