initial import from https://github.com/padelt/temper-python/

temper.py

+#!/usr/bin/python
+# encoding: utf-8
+#
+# Handles devices reporting themselves as USB VID/PID 0C45:7401 (mine also says RDing TEMPerV1.2).
+#
+# Copyright 2012, 2013 Philipp Adelt <info@philipp.adelt.net>
+#
+# This code is licensed under the GNU public license (GPL). See LICENSE.md for details.
+
+import usb
+import sys
+import struct
+
+VIDPIDs = [(0x0c45L,0x7401L)]
+REQ_INT_LEN = 8
+REQ_BULK_LEN = 8
+TIMEOUT = 2000
+
+class TemperDevice():
+    def __init__(self, device):
+        self._device = device
+        self._handle = None
+
+    def get_temperature(self, format='celsius'):
+        try:
+            if not self._handle:
+                self._handle = self._device.open()
+                try:
+                    self._handle.detachKernelDriver(0)
+                except usb.USBError:
+                    pass
+                try:
+                    self._handle.detachKernelDriver(1)
+                except usb.USBError:
+                    pass
+                self._handle.setConfiguration(1)
+                self._handle.claimInterface(0)
+                self._handle.claimInterface(1)
+                self._handle.controlMsg(requestType=0x21, request=0x09, value=0x0201, index=0x00, buffer="\x01\x01", timeout=TIMEOUT) # ini_control_transfer
+
+            self._control_transfer(self._handle, "\x01\x80\x33\x01\x00\x00\x00\x00") # uTemperatura
+            self._interrupt_read(self._handle)
+            self._control_transfer(self._handle, "\x01\x82\x77\x01\x00\x00\x00\x00") # uIni1
+            self._interrupt_read(self._handle)
+            self._control_transfer(self._handle, "\x01\x86\xff\x01\x00\x00\x00\x00") # uIni2
+            self._interrupt_read(self._handle)
+            self._interrupt_read(self._handle)
+            self._control_transfer(self._handle, "\x01\x80\x33\x01\x00\x00\x00\x00") # uTemperatura
+            data = self._interrupt_read(self._handle)
+            data_s = "".join([chr(byte) for byte in data])
+            temp_c = 125.0/32000.0*(struct.unpack('>h', data_s[2:4])[0])
+            if format == 'celsius':
+                return temp_c
+            elif format == 'fahrenheit':
+                return temp_c*1.8+32.0
+            elif format == 'millicelsius':
+                return int(temp_c*1000)
+            else:
+                raise ValueError("Unknown format")
+        except usb.USBError, e:
+            self.close()
+            if "not permitted" in str(e):
+                raise Exception("Permission problem accessing USB. Maybe I need to run as root?")
+            else:
+                raise
+
+    def close(self):
+        if self._handle:
+            try:
+                self._handle.releaseInterface()
+            except ValueError:
+                pass
+            self._handle = None
+
+    def _control_transfer(self, handle, data):
+        handle.controlMsg(requestType=0x21, request=0x09, value=0x0200, index=0x01, buffer=data, timeout=TIMEOUT)
+
+    def _interrupt_read(self, handle):
+        return handle.interruptRead(0x82, REQ_INT_LEN)
+
+
+class TemperHandler():
+    def __init__(self):
+        busses = usb.busses()
+        self._devices = []
+        for bus in busses:
+            self._devices.extend([TemperDevice(x) for x in bus.devices if (x.idVendor,x.idProduct) in VIDPIDs])
+
+    def get_devices(self):
+        return self._devices
+
+if __name__ == '__main__':
+    th = TemperHandler()
+    devs = th.get_devices()
+    print "Found %i devices" % len(devs)
+    for i, dev in enumerate(devs):
+        print "Device #%i: %0.1f°C %0.1f°F" % (i, dev.get_temperature(), dev.get_temperature(format="fahrenheit"))