Update to new build process and add lint.

This also fixes lint errors with no external API changes.

.gitignore

@@ -4,5 +4,7 @@ dist
 *.pyc
 _build/
 *.mpy
-build/
 .DS_Store
+.env
+build*
+bundles

.pylintrc

@@ -0,0 +1,433 @@
+[MASTER]
+
+# A comma-separated list of package or module names from where C extensions may
+# be loaded. Extensions are loading into the active Python interpreter and may
+# run arbitrary code
+extension-pkg-whitelist=
+
+# Add files or directories to the blacklist. They should be base names, not
+# paths.
+ignore=CVS
+
+# Add files or directories matching the regex patterns to the blacklist. The
+# regex matches against base names, not paths.
+ignore-patterns=
+
+# Python code to execute, usually for sys.path manipulation such as
+# pygtk.require().
+#init-hook=
+
+# Use multiple processes to speed up Pylint.
+# jobs=1
+jobs=2
+
+# List of plugins (as comma separated values of python modules names) to load,
+# usually to register additional checkers.
+load-plugins=
+
+# Pickle collected data for later comparisons.
+persistent=yes
+
+# Specify a configuration file.
+#rcfile=
+
+# Allow loading of arbitrary C extensions. Extensions are imported into the
+# active Python interpreter and may run arbitrary code.
+unsafe-load-any-extension=no
+
+
+[MESSAGES CONTROL]
+
+# Only show warnings with the listed confidence levels. Leave empty to show
+# all. Valid levels: HIGH, INFERENCE, INFERENCE_FAILURE, UNDEFINED
+confidence=
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once).You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use"--disable=all --enable=classes
+# --disable=W"
+# disable=import-error,print-statement,parameter-unpacking,unpacking-in-except,old-raise-syntax,backtick,long-suffix,old-ne-operator,old-octal-literal,import-star-module-level,raw-checker-failed,bad-inline-option,locally-disabled,locally-enabled,file-ignored,suppressed-message,useless-suppression,deprecated-pragma,apply-builtin,basestring-builtin,buffer-builtin,cmp-builtin,coerce-builtin,execfile-builtin,file-builtin,long-builtin,raw_input-builtin,reduce-builtin,standarderror-builtin,unicode-builtin,xrange-builtin,coerce-method,delslice-method,getslice-method,setslice-method,no-absolute-import,old-division,dict-iter-method,dict-view-method,next-method-called,metaclass-assignment,indexing-exception,raising-string,reload-builtin,oct-method,hex-method,nonzero-method,cmp-method,input-builtin,round-builtin,intern-builtin,unichr-builtin,map-builtin-not-iterating,zip-builtin-not-iterating,range-builtin-not-iterating,filter-builtin-not-iterating,using-cmp-argument,eq-without-hash,div-method,idiv-method,rdiv-method,exception-message-attribute,invalid-str-codec,sys-max-int,bad-python3-import,deprecated-string-function,deprecated-str-translate-call
+disable=print-statement,parameter-unpacking,unpacking-in-except,old-raise-syntax,backtick,long-suffix,old-ne-operator,old-octal-literal,import-star-module-level,raw-checker-failed,bad-inline-option,locally-disabled,locally-enabled,file-ignored,suppressed-message,useless-suppression,deprecated-pragma,apply-builtin,basestring-builtin,buffer-builtin,cmp-builtin,coerce-builtin,execfile-builtin,file-builtin,long-builtin,raw_input-builtin,reduce-builtin,standarderror-builtin,unicode-builtin,xrange-builtin,coerce-method,delslice-method,getslice-method,setslice-method,no-absolute-import,old-division,dict-iter-method,dict-view-method,next-method-called,metaclass-assignment,indexing-exception,raising-string,reload-builtin,oct-method,hex-method,nonzero-method,cmp-method,input-builtin,round-builtin,intern-builtin,unichr-builtin,map-builtin-not-iterating,zip-builtin-not-iterating,range-builtin-not-iterating,filter-builtin-not-iterating,using-cmp-argument,eq-without-hash,div-method,idiv-method,rdiv-method,exception-message-attribute,invalid-str-codec,sys-max-int,bad-python3-import,deprecated-string-function,deprecated-str-translate-call,import-error
+
+# Enable the message, report, category or checker with the given id(s). You can
