Linter python (#299)

* Added pyflakes and Pylint for python

* Actually run linter in CI

* some simple pyflakes changes

* Add flake8 to panda reqs for linter test

* flake8 errors are fixed

* run flake8 in regression tests

* meant to run flake8

* hack to ignore unused import

* bug

* fix bugs in tucan_loopback

* Another fix by using set_safety_mode

* added pylintrc file

* more fixes and enabled pylint as well

* Fix pylint in circleci

* added linter to readme

examples/can_bit_transition.py

@@ -1,6 +1,4 @@
 #!/usr/bin/env python3
-
-import binascii
 import csv
 import sys
 

examples/can_unique.py

@@ -13,10 +13,8 @@
 # 0,344,c000c00000000000
 
 
-import binascii
 import csv
 import sys
-from panda import Panda
 
 class Message():
   """Details about a specific message ID."""

examples/get_panda_password.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+import sys
 from panda import Panda
 
 def get_panda_password():

examples/query_vin_and_stats.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 import time
 import struct
-import binascii
 from panda import Panda
 from hexdump import hexdump
 from panda.python.isotp import isotp_send, isotp_recv