bpo-31522: mailbox.get_string: pass `from_` parameter to `get_bytes` (#9857)

This allows *from_* to be successfully set to a non-default value when calling mbox.get_string.

3 files changed, 30 insertions, 1 deletions

diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index 056251d..5b4e864 100644
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -784,7 +784,7 @@ class _mboxMMDF(_singlefileMailbox):
     def get_string(self, key, from_=False):
         """Return a string representation or raise a KeyError."""
         return email.message_from_bytes(
-            self.get_bytes(key)).as_string(unixfrom=from_)
+            self.get_bytes(key, from_)).as_string(unixfrom=from_)
 
     def get_bytes(self, key, from_=False):
         """Return a string representation or raise a KeyError."""
diff --git a/Lib/test/test_mailbox.py b/Lib/test/test_mailbox.py