+# either give multiple identifier separated by comma (,) or put this option
+# multiple time (only on the command line, not in the configuration file where
+# it should appear only once). See also the "--disable" option for examples.
+enable=
+
+
+[REPORTS]
+
+# Python expression which should return a note less than 10 (10 is the highest
+# note). You have access to the variables errors warning, statement which
+# respectively contain the number of errors / warnings messages and the total
+# number of statements analyzed. This is used by the global evaluation report
+# (RP0004).
+evaluation=10.0 - ((float(5 * error + warning + refactor + convention) / statement) * 10)
+
+# Template used to display messages. This is a python new-style format string
+# used to format the message information. See doc for all details
+#msg-template=
+
+# Set the output format. Available formats are text, parseable, colorized, json
+# and msvs (visual studio).You can also give a reporter class, eg
+# mypackage.mymodule.MyReporterClass.
+output-format=text
+
+# Tells whether to display a full report or only the messages
+reports=no
+
+# Activate the evaluation score.
+score=yes
+
+
+[REFACTORING]
+
+# Maximum number of nested blocks for function / method body
+max-nested-blocks=5
+
+
+[LOGGING]
+
+# Logging modules to check that the string format arguments are in logging
+# function parameter format
+logging-modules=logging
+
+
+[SPELLING]
+
+# Spelling dictionary name. Available dictionaries: none. To make it working
+# install python-enchant package.
+spelling-dict=
+
+# List of comma separated words that should not be checked.
+spelling-ignore-words=
+
+# A path to a file that contains private dictionary; one word per line.
+spelling-private-dict-file=
+
+# Tells whether to store unknown words to indicated private dictionary in
+# --spelling-private-dict-file option instead of raising a message.
+spelling-store-unknown-words=no
+
+
+[MISCELLANEOUS]
+
+# List of note tags to take in consideration, separated by a comma.
+#notes=FIXME,XXX,TODO
+notes=FIXME,XXX
+
+
+[TYPECHECK]
+
+# List of decorators that produce context managers, such as
+# contextlib.contextmanager. Add to this list to register other decorators that
+# produce valid context managers.
+contextmanager-decorators=contextlib.contextmanager
+
+# List of members which are set dynamically and missed by pylint inference
+# system, and so shouldn't trigger E1101 when accessed. Python regular
+# expressions are accepted.
+generated-members=
+
+# 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
+
+# This flag controls whether pylint should warn about no-member and similar
+# checks whenever an opaque object is returned when inferring. The inference
+# can return multiple potential results while evaluating a Python object, but
+# some branches might not be evaluated, which results in partial inference. In
+# that case, it might be useful to still emit no-member and other checks for
+# the rest of the inferred objects.
+ignore-on-opaque-inference=yes
+
+# List of class names for which member attributes should not be checked (useful
+# for classes with dynamically set attributes). This supports the use of
+# qualified names.
+ignored-classes=optparse.Values,thread._local,_thread._local
+
+# List of module names for which member attributes should not be checked
+# (useful for modules/projects where namespaces are manipulated during runtime
+# and thus existing member attributes cannot be deduced by static analysis. It
+# supports qualified module names, as well as Unix pattern matching.
+ignored-modules=
+
+# Show a hint with possible names when a member name was not found. The aspect
+# of finding the hint is based on edit distance.
+missing-member-hint=yes
+
+# The minimum edit distance a name should have in order to be considered a
+# similar match for a missing member name.
+missing-member-hint-distance=1
+
+# The total number of similar names that should be taken in consideration when
