numpy.core.defchararray.isalpha (arr) returns True for each item if all characters in the string are alphabetic and there is at least one character; otherwise returns false
arr: array_like of str or unicode.
Returns: [ndarray] Output array of bools.
Code # 1:
Input array: [`abcd`` ac1bd` `abdc`` dcba` `ab cd`] Output array: [True False True True False]
Code # 2:
Input array: [`geeks`` for` `geeks`` wow! `] Output array: [True True True False]
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