the dependency.

        Returns the string representation of the dependency as it would be
        written in the debian/control file.  The string representation does not
        include the type of the dependency.

        Example for an unversioned dependency:
          python3

        Example for a versioned dependency:
          python3 >= 3.2

        .. versionadded:: 1.0.0
        z%s %s %sN)