numpy.core.defchararray.isdigit
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numpy.core.defchararray.isdigit(a)[source]
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Returns true for each element if all characters in the string are digits and there is at least one character, false otherwise. Calls str.isdigitelement-wise.For 8-bit strings, this method is locale-dependent. Parameters: a : array_like of str or unicode Returns: out : ndarray Output array of bools See also 
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    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.core.defchararray.isdigit.html