src/sage/misc/lazy_import.pyx: Improve deprecation message when as_ i…

…s in use

src/sage/misc/lazy_import.pyx

@@ -255,18 +255,19 @@ cdef class LazyImport():
                 raise FeatureNotPresentError(self._feature, reason=f'Importing {self._name} failed: {e}')
             raise
 
-        name = self._as_name
         if self._deprecation is not None:
             from sage.misc.superseded import deprecation_cython as deprecation
             try:
                 trac_number, message = self._deprecation
             except TypeError:
                 trac_number = self._deprecation
-                message = ('\nImporting {name} from here is deprecated. ' +
-                    'If you need to use it, please import it directly from' +
-                    ' {module_name}').format(name=name, module_name=self._module)
+                import_command = f'from {self._module} import {self._name}'
+                if self._as_name != self._name:
+                    import_command += f' as {self._as_name}'
+                message = f'\nImporting {self._as_name} from here is deprecated; please use "{import_command}" instead'
             deprecation(trac_number, message)
         # Replace the lazy import in the namespace by the actual object
+        name = self._as_name
         if self._namespace is not None:
             if self._namespace.get(name) is self:
                 self._namespace[name] = self._object