+# showing a hint for a missing member.
+missing-member-max-choices=1
+
+
+[VARIABLES]
+
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid to define new builtins when possible.
+additional-builtins=
+
+# Tells whether unused global variables should be treated as a violation.
+allow-global-unused-variables=yes
+
+# List of strings which can identify a callback function by name. A callback
+# name must start or end with one of those strings.
+callbacks=cb_,_cb
+
+# A regular expression matching the name of dummy variables (i.e. expectedly
+# not used).
+dummy-variables-rgx=_+$|(_[a-zA-Z0-9_]*[a-zA-Z0-9]+?$)|dummy|^ignored_|^unused_
+
+# Argument names that match this expression will be ignored. Default to name
+# with leading underscore
+ignored-argument-names=_.*|^ignored_|^unused_
+
+# Tells whether we should check for unused import in __init__ files.
+init-import=no
+
+# List of qualified module names which can have objects that can redefine
+# builtins.
+redefining-builtins-modules=six.moves,future.builtins
+
+
+[FORMAT]
+
+# Expected format of line ending, e.g. empty (any line ending), LF or CRLF.
+# expected-line-ending-format=
+expected-line-ending-format=LF
+
+# Regexp for a line that is allowed to be longer than the limit.
+ignore-long-lines=^\s*(# )?<?https?://\S+>?$
+
+# Number of spaces of indent required inside a hanging  or continued line.
+indent-after-paren=4
+
+# String used as indentation unit. This is usually "    " (4 spaces) or "\t" (1
+# tab).
+indent-string='    '
+
+# Maximum number of characters on a single line.
+max-line-length=100
+
+# Maximum number of lines in a module
+max-module-lines=1000
+
+# List of optional constructs for which whitespace checking is disabled. `dict-
+# separator` is used to allow tabulation in dicts, etc.: {1  : 1,\n222: 2}.
+# `trailing-comma` allows a space between comma and closing bracket: (a, ).
+# `empty-line` allows space-only lines.
+no-space-check=trailing-comma,dict-separator
+
+# Allow the body of a class to be on the same line as the declaration if body
+# contains single statement.
+single-line-class-stmt=no
+
+# Allow the body of an if to be on the same line as the test if there is no
+# else.
+single-line-if-stmt=no
+
+
+[SIMILARITIES]
+
+# Ignore comments when computing similarities.
+ignore-comments=yes
+
+# Ignore docstrings when computing similarities.
+ignore-docstrings=yes
+
+# Ignore imports when computing similarities.
+ignore-imports=no
+
+# Minimum lines number of a similarity.
+min-similarity-lines=4
+
+
+[BASIC]
+
+# Naming hint for argument names
+argument-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct argument names
+argument-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Naming hint for attribute names
+attr-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct attribute names
+attr-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Bad variable names which should always be refused, separated by a comma
+bad-names=foo,bar,baz,toto,tutu,tata
+
+# Naming hint for class attribute names
+class-attribute-name-hint=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
+
+# Regular expression matching correct class attribute names
+class-attribute-rgx=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
+
+# Naming hint for class names
+# class-name-hint=[A-Z_][a-zA-Z0-9]+$
+class-name-hint=[A-Z_][a-zA-Z0-9_]+$
+
+# Regular expression matching correct class names
+# class-rgx=[A-Z_][a-zA-Z0-9]+$
+class-rgx=[A-Z_][a-zA-Z0-9_]+$
+
+# Naming hint for constant names
+const-name-hint=(([A-Z_][A-Z0-9_]*)|(__.*__))$
+
+# Regular expression matching correct constant names
+const-rgx=(([A-Z_][A-Z0-9_]*)|(__.*__))$
+
+# Minimum line length for functions/classes that require docstrings, shorter
+# ones are exempt.
+docstring-min-length=-1
+
+# Naming hint for function names
+function-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct function names
