Python script to detect whether an FT232H or MCP2221 USB-to-serial adaptor is connected, for Adafruit Blinka

detect.py

#!/usr/bin/env python3

# Requirements:
#    pip install pyftdi
#    pip install hid
#    brew install hidapi

from os import environ
from pyftdi.usbtools import UsbTools
count = len(UsbTools.find_all([(0x0403, 0x6014)]))
if count != 0:
    print("Setting BLINKA_FT232H")
    environ.set("BLINKA_FT232H")
    exit()

from hid import enumerate
for dev in enumerate():
    if dev["vendor_id"] == 0x04D8 and dev["product_id"] == 0x00DD:
        print("Setting BLINKA_MCP2221")
        environ.set("BLINKA_MCP2221")
        exit()

print("No device variable set")