Pin and update requirements (#18)

* Pin and update all requirements

* Fix lint issues

* Pin pylint to 1.9.3 to support Python 2

* Clean up

leicacam/cam.py

@@ -36,7 +36,7 @@ def debug(msg):
         """Debug on Windows."""
         try:
             dbg = os.environ['DEBUG']
-            if dbg == 'leicacam' or dbg == '*':
+            if dbg in ('leicacam', '*'):
                 print('leicacam ' + str(msg))
         except KeyError:
             pass
@@ -508,6 +508,6 @@ def check_messages(msgs, cmd, value=None):
     for msg in msgs:
         if value and msg.get(cmd) == value:
             return msg
-        elif not value and msg.get(cmd):
+        if not value and msg.get(cmd):
             return msg
     return None

requirements_dev.txt

@@ -3,6 +3,6 @@
 -r requirements_pypi.txt
 -r requirements_test.txt
 -r docs/requirements.txt
-tox
+tox==3.5.3
 
 -e .

requirements_test.txt

@@ -1,6 +1,6 @@
-flake8==3.5.0
-mock>=2.0.0
-pydocstyle==2.1.1
-pylint==1.8.3
-pytest==3.5.0
-pytest-cov>=2.5.1
+flake8==3.6.0
+mock==2.0.0
+pydocstyle==3.0.0
+pylint==1.9.3
+pytest==4.0.1
+pytest-cov==2.6.0

test/test_cam.py

@@ -7,7 +7,7 @@
 
 from leicacam.cam import CAM, bytes_as_dict, tuples_as_bytes, tuples_as_dict
 
-# pylint: disable=redefined-outer-name
+# pylint: disable=redefined-outer-name, unnecessary-pass,
 
 
 def flush():