Fixes #220 for platforms that do not support typing

.readthedocs.yaml

@@ -9,7 +9,7 @@
 version: 2
 
 python:
-  version: "3.6"
+  version: "3.7"
   install:
     - requirements: docs/requirements.txt
     - requirements: requirements.txt

README.rst

@@ -41,7 +41,7 @@ Dependencies
 =============
 This driver depends on:
 
-* Python 3.6 or higher
+* Python 3.7 or higher
 
 Installing from PyPI
 =====================

adafruit_platformdetect/__init__.py

@@ -6,7 +6,11 @@
 Attempt to detect the current platform.
 """
 import re
-from typing import Optional
+
+try:
+    from typing import Optional
+except ImportError:
+    pass
 from .board import Board
 from .chip import Chip
 

adafruit_platformdetect/board.py

@@ -16,19 +16,25 @@
 
 **Software and Dependencies:**
 
-* Linux and Python 3.6 or Higher
+* Linux and Python 3.7 or Higher
 
 """
 
 # imports
-from __future__ import annotations
 import os
 import re
-from typing import Optional, TYPE_CHECKING
+
+try:
+    from typing import TYPE_CHECKING, Optional
+except ImportError:
+    TYPE_CHECKING = False
+
 from .constants import boards, chips
 
 if TYPE_CHECKING:
-    from . import Detector
+    from .protocols import DetectorProtocol
+else:
+    DetectorProtocol = ...
 
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_PlatformDetect.git"
@@ -37,7 +43,8 @@
 class Board:
     """Attempt to detect specific boards."""
 
-    def __init__(self, detector: Detector) -> None:
+    # pylint: disable=used-before-assignment
+    def __init__(self, detector: DetectorProtocol) -> None:
         self.detector = detector
         self._board_id = None
 

adafruit_platformdetect/chip.py

@@ -20,14 +20,20 @@
 """
 
 # imports
-from __future__ import annotations
 import os
 import sys
-from typing import Optional, TYPE_CHECKING
+
+try:
+    from typing import TYPE_CHECKING, Optional
+except ImportError:
+    TYPE_CHECKING = False
+
 from .constants import chips
 
 if TYPE_CHECKING:
-    from . import Detector
+    from .protocols import DetectorProtocol
+else:
+    DetectorProtocol = ...
 
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_PlatformDetect.git"
@@ -36,7 +42,8 @@
 class Chip:
     """Attempt detection of current chip / CPU."""
 
-    def __init__(self, detector: Detector) -> None:
+    # pylint: disable=used-before-assignment
+    def __init__(self, detector: DetectorProtocol) -> None:
         self.detector = detector
         self._chip_id = None
 

adafruit_platformdetect/protocols.py

@@ -0,0 +1,80 @@
+# SPDX-FileCopyrightText: 2022 Chris Wilson <[email protected]>
+#
+# SPDX-License-Identifier: MIT
+
+"""
+`adafruit_platformdetect.protocols`
+================================================================================
+
+Protocol definitions
+
+* Author(s): Chris Wilson
+
+Implementation Notes
+--------------------
+
+**Software and Dependencies:**
+
+* Linux and Python 3.7 or Higher
+
+"""
+
+from typing import Optional
+
+# Protocol was introduced in Python 3.8.
+try:
+    from typing import Protocol
+except ImportError:
+    from typing_extensions import Protocol
+
+
+class DetectorProtocol(Protocol):
+    """Wrap various platform detection functions."""
+
+    def get_cpuinfo_field(self, field: str) -> Optional[str]:
+        """
+        Search /proc/cpuinfo for a field and return its value, if found,
+        otherwise None.
+        """
+        ...
+
+    def check_dt_compatible_value(self, value: str) -> bool:
+        """
+        Search /proc/device-tree/compatible for a value and return True, if found,
+        otherwise False.
+        """
+        ...
+
+    def get_armbian_release_field(self, field: str) -> Optional[str]:
+        """
+        Search /etc/armbian-release, if it exists, for a field and return its
+        value, if found, otherwise None.
+        """
+        ...
+
+    def get_device_model(self) -> Optional[str]:
+        """
+        Search /proc/device-tree/model for the device model and return its value, if found,
+        otherwise None.
+        """
+        ...
+
+    def get_device_compatible(self) -> Optional[str]:
+        """
+        Search /proc/device-tree/compatible for the compatible chip name.
+        """
+        ...
+
+    def check_board_asset_tag_value(self) -> Optional[str]:
+        """
+        Search /sys/devices/virtual/dmi/id for the device model and return its value, if found,
+        otherwise None.
+        """
+        ...
+
+    def check_board_name_value(self) -> Optional[str]:
+        """
+        Search /sys/devices/virtual/dmi/id for the board name and return its value, if found,
+        otherwise None. Debian/ubuntu based
+        """
+        ...

bin/detect.py

@@ -15,7 +15,7 @@
 
 **Software and Dependencies:**
 
-* Linux and Python 3.5 or Higher
+* Linux and Python 3.7 or Higher
 
 """
 

docs/conf.py

@@ -27,7 +27,7 @@
 autodoc_mock_imports = ["machine"]
 
 intersphinx_mapping = {
-    "python": ("https://docs.python.org/3.6", None),
+    "python": ("https://docs.python.org/3.7", None),
     "CircuitPython": ("https://circuitpython.readthedocs.io/en/latest/", None),
 }
 

requirements.txt

@@ -0,0 +1,5 @@
+# SPDX-FileCopyrightText: 2022 Chris Wilson <[email protected]>
+#
+# SPDX-License-Identifier: MIT
+
+typing_extensions; python_version <= '3.7'

setup.py

@@ -28,12 +28,12 @@
     description="Platform detection for use by libraries like Adafruit-Blinka.",
     long_description=long_description,
     long_description_content_type="text/x-rst",
-    python_requires=">=3.6.0",
+    python_requires=">=3.7.0",
     url="https://github.com/adafruit/Adafruit_Python_PlatformDetect",
     # If your package is a single module, use this instead of 'packages':
     author="Adafruit Industries",
     author_email="[email protected]",
-    install_requires=[],
+    install_requires=["typing_extensions; python_version <= '3.7'"],
     # Choose your license
     license="MIT",
     # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
@@ -44,7 +44,7 @@
         "Topic :: System :: Hardware",
         "License :: OSI Approved :: MIT License",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
     ],
     packages=["adafruit_platformdetect", "adafruit_platformdetect.constants"],
 )