ERR: disallow RangeIndex()

[jreback]

xref #13749

this is not consistent with other Indexes where we don't allow them to be constructed with no data passed (it can be None), but that's the idea. start must be not-None.

IOW this should raise ValueError

In [3]: pd.RangeIndex()
Out[3]: RangeIndex(start=0, stop=0, step=1)

[sinhrks]

will send a PR soon. Shouldn't the error be TypeError compat with Index?

pd.Index(None)
# TypeError: Index(...) must be called with a collection of some kind, None was pa
ssed

[jreback]

yep - was looking at something else