Configure pylint for Google's Python style.

Adding pylint configuration, VSCode configuration to lint on save and
make the deploy.py script compliant.

.pylintrc

+# File taken from Tensor2Tensor project
+# https://github.com/tensorflow/tensor2tensor/blob/master/pylintrc
+
+[MASTER]
+
+# Pickle collected data for later comparisons.
+persistent=no
+
+# Set the cache size for astng objects.
+cache-size=500
+
+# Ignore Py3 files
+ignore=get_references_web.py,get_references_web_single_group.py
+
+
+[REPORTS]
+
+# Set the output format.
+# output-format=sorted-text
+
+# Put messages in a separate file for each module / package specified on the
+# command line instead of printing them on stdout. Reports (if any) will be
+# written in a file name "pylint_global.[txt|html]".
+files-output=no
+
+# Tells whether to display a full report or only the messages.
+reports=no
+
+# Disable the report(s) with the given id(s).
+disable-report=R0001,R0002,R0003,R0004,R0101,R0102,R0201,R0202,R0220,R0401,R0402,R0701,R0801,R0901,R0902,R0903,R0904,R0911,R0912,R0913,R0914,R0915,R0921,R0922,R0923
+
+# Error message template (continued on second line)
+msg-template={msg_id}:{line:3} {obj}: {msg} [{symbol}]
+
+
+[MESSAGES CONTROL]
+# List of checkers and warnings to enable.
+enable=indexing-exception,old-raise-syntax
+
+# List of checkers and warnings to disable.
+disable=design,similarities,no-self-use,attribute-defined-outside-init,locally-disabled,star-args,pointless-except,bad-option-value,global-statement,fixme,suppressed-message,useless-suppression,locally-enabled,file-ignored,multiple-imports,c-extension-no-member,trailing-newlines,unsubscriptable-object,misplaced-comparison-constant,no-member,abstract-method,no-else-return,missing-docstring,wrong-import-order,protected-access,inconsistent-return-statements,invalid-unary-operand-type,import-error,no-name-in-module,arguments-differ,not-context-manager,unused-argument
+
+[BASIC]
+
+# Required attributes for module, separated by a comma
+required-attributes=
+
+# Regular expression which should only match the name
+# of functions or classes which do not require a docstring.
+no-docstring-rgx=(__.*__|main)
+
+# Min length in lines of a function that requires a docstring.
+docstring-min-length=10
+
+# Regular expression which should only match correct module names. The
+# leading underscore is sanctioned for private modules by Google's style
+# guide.
+#
+# There are exceptions to the basic rule (_?[a-z][a-z0-9_]*) to cover
+# requirements of Python's module system.
+module-rgx=^(_?[a-z][a-z0-9_]*)|__init__$
+
+# Regular expression which should only match correct module level names
+const-rgx=^(_?[A-Z][A-Z0-9_]*|__[a-z0-9_]+__|_?[a-z][a-z0-9_]*)$
+
+# Regular expression which should only match correct class attribute
+class-attribute-rgx=^(_?[A-Z][A-Z0-9_]*|__[a-z0-9_]+__|_?[a-z][a-z0-9_]*)$
+
+# Regular expression which should only match correct class names
+class-rgx=^_?[A-Z][a-zA-Z0-9]*$
+
+# Regular expression which should only match correct function names.
+# 'camel_case' and 'snake_case' group names are used for consistency of naming
+# styles across functions and methods.
+function-rgx=^(?:(?P<exempt>setUp|tearDown|setUpModule|tearDownModule)|(?P<camel_case>_?[A-Z][a-zA-Z0-9]*)|(?P<snake_case>_?[a-z][a-z0-9_]*))$
+
+
+# Regular expression which should only match correct method names.
+# 'camel_case' and 'snake_case' group names are used for consistency of naming
+# styles across functions and methods. 'exempt' indicates a name which is
+# consistent with all naming styles.
+method-rgx=(?x)
+  ^(?:(?P<exempt>_[a-z0-9_]+__|runTest|setUp|tearDown|setUpTestCase
+         |tearDownTestCase|setupSelf|tearDownClass|setUpClass
+         |(test|assert)_*[A-Z0-9][a-zA-Z0-9_]*|next)
+     |(?P<camel_case>_{0,2}[A-Z][a-zA-Z0-9_]*)
+     |(?P<snake_case>_{0,2}[a-z][a-z0-9_]*))$
+
+
+# Regular expression which should only match correct instance attribute names
+attr-rgx=^_{0,2}[a-z][a-z0-9_]*$
+
+# Regular expression which should only match correct argument names
+argument-rgx=^[a-z][a-z0-9_]*$
+
+# Regular expression which should only match correct variable names
