isupper does not work how it works in python #45

>>> 'abc'.isupper()
False
>>> 'ABC'.isupper()
True
>>> 'ABc'.isupper()
False
>>> 'AB-C'.isupper()
True
>>> 

    //////////////////////////////////////////////////////////////////////////////////////////////
    /// @brief Return true if all cased characters in the string are uppercase and there is at least one
    /// cased character, false otherwise.
    ///
    bool isupper( const std::string & str );