transport: add return type annotation to method __str__
The abstract class LinkBase has no return type annotation on its
__str__ method.
Related: OS#6210
Change-Id: I26d3d2714708dbe957704b60d17ba2afa325b2c4
diff --git a/pySim/transport/serial.py b/pySim/transport/serial.py
index f4b1621..e5f7bdb 100644
--- a/pySim/transport/serial.py
+++ b/pySim/transport/serial.py
@@ -237,5 +237,5 @@
# Return value
return b2h(data), b2h(sw)
- def __str__(self):
+ def __str__(self) -> str:
return "serial:%s" % (self._sl.name)