+variable-rgx=^[a-z][a-z0-9_]*$
+
+# Regular expression which should only match correct list comprehension /
+# generator expression variable names
+inlinevar-rgx=^[a-z][a-z0-9_]*$
+
+# Good variable names which should always be accepted, separated by a comma
+good-names=main,_
+
+# Bad variable names which should always be refused, separated by a comma
+bad-names=
+
+# List of builtins function names that should not be used, separated by a comma
+bad-functions=input,apply,reduce
+
+# List of decorators that define properties, such as abc.abstractproperty.
+property-classes=abc.abstractproperty
+
+
+[TYPECHECK]
+
+# Tells whether missing members accessed in mixin class should be ignored. A
+# mixin class is detected if its name ends with "mixin" (case insensitive).
+ignore-mixin-members=yes
+
+# List of decorators that create context managers from functions, such as
+# contextlib.contextmanager.
+contextmanager-decorators=contextlib.contextmanager,contextlib2.contextmanager
+
+
+[VARIABLES]
+
+# Tells whether we should check for unused import in __init__ files.
+init-import=no
+
+# A regular expression matching names used for dummy variables (i.e. not used).
+dummy-variables-rgx=^\*{0,2}(_$|unused_|dummy_)
+
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid to define new builtins when possible.
+additional-builtins=
+
+
+[CLASSES]
+
+# List of method names used to declare (i.e. assign) instance attributes.
+defining-attr-methods=__init__,__new__,setUp
+
+# "class_" is also a valid for the first argument to a class method.
+valid-classmethod-first-arg=cls,class_
+
+
+[EXCEPTIONS]
+
+overgeneral-exceptions=StandardError,Exception,BaseException
+
+
+[IMPORTS]
+
+# Deprecated modules which should not be used, separated by a comma
+deprecated-modules=regsub,TERMIOS,Bastion,rexec,sets
+
+
+[FORMAT]
+
+# Maximum number of characters on a single line.
+max-line-length=80
+
+# Regexp for a line that is allowed to be longer than the limit.
+# This "ignore" regex is today composed of several independent parts:
+# (1) Long import lines
+# (2) URLs in comments or pydocs. Detecting URLs by regex is a hard problem and
+#     no amount of tweaking will make a perfect regex AFAICT. This one is a good
+#     compromise.
+# (3) Constant string literals at the start of files don't need to be broken
+#     across lines. Allowing long paths and urls to be on a single
+#     line. Also requires that the string not be a triplequoted string.
+ignore-long-lines=(?x)
+  (^\s*(import|from)\s
+   |^\s*(\#\ )?<?(https?|ftp):\/\/[^\s\/$.?#].[^\s]*>?$
+   |^[a-zA-Z_][a-zA-Z0-9_]*\s*=\s*("[^"]\S+"|'[^']\S+')
+   )
+
+# Maximum number of lines in a module
+max-module-lines=99999
+
+# String used as indentation unit. We differ from PEP8's normal 4 spaces.
+indent-string='  '
+
+# Do not warn about multiple statements on a single line for constructs like
+#   if test: stmt
+single-line-if-stmt=y
+
+# Make sure : in dicts and trailing commas are checked for whitespace.
+no-space-check=
+
+
+[LOGGING]
+
+# Add logging modules.
+logging-modules=logging,absl.logging
+
+
+[MISCELLANEOUS]
+
+# List of note tags to take in consideration, separated by a comma.
+notes=
+
+
+# Maximum line length for lambdas
+short-func-length=1
+
+# List of module members that should be marked as deprecated.
+# All of the string functions are listed in 4.1.4 Deprecated string functions
+# in the Python 2.4 docs.
+deprecated-members=string.atof,string.atoi,string.atol,string.capitalize,string.expandtabs,string.find,string.rfind,string.index,string.rindex,string.count,string.lower,string.split,string.rsplit,string.splitfields,string.join,string.joinfields,string.lstrip,string.rstrip,string.strip,string.swapcase,string.translate,string.upper,string.ljust,string.rjust,string.center,string.zfill,string.replace,sys.exitfunc,sys.maxint
+
+
+# List of exceptions that do not need to be mentioned in the Raises section of
+# a docstring.
+ignore-exceptions=AssertionError,NotImplementedError,StopIteration,TypeError
+
+
+# Number of spaces of indent required when the last token on the preceding line
+# is an open (, [, or {.
+indent-after-paren=4

