Type annotations

adafruit_bluefruit_connect/_xyz_packet.py

@@ -12,6 +12,8 @@
 
 """
 
+from __future__ import annotations
+
 import struct
 
 from .packet import Packet
@@ -20,37 +22,37 @@
 class _XYZPacket(Packet):
     """A packet of x, y, z float values. Used for several different Bluefruit controller packets."""
 
-    _FMT_PARSE = "<xxfffx"
-    PACKET_LENGTH = struct.calcsize(_FMT_PARSE)
+    _FMT_PARSE: str = "<xxfffx"
+    PACKET_LENGTH: int = struct.calcsize(_FMT_PARSE)
     # _FMT_CONSTRUCT doesn't include the trailing checksum byte.
-    _FMT_CONSTRUCT = "<2sfff"
+    _FMT_CONSTRUCT: str = "<2sfff"
     # _TYPE_HEADER is set by each concrete subclass.
 
-    def __init__(self, x, y, z):
+    def __init__(self, x: float, y: float, z: float) -> None:
         # Construct an _XYZPacket subclass object
         # from the given x, y, and z float values, and type character.
         self._x = x
         self._y = y
         self._z = z
 
-    def to_bytes(self):
+    def to_bytes(self) -> bytes:
         """Return the bytes needed to send this packet."""
         partial_packet = struct.pack(
             self._FMT_CONSTRUCT, self._TYPE_HEADER, self._x, self._y, self._z
         )
         return self.add_checksum(partial_packet)
 
     @property
-    def x(self):
+    def x(self) -> float:
         """The x value."""
         return self._x
 
     @property
-    def y(self):
+    def y(self) -> float:
         """The y value."""
         return self._y
 
     @property
-    def z(self):
+    def z(self) -> float:
         """The z value."""
         return self._z

adafruit_bluefruit_connect/accelerometer_packet.py

@@ -12,14 +12,16 @@
 
 """
 
+from __future__ import annotations
+
 from ._xyz_packet import _XYZPacket
 
 
 class AccelerometerPacket(_XYZPacket):
     """A packet of x, y, z float values from an accelerometer."""
 
     # Everything else is handled by _XYZPacket.
-    _TYPE_HEADER = b"!A"
+    _TYPE_HEADER: bytes = b"!A"
 
 
 # Register this class with the superclass. This allows the user to import only what is needed.

adafruit_bluefruit_connect/button_packet.py

@@ -13,39 +13,46 @@
 
 """
 
+from __future__ import annotations
+
 import struct
 
 from .packet import Packet
 
+try:
+    from typing import Optional  # adjust these as needed
+except ImportError:
+    pass
+
 
 class ButtonPacket(Packet):
     """A packet containing a button name and its state."""
 
-    BUTTON_1 = "1"
+    BUTTON_1: str = "1"
     """Code for Button 1 on the Bluefruit LE Connect app Control Pad screen."""
-    BUTTON_2 = "2"
+    BUTTON_2: str = "2"
     """Button 2."""
-    BUTTON_3 = "3"
+    BUTTON_3: str = "3"
     """Button 3."""
-    BUTTON_4 = "4"
+    BUTTON_4: str = "4"
     """Button 4."""
     # pylint: disable= invalid-name
-    UP = "5"
+    UP: str = "5"
     """Up Button."""
-    DOWN = "6"
+    DOWN: str = "6"
     """Down Button."""
-    LEFT = "7"
+    LEFT: str = "7"
     """Left Button."""
-    RIGHT = "8"
+    RIGHT: str = "8"
     """Right Button."""
 
-    _FMT_PARSE = "<xxssx"
-    PACKET_LENGTH = struct.calcsize(_FMT_PARSE)
+    _FMT_PARSE: str = "<xxssx"
+    PACKET_LENGTH: int = struct.calcsize(_FMT_PARSE)
     # _FMT_CONSTRUCT doesn't include the trailing checksum byte.
-    _FMT_CONSTRUCT = "<2sss"
-    _TYPE_HEADER = b"!B"
+    _FMT_CONSTRUCT: str = "<2sss"
+    _TYPE_HEADER: bytes = b"!B"
 
-    def __init__(self, button, pressed):
+    def __init__(self, button: str, pressed: bool) -> None:
         """Construct a ButtonPacket from a button name and the button's state.
 
         :param str button: a single character denoting the button
@@ -59,11 +66,11 @@ def __init__(self, button, pressed):
         except Exception as err:
             raise ValueError("Button must be a single char.") from err
 
-        self._button = button
-        self._pressed = pressed
+        self._button: str = button
+        self._pressed: bool = pressed
 
     @classmethod
-    def parse_private(cls, packet):
+    def parse_private(cls, packet: bytes) -> Optional[Packet]:
         """Construct a ButtonPacket from an incoming packet.
         Do not call this directly; call Packet.from_bytes() instead.
         pylint makes it difficult to call this method _parse(), hence the name.
@@ -73,9 +80,9 @@ def parse_private(cls, packet):
             raise ValueError("Bad button press/release value")
         return cls(chr(button[0]), pressed == b"1")
 
-    def to_bytes(self):
+    def to_bytes(self) -> bytes:
         """Return the bytes needed to send this packet."""
-        partial_packet = struct.pack(
+        partial_packet: bytes = struct.pack(
             self._FMT_CONSTRUCT,
             self._TYPE_HEADER,
             bytes(self._button, "utf-8"),
@@ -84,13 +91,13 @@ def to_bytes(self):
         return self.add_checksum(partial_packet)
 
     @property
-    def button(self):
+    def button(self) -> str:
         """A single character string (not bytes) specifying the button that
         the user pressed or released."""
         return self._button
 
     @property
-    def pressed(self):
+    def pressed(self) -> bool:
         """``True`` if button is pressed, or ``False`` if it is released."""
         return self._pressed
 

adafruit_bluefruit_connect/color_packet.py

@@ -12,51 +12,58 @@
 
 """
 
+from __future__ import annotations
+
 import struct
 
 from .packet import Packet
 
+try:
+    from typing import Optional, Tuple  # adjust these as needed
+except ImportError:
+    pass
+
 
 class ColorPacket(Packet):
     """A packet containing an RGB color value."""
 
