pythonimportusbpyusb

python pyusb import usb.core doesn't work

I am following this tutorial (http://pyusb.sourceforge.net/docs/1.0/tutorial.html)

I am on windows xp sp3, my python version is 2.7 and I downloaded and installed the pyusb-1.0.0-a1.zip

and libusb-win32-bin-1.2.4.0.zip

import usb

This works fine but

import usb.core

This doesn't work at all. The error message says

Traceback (most recent call last):
  File "D:\py\usb.py", line 1, in <module>
    from usb import core
  File "D:\py\usb.py", line 1, in <module>
    from usb import core
ImportError: cannot import name core

p.s. "from usb import core" this make

Traceback (most recent call last):
  File "D:\py\usb.py", line 1, in <module>
    from usb import core
  File "D:\py\usb.py", line 1, in <module>
    from usb import core
ImportError: cannot import name core

full source code is here

from usb import core
#find device
dev = usb.core.find(idVendor=0x1516, idProduct=0x8628)
#found?
if dev is None :
        raise ValueError('device not found')

#set the active config. with no args, the first config will be the active one

dev.set_configuration()

#get an end point instance
ep = usb.util.find_descriptor(
    dev.get_interface_altsetting(), #first interface
    #match the first Out Endpoint
    custom_match = \
        lambda e: \
            usb.util.endpoint_direction(e.bEndpointAddress) == \
            usb.util.ENDPOINT_OUT)
assert ep is not None

while(1):
    ep.write(0x5553424350DDBC880000000000000600000000000000000000000000000000)
    ep.write(0x5553425350ddbc880000000000)
Solution

  • In both cases error is:

    Traceback (most recent call last):
  File "D:\py\usb.py", line 1, in <module>

    which means it has file usb.py in PATH earlier (probably in . which is D:\py\ in this case) than path to python modules.

    Did you install this module properly? Try rename this usb.py file to something else, you'll see if the error becomes "ImportError: No module named usb". Also check Python install path (something like C:\Python27\) for usb folder i.e. <python_path>\lib\site-packages\usb\core.py.