+function-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Good variable names which should always be accepted, separated by a comma
+# good-names=i,j,k,ex,Run,_
+good-names=r,g,b,i,j,k,n,ex,Run,_
+
+# Include a hint for the correct naming format with invalid-name
+include-naming-hint=no
+
+# Naming hint for inline iteration names
+inlinevar-name-hint=[A-Za-z_][A-Za-z0-9_]*$
+
+# Regular expression matching correct inline iteration names
+inlinevar-rgx=[A-Za-z_][A-Za-z0-9_]*$
+
+# Naming hint for method names
+method-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct method names
+method-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Naming hint for module names
+module-name-hint=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
+
+# Regular expression matching correct module names
+module-rgx=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
+
+# Colon-delimited sets of names that determine each other's naming style when
+# the name regexes allow several styles.
+name-group=
+
+# Regular expression which should only match function or class names that do
+# not require a docstring.
+no-docstring-rgx=^_
+
+# List of decorators that produce properties, such as abc.abstractproperty. Add
+# to this list to register other decorators that produce valid properties.
+property-classes=abc.abstractproperty
+
+# Naming hint for variable names
+variable-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct variable names
+variable-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+
+[IMPORTS]
+
+# Allow wildcard imports from modules that define __all__.
+allow-wildcard-with-all=no
+
+# Analyse import fallback blocks. This can be used to support both Python 2 and
+# 3 compatible code, which means that the block might have code that exists
+# only in one or another interpreter, leading to false positives when analysed.
+analyse-fallback-blocks=no
+
+# Deprecated modules which should not be used, separated by a comma
+deprecated-modules=optparse,tkinter.tix
+
+# Create a graph of external dependencies in the given file (report RP0402 must
+# not be disabled)
+ext-import-graph=
+
+# Create a graph of every (i.e. internal and external) dependencies in the
+# given file (report RP0402 must not be disabled)
+import-graph=
+
+# Create a graph of internal dependencies in the given file (report RP0402 must
+# not be disabled)
+int-import-graph=
+
+# Force import order to recognize a module as part of the standard
+# compatibility libraries.
+known-standard-library=
+
+# Force import order to recognize a module as part of a third party library.
+known-third-party=enchant
+
+
+[CLASSES]
+
+# List of method names used to declare (i.e. assign) instance attributes.
+defining-attr-methods=__init__,__new__,setUp
+
+# List of member names, which should be excluded from the protected access
+# warning.
+exclude-protected=_asdict,_fields,_replace,_source,_make
+
+# List of valid names for the first argument in a class method.
+valid-classmethod-first-arg=cls
+
+# List of valid names for the first argument in a metaclass class method.
+valid-metaclass-classmethod-first-arg=mcs
+
+
+[DESIGN]
+
+# Maximum number of arguments for function / method
+max-args=5
+
+# Maximum number of attributes for a class (see R0902).
+# max-attributes=7
+max-attributes=11
+
+# Maximum number of boolean expressions in a if statement
+max-bool-expr=5
+
+# Maximum number of branch for function / method body
+max-branches=12
+
+# Maximum number of locals for function / method body
+max-locals=15
+
+# Maximum number of parents for a class (see R0901).
+max-parents=7
+
+# Maximum number of public methods for a class (see R0904).
+max-public-methods=20
+
+# Maximum number of return / yield for function / method body
+max-returns=6
+
+# Maximum number of statements in function / method body
+max-statements=50
+
+# Minimum number of public methods for a class (see R0903).
+min-public-methods=2
+
+
+[EXCEPTIONS]
+
+# Exceptions that will emit a warning when being caught. Defaults to
+# "Exception"
+overgeneral-exceptions=Exception

