def test_delta_to_tick():
delta = timedelta(3)
tick = delta_to_tick(delta)
assert tick == offsets.Day(3)
td = Timedelta(nanoseconds=5)
tick = delta_to_tick(td)
assert tick == Nano(5)
def raise_on_incompatible(left, right):
"""
Helper function to render a consistent error message when raising
IncompatibleFrequency.
Parameters
----------
left : PeriodArray
right : None, DateOffset, Period, ndarray, or timedelta-like
Returns
-------
IncompatibleFrequency
Exception to be raised by the caller.
"""
# GH#24283 error message format depends on whether right is scalar
if isinstance(right, (np.ndarray, ABCTimedeltaArray)) or right is None:
other_freq = None
elif isinstance(right, (ABCPeriodIndex, PeriodArray, Period, BaseOffset)):
other_freq = right.freqstr
else:
other_freq = delta_to_tick(Timedelta(right)).freqstr
msg = DIFFERENT_FREQ.format(cls=type(left).__name__,
own_freq=left.freqstr,
other_freq=other_freq)
return IncompatibleFrequency(msg)
