numpy.core.defchararray.chararray.isalpha
method
- 
chararray.isalpha()[source]
- 
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
    © 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.core.defchararray.chararray.isalpha.html