numpy.core.defchararray.chararray.isalpha
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chararray.isalpha()[source]
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Returns true for each element if all characters in the string are alphabetic and there is at least one character, false otherwise. See also char.isalpha
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Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.core.defchararray.chararray.isalpha.html