.travis.yml

@@ -1,59 +1,30 @@
-# Travis CI configuration for automated .mpy file generation.
-# Version: 2.0 (support for both .mpy and packages)
-# Author: Tony DiCola
-# License: Public Domain
-# This configuration will work with Travis CI (travis-ci.org) to automacially
-# build .mpy files and packages for MicroPython when a new tagged release is
-# created.  This file is relatively generic and can be shared across multiple
-# repositories by following these steps:
-#   1. Copy this file into a .travis.yml file in the root of the repository.
-#   2. Change the deploy > file section below to list each of the .mpy files or
-#      package .zip files that should be generated.
-#      For each .mpy file listed the config will automatically look for .py files
-#      with the same name as the source for generating the .mpy files.  Note that
-#      the .mpy extension should be lower case!
-#      For each .zip file listed the config will assume a folder with the same
-#      name exists (minus the .zip extension) and will recursively walk the folder
-#      to generate .mpy versions of all .py files EXCEPT __init__.py (not supported
-#      right now because of a bug).  Then a zip of the directory will be generated
-#      with just the .mpy and __init__.py files.
-#   3. Commit the .travis.yml file and push it to GitHub.
-#   4. Go to travis-ci.org and find the repository (it needs to be setup to access
-#      your github account, and your github account needs access to write to the
-#      repo).  Flip the 'ON' switch on for Travis and the repo, see the Travis
-#      docs for more details: https://docs.travis-ci.com/user/getting-started/
-#   5. Get a GitHub 'personal access token' which has at least 'public_repo' or
-#      'repo' scope: https://help.github.com/articles/creating-an-access-token-for-command-line-use/
-#      Keep this token safe and secure!  Anyone with the token will be able to
-#      access and write to your GitHub repositories.  Travis will use the token
-#      to attach the .mpy files to the release.
-#   6. In the Travis CI settings for the repository that was enabled find the
-#      environment variable editing page: https://docs.travis-ci.com/user/environment-variables/#Defining-Variables-in-Repository-Settings
-#      Add an environment variable named GITHUB_TOKEN and set it to the value
-#      of the GitHub personal access token above.  Keep 'Display value in build
-#      log' flipped off.
-#   7. That's it!  Tag a release and Travis should go to work to add .mpy files
-#      to the release.  It takes about a 2-3 minutes for a worker to spin up,
-#      build mpy-cross, and add the binaries to the release.
-language: generic
+# This is a common .travis.yml for generating library release zip files for
+# CircuitPython library releases using circuitpython-build-tools.
+# See https://github.com/adafruit/circuitpython-build-tools for detailed setup
+# instructions.
 
-sudo: true
+dist: trusty
+sudo: false
+language: python
+python:
+    - "3.6"
+
+cache:
+    pip: true
 
 deploy:
   provider: releases
   api_key: $GITHUB_TOKEN
-  file:
-  - adafruit_circuitplayground.zip
+  file_glob: true
+  file: bundles/*
   skip_cleanup: true
   on:
     tags: true
 
-before_install:
-  - wget https://raw.githubusercontent.com/adafruit/MicroPython_TravisCI_Deploy/master/install_dependencies.sh
-  - chmod +x install_dependencies.sh
-  - source install_dependencies.sh
+install:
+  - pip install pylint circuitpython-build-tools
 
-before_deploy:
-  - wget https://raw.githubusercontent.com/adafruit/MicroPython_TravisCI_Deploy/master/build_release.sh
-  - chmod +x build_release.sh
-  - ./build_release.sh
+script:
+  - pylint adafruit_circuitplayground/*.py
+  - ([[ ! -d "examples" ]] || pylint --disable=missing-docstring,invalid-name examples/*.py)
+  - circuitpython-build-bundles --filename_prefix adafruit-circuitpython-circuitplayground --library_location .

adafruit_circuitplayground/express.py

@@ -1,35 +1,78 @@
+# The MIT License (MIT)
+#
+# Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
+# Copyright (c) 2017 Kattni Rembor for Adafruit Industries
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+# We have a lot of attributes for this complex sensor.
+# pylint: disable=too-many-instance-attributes
+
+"""
+`adafruit_circuitplayground.express`
+====================================================
+
+CircuitPython driver from `CircuitPlayground Express <https://www.adafruit.com/product/3333>`_.
+
+* Author(s): Kattni Rembor, Scott Shawcroft
+"""
+
+import array
+import math
 import sys
+import time
+# pylint: disable=wrong-import-position
 sys.path.insert(0, ".frozen")  # prefer frozen modules over local
 
 import adafruit_lis3dh
 import adafruit_thermistor
 import analogio
-import array
 import audioio
 import board
 import busio
 import digitalio
-import math
 import neopixel
-import time
 import touchio
 
