I have an array with the leading column a series of datetime objects. It
covers several years. What is the most efficient way to pull out all the
'January' dates? 

Right now I do this:

A = array with column 0 datetime objects

January = [i for i in A if i[0].month ==1 ]

It works, but I would rather use np.where and get indices and not have to
convert my list back into an array.


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