tail throws exception on empty frame

[MichaelWS]

currently, tail throws an exception on an empty frame but head does not.

import pandas as pd
df = pd.DataFrame()
df.tail()

traceback:
https://gist.github.com/MichaelWS/8256143

Should this be fixed by returning the frame if empty on calls to iloc?

We can check for empty in tail on length as well or create a new slice with start being None)

[jreback]

actually both of those are wrong

change them to something like

if n < 0
n = -n
elif n== 0:
return self
return self.iloc....(differs for head/tail)

and pls add tests for the missing cases (0 and. 1)

thxs

[MichaelWS]

easy enough, will do it now.

[MichaelWS]

Do yoy think df.tail(0) return an empty frame or self?

[jreback]

if n is 0 can just return self

[MichaelWS]

jreback,
it looks like there is intended functionality for the negative n. I updated the pr

[MichaelWS]

Thanks for the help. My prs are getting easier.

On Tue, Jan 14, 2014 at 4:34 PM, jreback notifications@github.com wrote:

Closed #5846 #5846 via #5848#5848
.

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Reply to this email directly or view it on GitHubhttps://github.com//issues/5846
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