TST: 2.7-compat build

[jreback]

https://travis-ci.org/pydata/pandas/jobs/161159735

xref #14208

cc @llllllllll

np.full_like must be newer, can you skip on older builds (this build is with 1.7.1)

[llllllllll]

I can change this to np.full and pass the index's shape explicitly.

[jreback]

thanks

funny thing i thought the idiom was

.empty
.fill

but .full makes sense

[llllllllll]

I will use empty and fill, full and full_like were added in 1.8.0

[chris-b1]

Closed by dfb6373