Install bandit. (#851)

Author: janiversen

pymodbus/device.py

@@ -599,7 +599,7 @@ def getDiagnostic(self, bit): # pylint: disable=invalid-name
             if bit and 0 <= bit < len(self.__diagnostic):
                 return self.__diagnostic[bit]
         except Exception: # pylint: disable=broad-except
-            pass
+            return None
         return None
 
     def getDiagnosticRegister(self): # pylint: disable=invalid-name

requirements-checks.txt

@@ -1,6 +1,7 @@
 # Python packages required to run `make check'.
-flake8 >= 2.6.0
-flake8-docstrings >= 0.2.8
-pyflakes >= 1.2.3
-pylint >= 2.13.3
-codespell >= 2.1.0
+flake8>=2.6.0
+flake8-docstrings>=0.2.8
+pyflakes>=1.2.3
+pylint>=2.13.3
+codespell>=2.1.0
+bandit>=1.7.4

tox.ini

@@ -35,6 +35,13 @@ ignore_errors = false
 commands =
     codespell doc examples pymodbus test
 
+[testenv:bandit]
+deps =
+    -r requirements-checks.txt
+ignore_errors = false
+commands =
+    bandit -r doc/ examples/ pymodbus/ test/
+
 [testenv:flake8]
 deps = -r requirements-checks.txt
 commands =