+__version__ = "0.0.0-auto.0"
+__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_CircuitPlayground.git"
+
 
 class Photocell:
+    """Simple driver for analog photocell on the CircuitPlayground Express."""
+    # pylint: disable=too-few-public-methods
     def __init__(self, pin):
         self._photocell = analogio.AnalogIn(pin)
 
     # TODO(tannewt): Calibrate this against another calibrated sensor.
     @property
-    def value(self):
+    def light(self):
+        """Light level in SI Lux."""
         return self._photocell.value * 330 // (2 ** 16)
 
 class Express:
     """Represents a single CircuitPlayground Express. Do not use more than one at
        a time."""
     def __init__(self):
-        # Only create the circuit module member when we're aren't being imported by Sphinx
-        if "__module__" in dir(digitalio.DigitalInOut) and digitalio.DigitalInOut.__module__ == "sphinx.ext.autodoc":
+        # Only create the cpx module member when we're aren't being imported by Sphinx
+        if ("__module__" in dir(digitalio.DigitalInOut) and
+                digitalio.DigitalInOut.__module__ == "sphinx.ext.autodoc"):
             return
         self._a = digitalio.DigitalInOut(board.BUTTON_A)
         self._a.switch_to_input(pull=digitalio.Pull.DOWN)
@@ -52,10 +95,14 @@ class Express:
         # Define audio:
         self._speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
         self._speaker_enable.switch_to_output(value=False)
-        self.sample = None
-        self.sine_wave = None
+        self._sample = None
+        self._sine_wave = None
 
         # Define touch:
+        # We chose these verbose touch_A# names so that beginners could use it without understanding
+        # lists and the capital A to match the pin name. The capitalization is not strictly Python
+        # style, so everywhere we use these names, we whitelist the errors using:
+        # pylint: disable=invalid-name
         self._touch_A1 = None
         self._touch_A2 = None
         self._touch_A3 = None
@@ -68,6 +115,11 @@ class Express:
         self._i2c = busio.I2C(board.ACCELEROMETER_SCL, board.ACCELEROMETER_SDA)
         self._lis3dh = adafruit_lis3dh.LIS3DH_I2C(self._i2c, address=0x19)
         self._lis3dh.range = adafruit_lis3dh.RANGE_8_G
+
+        # Enables FIFO stream mode and then sets it to stream mode.
+        # TODO(tdicola): Replace this with code that doesn't call an internal (starts with _)
+        # method. https://github.com/adafruit/Adafruit_CircuitPython_LIS3DH/issues/14
+        # pylint: disable=protected-access
         self._lis3dh._write_register_byte(adafruit_lis3dh.REG_CTRL5, 0b01001000)
         self._lis3dh._write_register_byte(0x2E, 0b10000000)
 
@@ -124,7 +176,7 @@ class Express:
 
 
     @property
-    def touch_A1(self):
+    def touch_A1(self): # pylint: disable=invalid-name
         """Detect touch on capacitive touch pad A1.
 
         .. image :: /_static/capacitive_touch_pad_A1.jpg
@@ -143,7 +195,7 @@ class Express:
         return self._touch_A1.value
 
     @property
-    def touch_A2(self):
+    def touch_A2(self): # pylint: disable=invalid-name
         """Detect touch on capacitive touch pad A2.
 
         .. image :: /_static/capacitive_touch_pad_A2.jpg
@@ -162,7 +214,7 @@ class Express:
         return self._touch_A2.value
 
     @property
-    def touch_A3(self):
+    def touch_A3(self): # pylint: disable=invalid-name
         """Detect touch on capacitive touch pad A3.
 
         .. image :: /_static/capacitive_touch_pad_A3.jpg
@@ -181,7 +233,7 @@ class Express:
         return self._touch_A3.value
 
     @property
-    def touch_A4(self):
+    def touch_A4(self): # pylint: disable=invalid-name
         """Detect touch on capacitive touch pad A4.
 
