numpy.core.defchararray.chararray.startswith
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chararray.startswith(prefix, start=0, end=None)[source]
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Returns a boolean array which is Truewhere the string element inselfstarts withprefix, otherwiseFalse.See also char.startswith
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    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.core.defchararray.chararray.startswith.html