ENH date_range yearly frequency flag 'A' is confusing, 'Y' should be accepted (original) (raw)

to get a yearly frequency from date range the flag is actually freq="A" (for "Annual" i guess) rather than freq="Y" for yearly.

It would seem more consistent if it accepted "Y" as well/instead of "A", following the pattern:

hour -> hourly -> H
day -> daily -> D
week -> weekly -> W
year -> yearly -> Y