diff --git a/python/src/deltachat/account.py b/python/src/deltachat/account.py
index 75e5f414b..6fb32b73e 100644
--- a/python/src/deltachat/account.py
+++ b/python/src/deltachat/account.py
@@ -328,10 +328,10 @@ class Account(object):
             self.configure()
         self._threads.start()
 
-    def stop_threads(self):
+    def stop_threads(self, wait=True):
         """ stop IMAP/SMTP threads. """
         lib.dc_stop_ongoing_process(self._dc_context)
-        self._threads.stop(wait=True)
+        self._threads.stop(wait=wait)
 
     def _process_event(self, ctx, evt_name, data1, data2):
         assert ctx == self._dc_context
diff --git a/python/tests/conftest.py b/python/tests/conftest.py
index d005fc408..64668d938 100644
--- a/python/tests/conftest.py
+++ b/python/tests/conftest.py
@@ -103,7 +103,7 @@ def acfactory(pytestconfig, tmpdir, request):
             ac._evlogger.set_timeout(30)
             ac.configure(**configdict)
             ac.start_threads()
-            self._finalizers.append(ac.stop_threads)
+            self._finalizers.append(lambda: ac.stop_threads(wait=False))
             return ac
 
         def clone_online_account(self, account):
@@ -114,7 +114,7 @@ def acfactory(pytestconfig, tmpdir, request):
             ac._evlogger.set_timeout(30)
             ac.configure(addr=account.get_config("addr"), mail_pw=account.get_config("mail_pw"))
             ac.start_threads()
-            self._finalizers.append(ac.stop_threads)
+            self._finalizers.append(lambda: ac.stop_threads(wait=False))
             return ac
 
     return AccountMaker()
diff --git a/src/key.rs b/src/key.rs
index 0bcb21436..0b1fc7895 100644
--- a/src/key.rs
+++ b/src/key.rs
@@ -90,7 +90,6 @@ impl Key {
     }
 
     pub fn from_slice(bytes: &[u8], key_type: KeyType) -> Option<Self> {
-        println!("hello from_slice");
         let res: Result<Key, _> = match key_type {
             KeyType::Public => SignedPublicKey::from_bytes(Cursor::new(bytes)).map(Into::into),
             KeyType::Private => SignedSecretKey::from_bytes(Cursor::new(bytes)).map(Into::into),