.vscode/settings.json

@@ -14,7 +14,10 @@
   "python.formatting.yapfArgs": [
     "--style=chromium"
   ],
+  "python.linting.enabled": true,
+  "python.linting.lintOnSave": true,
+  "python.linting.pylintEnabled": true,
   "[python]": {
     "editor.tabSize": 2
   },
-}
+}
\ No newline at end of file

deploy.py

@@ -19,12 +19,13 @@ from __future__ import division
 from __future__ import print_function
 
 import argparse
-import colorama
 import copy
 import os
 import shutil
 import subprocess
 import sys
+
+import colorama
 from tockloader.exceptions import TockLoaderException
 from tockloader import tab, tbfh, tockloader
 
@@ -77,6 +78,7 @@ def info(msg):
 
 class RemoveConstAction(argparse.Action):
 
+  #pylint: disable=W0622
   def __init__(self,
                option_strings,
                dest,
@@ -100,7 +102,7 @@ class RemoveConstAction(argparse.Action):
     # https://github.com/python/cpython/blob/master/Lib/argparse.py#L138-L147
     # https://github.com/python/cpython/blob/master/Lib/argparse.py#L1028-L1052
     items = getattr(namespace, self.dest, [])
-    if type(items) is list:
+    if isinstance(items, list):
       items = items[:]
     else:
       items = copy.copy(items)
@@ -109,7 +111,7 @@ class RemoveConstAction(argparse.Action):
     setattr(namespace, self.dest, items)
 
 
-class OpenSKInstaller(object):
+class OpenSKInstaller:
 
   def __init__(self, args):
     colorama.init()
@@ -170,7 +172,7 @@ class OpenSKInstaller(object):
         ["make", "-C", SUPPORTED_BOARDS[self.args.board], "flash"])
 
   def build_and_install_example(self):
-    assert (self.args.application)
+    assert self.args.application
     self.checked_command_output([
         "cargo", "build", "--release", "--target=thumbv7em-none-eabi",
         "--features={}".format(",".join(self.args.features)), "--example",
@@ -181,7 +183,7 @@ class OpenSKInstaller(object):
                      self.args.application))
 
   def build_and_install_opensk(self):
-    assert (self.args.application)
+    assert self.args.application
     info("Building OpenSK application")
     self.checked_command_output([
         "cargo",
@@ -204,7 +206,7 @@ class OpenSKInstaller(object):
              "key and/or certificate for OpenSK"))
 
   def install_elf_file(self, elf_path):
-    assert (self.args.application)
+    assert self.args.application
     package_parameter = "-n"
     elf2tab_ver = self.checked_command_output(["elf2tab", "--version"]).split(
         ' ', maxsplit=1)[1]
@@ -306,6 +308,7 @@ class OpenSKInstaller(object):
       error(("It seems that something went wrong. "
              "App/example not found on your board."))
       return 1
+    return 0
 
 
 def main(args):
@@ -330,8 +333,8 @@ if __name__ == '__main__':
             "applications won't be erased from the board."),
   )
 
-  parser = argparse.ArgumentParser()
-  commands = parser.add_subparsers(
+  main_parser = argparse.ArgumentParser()
+  commands = main_parser.add_subparsers(
       dest="action",
       help=("Indicates which part of the firmware should be compiled and "
             "flashed to the connected board."))
@@ -390,14 +393,14 @@ if __name__ == '__main__':
             "(i.e. more debug messages will be sent over the console port "
             "such as hexdumps of packets)."),
   )
-  apps = app_commands.add_mutually_exclusive_group()
-  apps.add_argument(
+  apps_group = app_commands.add_mutually_exclusive_group()
+  apps_group.add_argument(
       "--opensk",
       dest="application",
       action="store_const",
       const="ctap2",
       help="Compiles and installs the OpenSK application.")
-  apps.add_argument(
+  apps_group.add_argument(
       "--crypto_bench",
       dest="application",
       action="store_const",
@@ -407,4 +410,4 @@ if __name__ == '__main__':
 
   app_commands.set_defaults(features=["with_ctap1"])
 
-  main(parser.parse_args())
+  main(main_parser.parse_args())