-    _FMT_PARSE = "<xx3Bx"
-    PACKET_LENGTH = struct.calcsize(_FMT_PARSE)
+    _FMT_PARSE: str = "<xx3Bx"
+    PACKET_LENGTH: int = struct.calcsize(_FMT_PARSE)
     # _FMT_CONSTRUCT doesn't include the trailing checksum byte.
-    _FMT_CONSTRUCT = "<2s3B"
-    _TYPE_HEADER = b"!C"
+    _FMT_CONSTRUCT: str = "<2s3B"
+    _TYPE_HEADER: bytes = b"!C"
 
-    def __init__(self, color):
+    def __init__(self, color: Tuple) -> None:
         """Construct a ColorPacket from a 3-element :class:`tuple` of RGB
         values, or from an int color value 0xRRGGBB.
 
         :param tuple/int color: an RGB :class:`tuple` ``(red, green, blue)``
           or an int color value ``0xRRGGBB``
         """
         if isinstance(color, int):
-            self._color = tuple(color.to_bytes(3, "big"))
+            self._color: Tuple = tuple(color.to_bytes(3, "big"))
         elif len(color) == 3 and all(0 <= c <= 255 for c in color):
             self._color = color
         else:
             raise ValueError("Color must be an integer 0xRRGGBB or a tuple(r,g,b)")
 
     @classmethod
-    def parse_private(cls, packet):
+    def parse_private(cls, packet: bytes) -> Optional[Packet]:
         """Construct a ColorPacket from an incoming packet.
         Do not call this directly; call Packet.from_bytes() instead.
         pylint makes it difficult to call this method _parse(), hence the name.
         """
         return cls(struct.unpack(cls._FMT_PARSE, packet))
 
-    def to_bytes(self):
+    def to_bytes(self) -> bytes:
         """Return the bytes needed to send this packet."""
         partial_packet = struct.pack(
             self._FMT_CONSTRUCT, self._TYPE_HEADER, *self._color
         )
         return self.add_checksum(partial_packet)
 
     @property
-    def color(self):
+    def color(self) -> tuple:
         """A :class:`tuple` ``(red, green blue)`` representing the color the
         user chose in the BlueFruit Connect app."""
         return self._color

adafruit_bluefruit_connect/gyro_packet.py

@@ -12,14 +12,16 @@
 
 """
 
+from __future__ import annotations
+
 from ._xyz_packet import _XYZPacket
 
 
 class GyroPacket(_XYZPacket):
     """A packet of x, y, z float values from a gyroscope."""
 
     # Everything else is handled by _XYZPacket.
-    _TYPE_HEADER = b"!G"
+    _TYPE_HEADER: bytes = b"!G"
 
 
 # Register this class with the superclass. This allows the user to import only what is needed.

adafruit_bluefruit_connect/location_packet.py

@@ -12,6 +12,8 @@
 
 """
 
+from __future__ import annotations
+
 import struct
 
 from .packet import Packet
@@ -20,19 +22,19 @@
 class LocationPacket(Packet):
     """A packet of latitude, longitude, and altitude values."""
 
-    _FMT_PARSE = "<xxfffx"
-    PACKET_LENGTH = struct.calcsize(_FMT_PARSE)
+    _FMT_PARSE: str = "<xxfffx"
+    PACKET_LENGTH: int = struct.calcsize(_FMT_PARSE)
     # _FMT_CONSTRUCT doesn't include the trailing checksum byte.
-    _FMT_CONSTRUCT = "<2sfff"
-    _TYPE_HEADER = b"!L"
+    _FMT_CONSTRUCT: str = "<2sfff"
+    _TYPE_HEADER: bytes = b"!L"
 
-    def __init__(self, latitude, longitude, altitude):
+    def __init__(self, latitude: float, longitude: float, altitude: float) -> None:
         """Construct a LocationPacket from the given values."""
         self._latitude = latitude
         self._longitude = longitude
         self._altitude = altitude
 
-    def to_bytes(self):
+    def to_bytes(self) -> bytes:
         """Return the bytes needed to send this packet."""
         partial_packet = struct.pack(
             self._FMT_CONSTRUCT,
@@ -44,17 +46,17 @@ def to_bytes(self):
         return self.add_checksum(partial_packet)
 
     @property
-    def latitude(self):
+    def latitude(self) -> float:
         """The latitude value."""
         return self._latitude
 
     @property
-    def longitude(self):
+    def longitude(self) -> float:
         """The longitude value."""
         return self._longitude
 
     @property
-    def altitude(self):
+    def altitude(self) -> float:
         """The altitude value."""
         return self._altitude
 

adafruit_bluefruit_connect/magnetometer_packet.py

@@ -12,14 +12,16 @@
 
 """
 
+from __future__ import annotations
+
 from ._xyz_packet import _XYZPacket
 
 
 class MagnetometerPacket(_XYZPacket):
     """A packet of x, y, z float values from a magnetometer."""
 
     # Everything else is handled by _XYZPacket.
-    _TYPE_HEADER = b"!M"
+    _TYPE_HEADER: bytes = b"!M"
 
 
 # Register this class with the superclass. This allows the user to import only what is needed.