numpy.core.defchararray.startswith
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numpy.core.defchararray.startswith(a, prefix, start=0, end=None)[source]
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Returns a boolean array which is Truewhere the string element inastarts withprefix, otherwiseFalse.Calls str.startswithelement-wise.Parameters: a : array_like of str or unicode prefix : str start, end : int, optional With optional start, test beginning at that position. With optionalend, stop comparing at that position.Returns: out : ndarray Array of booleans See also 
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    https://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.core.defchararray.startswith.html