diff --git a/dist/tests/if_lib/bpt_if.py b/dist/tests/if_lib/bpt_if.py
index f76319b190..190b999983 100644
--- a/dist/tests/if_lib/bpt_if.py
+++ b/dist/tests/if_lib/bpt_if.py
@@ -16,9 +16,6 @@ class BptIf(LLShell):
     """Getters and setters for the memory map."""
     DEVICE_NUM = 0x42A5
 
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
     def is_connected_to_board(self):
         """Checks if board is connected."""
         return self.get_sys_device_num()["data"] == self.DEVICE_NUM
diff --git a/dist/tests/if_lib/driver_manager.py b/dist/tests/if_lib/driver_manager.py
index f51b7b5916..f3f1f2872c 100644
--- a/dist/tests/if_lib/driver_manager.py
+++ b/dist/tests/if_lib/driver_manager.py
@@ -13,20 +13,20 @@ from .riot_driver import RiotDriver
 
 def driver_from_config(dev_type='serial', *args, **kwargs):
     """Returns driver instance given configuration"""
-    if dev_type is 'serial':
+    if dev_type == 'serial':
         return SerialDriver(*args, **kwargs)
-    elif dev_type is 'riot':
+    elif dev_type == 'riot':
         return RiotDriver(*args, **kwargs)
-    elif dev_type is 'driver':
+    elif dev_type == 'driver':
         return kwargs['driver']
     raise NotImplementedError()
 
 
 def available_configs(dev_type='serial', *args, **kwargs):
     """Returns possible configurations to attempt to connect to."""
-    if dev_type is 'serial':
+    if dev_type == 'serial':
         return SerialDriver.get_configs(*args, **kwargs)
-    elif dev_type is 'riot':
+    elif dev_type == 'riot':
         return RiotDriver.get_configs(*args, **kwargs)
     raise NotImplementedError()
 
diff --git a/dist/tests/if_lib/dut_shell.py b/dist/tests/if_lib/dut_shell.py
index 1b6f83fcca..0375d5a184 100644
--- a/dist/tests/if_lib/dut_shell.py
+++ b/dist/tests/if_lib/dut_shell.py
@@ -20,9 +20,6 @@ class DutShell(BaseDevice):
     RESULT_ERROR = 'Error'
     RESULT_TIMEOUT = 'Timeout'
 
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
     @staticmethod
     def _try_parse_data(data):
         if ('[' in data) and (']' in data):
diff --git a/dist/tests/if_lib/ll_shell.py b/dist/tests/if_lib/ll_shell.py
index 2cae64a41c..00e5ccd41e 100644
--- a/dist/tests/if_lib/ll_shell.py
+++ b/dist/tests/if_lib/ll_shell.py
@@ -24,9 +24,6 @@ class LLShell(BaseDevice):
     RESULT_ERROR = 'Error'
     RESULT_TIMEOUT = 'Timeout'
 
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
     @staticmethod
     def _try_parse_data(data):
         parsed_data = None