pub fn isupper<D: Dimension>(a: &StringArray<D>) -> FerrayResult<Array<bool, D>>Expand description
Return true where the string is uppercased and the string is
non-empty. Matches numpy.strings.isupper / CPython str.isupper()
(do_isupper): there is at least one cased character and no cased
character is lowercase or titlecase. Uncased characters (digits,
punctuation, roman numerals like Ⅻ which has the Uppercase
property) do not disqualify the string.