Simple way to query connected USB devices info in Python?
Question: How can we query connected USB devices info in Python? I want to get UID
Device Name (ex: SonyEricsson W660), path to device (ex: /dev/ttyACM0)

And also what would be the best Parameter out of above info to be used as
identifying the device whenever it's connected again? (UID?)

I am working on Ubuntu 11.04.

ATM I have this code (using pyUSB)

    
    
    busses = usb.busses()
    for bus in busses:
      devices = bus.devices
      for dev in devices:
        print repr(dev)
        print "Device:", dev.filename
        print "  idVendor: %d (0x%04x)" % (dev.idVendor, dev.idVendor)
        print "  idProduct: %d (0x%04x)" % (dev.idProduct, dev.idProduct)
        print "Manufacturer:", dev.iManufacturer
        print "Serial:", dev.iSerialNumber
        print "Product:", dev.iProduct
    

The problem is I don't get desired output, will paste one example:

    
    
    <usb.legacy.Device object at 0x1653990>
    Device: 
      idVendor: 4046 (0x0fce)
      idProduct: 53411 (0xd0a3)
    Manufacturer: 1
    Serial: 3
    Product: 2
    

First I don't get filename, it's most important to me. I am assuming it is the
/dev/ttyACM0 etc part. Second, I guess there was some UID of every USB device,
or I should use both Vendor or Product id?

**EDIT: Apparently I have some setup issues, I think I am using wrong USB
Library. (using libusb0.1) ATM. That's why I get Device (dev.filename) string
empty. If someone can please just tell that on what operating system he is
using what USB Library and what version of PyUSB I think it will solve my
problems.**


Answer: I can think of a quick code like this.

Since all USB ports can be accessed via /dev/bus/usb/< bus >/< device >

For the ID generated, even if you unplug the device and reattach it [ could be
some other port ]. It will be the same.

    
    
    import re
    import subprocess
    device_re = re.compile("Bus\s+(?P<bus>\d+)\s+Device\s+(?P<device>\d+).+ID\s(?P<id>\w+:\w+)\s(?P<tag>.+)$", re.I)
    df = subprocess.check_output("lsusb")
    devices = []
    for i in df.split('\n'):
        if i:
            info = device_re.match(i)
            if info:
                dinfo = info.groupdict()
                dinfo['device'] = '/dev/bus/usb/%s/%s' % (dinfo.pop('bus'), dinfo.pop('device'))
                devices.append(dinfo)
    print devices
    

Sample output here will be:

    
    
    [
    {'device': '/dev/bus/usb/001/009', 'tag': 'Apple, Inc. Optical USB Mouse [Mitsumi]', 'id': '05ac:0304'},
    {'device': '/dev/bus/usb/001/001', 'tag': 'Linux Foundation 2.0 root hub', 'id': '1d6b:0002'},
    {'device': '/dev/bus/usb/001/002', 'tag': 'Intel Corp. Integrated Rate Matching Hub', 'id': '8087:0020'},
    {'device': '/dev/bus/usb/001/004', 'tag': 'Microdia ', 'id': '0c45:641d'}
    ]
    

