diff --git a/ci_scripts/run_all.sh b/ci_scripts/run_all.sh
index 59384eb42..da8cf9c4c 100755
--- a/ci_scripts/run_all.sh
+++ b/ci_scripts/run_all.sh
@@ -37,7 +37,7 @@ if [ -n "$TESTS" ]; then
     export PYTHONDONTWRITEBYTECODE=1
 
     # run tox
-    tox --workdir "$TOXWORKDIR" -e py27,py35,py36,py37,auditwheels
+    tox --workdir "$TOXWORKDIR" -e lint,py27,py35,py36,py37,auditwheels
     popd
 fi
 
diff --git a/python/src/deltachat/__init__.py b/python/src/deltachat/__init__.py
index bb1d482fc..7ad9d6052 100644
--- a/python/src/deltachat/__init__.py
+++ b/python/src/deltachat/__init__.py
@@ -2,7 +2,7 @@ from deltachat import capi, const
 from deltachat.capi import ffi
 from deltachat.account import Account  # noqa
 
-__version__ = "0.10.0.dev2"
+__version__ = "0.10.0.dev3"
 
 
 _DC_CALLBACK_MAP = {}
diff --git a/python/src/deltachat/account.py b/python/src/deltachat/account.py
index ddffcdfc1..9025cee14 100644
--- a/python/src/deltachat/account.py
+++ b/python/src/deltachat/account.py
@@ -285,14 +285,14 @@ class Account(object):
         """return after all delta chat state is exported to a new file in
         the specified directory.
         """
-        l = os.listdir(backupdir)
+        snap_files = os.listdir(backupdir)
         self._imex_completed.clear()
         lib.dc_imex(self._dc_context, 11, as_dc_charpointer(backupdir), ffi.NULL)
         if not self._threads.is_started():
             lib.dc_perform_imap_jobs(self._dc_context)
         self._imex_completed.wait()
         for x in os.listdir(backupdir):
-            if x not in l:
+            if x not in snap_files:
                 return os.path.join(backupdir, x)
 
     def import_from_file(self, path):
@@ -370,14 +370,14 @@ class IOThreads:
                 thread.join()
 
     def imap_thread_run(self):
-        print ("starting imap thread")
+        print("starting imap thread")
         while not self._thread_quitflag:
             lib.dc_perform_imap_jobs(self._dc_context)
             lib.dc_perform_imap_fetch(self._dc_context)
             lib.dc_perform_imap_idle(self._dc_context)
 
     def smtp_thread_run(self):
-        print ("starting smtp thread")
+        print("starting smtp thread")
         while not self._thread_quitflag:
             lib.dc_perform_smtp_jobs(self._dc_context)
             lib.dc_perform_smtp_idle(self._dc_context)
diff --git a/python/tests/test_account.py b/python/tests/test_account.py
index e35fbe4f5..211e79401 100644
--- a/python/tests/test_account.py
+++ b/python/tests/test_account.py
@@ -234,9 +234,9 @@ class TestOfflineAccount:
         assert os.path.exists(path)
         ac2 = acfactory.get_unconfigured_account()
         ac2.import_from_file(path)
-        l = ac2.get_contacts(query="some1")
-        assert len(l) == 1
-        contact2 = l[0]
+        contacts = ac2.get_contacts(query="some1")
+        assert len(contacts) == 1
+        contact2 = contacts[0]
         assert contact2.addr == "some1@hello.com"
         chat2 = ac2.create_chat_by_contact(contact2)
         messages = chat2.get_messages()
@@ -270,9 +270,9 @@ class TestOnlineAccount:
         c2 = ac1.create_contact(email=ac2.get_config("addr"))
         chat = ac1.create_chat_by_contact(c2)
         assert chat.id >= const.DC_CHAT_ID_LAST_SPECIAL
-        #wait_successful_IMAP_SMTP_connection(ac1)
+        wait_successful_IMAP_SMTP_connection(ac1)
         wait_configuration_progress(ac1, 1000)
-        #wait_successful_IMAP_SMTP_connection(ac2)
+        wait_successful_IMAP_SMTP_connection(ac2)
         wait_configuration_progress(ac2, 1000)
 
         msg_out = chat.send_text("message1")
diff --git a/python/tox.ini b/python/tox.ini
index a07d18eb5..8405deb4e 100644
--- a/python/tox.ini
+++ b/python/tox.ini
@@ -27,7 +27,7 @@ commands =
 [testenv:lint]
 skipsdist = True
 usedevelop = True
-basepython = python2.7
+basepython = python3.5
 deps =
     flake8
     # pygments required by rst-lint