pub fn isalpha<D: Dimension>(a: &StringArray<D>) -> FerrayResult<Array<bool, D>>Expand description
Return true where every character is alphabetic (Unicode general
category L*) and the string is non-empty. Matches
numpy.strings.isalpha, which delegates per element to CPython’s
str.isalpha(). NARROWER than Rust’s char::is_alphabetic: roman
numerals like Ⅻ (category Nl) and combining marks return false.
See [is_alpha_char]/[ALPHA_RANGES].