         .. image :: /_static/capacitive_touch_pad_A4.jpg
@@ -200,7 +252,7 @@ class Express:
         return self._touch_A4.value
 
     @property
-    def touch_A5(self):
+    def touch_A5(self): # pylint: disable=invalid-name
         """Detect touch on capacitive touch pad A5.
 
         .. image :: /_static/capacitive_touch_pad_A5.jpg
@@ -219,7 +271,7 @@ class Express:
         return self._touch_A5.value
 
     @property
-    def touch_A6(self):
+    def touch_A6(self): # pylint: disable=invalid-name
         """Detect touch on capacitive touch pad A6.
 
         .. image :: /_static/capacitive_touch_pad_A6.jpg
@@ -238,7 +290,7 @@ class Express:
         return self._touch_A6.value
 
     @property
-    def touch_A7(self):
+    def touch_A7(self): # pylint: disable=invalid-name
         """Detect touch on capacitive touch pad A7.
 
         .. image :: /_static/capacitive_touch_pad_A7.jpg
@@ -381,7 +433,7 @@ class Express:
                  print("Lux:", cpx.light)
                  time.sleep(1)
         """
-        return self._light.value
+        return self._light.light
 
     @property
     def red_led(self):
@@ -409,17 +461,17 @@ class Express:
 
     @staticmethod
     def _sine_sample(length):
-        TONE_VOLUME = (2 ** 15) - 1
+        tone_volume = (2 ** 15) - 1
         shift = 2 ** 15
         for i in range(length):
-            yield int(TONE_VOLUME * math.sin(2*math.pi*(i / length)) + shift)
+            yield int(tone_volume * math.sin(2*math.pi*(i / length)) + shift)
 
     def _generate_sample(self):
-        if self.sample is not None:
+        if self._sample is not None:
             return
         length = 100
-        self.sine_wave = array.array("H", Express._sine_sample(length))
-        self.sample = audioio.AudioOut(board.SPEAKER, self.sine_wave)
+        self._sine_wave = array.array("H", Express._sine_sample(length))
+        self._sample = audioio.AudioOut(board.SPEAKER, self._sine_wave)
 
     def play_tone(self, frequency, duration):
         """ Produce a tone using the speaker. Try changing frequency to change
@@ -466,9 +518,9 @@ class Express:
         self._speaker_enable.value = True
         self._generate_sample()
         # Start playing a tone of the specified frequency (hz).
-        self.sample.frequency = int(len(self.sine_wave) * frequency)
-        if not self.sample.playing:
-            self.sample.play(loop=True)
+        self._sample.frequency = int(len(self._sine_wave) * frequency)
+        if not self._sample.playing:
+            self._sample.play(loop=True)
 
     def stop_tone(self):
         """ Use with start_tone to stop the tone produced.
@@ -489,8 +541,8 @@ class Express:
                      cpx.stop_tone()
         """
         # Stop playing any tones.
-        if self.sample is not None and self.sample.playing:
-            self.sample.stop()
+        if self._sample is not None and self._sample.playing:
+            self._sample.stop()
         self._speaker_enable.value = False
 
     def play_file(self, file_name):
@@ -513,15 +565,15 @@ class Express:
         """
         # Play a specified file.
         self._speaker_enable.value = True
-        self.a = audioio.AudioOut(board.SPEAKER, open(file_name, "rb"))
+        audio = audioio.AudioOut(board.SPEAKER, open(file_name, "rb"))
 
-        self.a.play()
-        while self.a.playing:
+        audio.play()
+        while audio.playing:
             pass
         self._speaker_enable.value = False
 
 
-cpx = Express()
+cpx = Express() # pylint: disable=invalid-name
 """Object that is automatically created on import.
 
    To use, simply import it from the module:

readthedocs.yml

@@ -1,2 +1,3 @@
+python:
+    version: 3
 requirements_file: requirements.txt
-