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Groups > comp.lang.python > #12702 > unrolled thread

Reading pen drive data

Started bymukesh tiwari <mukeshtiwari.iiitm@gmail.com>
First post2011-09-03 07:40 -0700
Last post2011-09-03 18:16 +0100
Articles 3 — 2 participants

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  Reading pen drive data mukesh tiwari <mukeshtiwari.iiitm@gmail.com> - 2011-09-03 07:40 -0700
    Re: Reading pen drive data mukesh tiwari <mukeshtiwari.iiitm@gmail.com> - 2011-09-03 09:21 -0700
      Re: Reading pen drive data MRAB <python@mrabarnett.plus.com> - 2011-09-03 18:16 +0100

#12702 — Reading pen drive data

Frommukesh tiwari <mukeshtiwari.iiitm@gmail.com>
Date2011-09-03 07:40 -0700
SubjectReading pen drive data
Message-ID<3c05935f-3e0b-4b1b-afca-889c63e5b650@r8g2000prd.googlegroups.com>
Hello all
I am trying to write a python script which can mount a pen drive and
read the data from pen drive. I am using pyudev [
http://packages.python.org/pyudev/api/index.html ] and wrote a small
python code

import pyudev, sys
if __name__ =="__main__":
        context = pyudev.Context()
        devices = context.list_devices(subsystem        ="usb")
        for device in devices :
                print device

which prints

Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')

My problem is,  how to know  out of these usb which one to read . The
other solution I got is whenever I insert the pen drive , my system
mounts  it in /media  directory so I can read the /media directory  to
check if its empty or not but this does not seems promising to me
because it may be possible that my system is not able to mount the pen
drive so I have to manually do it .  Kindly some one please tell me
how to solve this problem.

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#12705

Frommukesh tiwari <mukeshtiwari.iiitm@gmail.com>
Date2011-09-03 09:21 -0700
Message-ID<4ee9b05c-b1cf-4542-a3af-6a42b669c37f@a10g2000prn.googlegroups.com>
In reply to#12702
On Sep 3, 7:40 pm, mukesh tiwari <mukeshtiwari.ii...@gmail.com> wrote:
> Hello all
> I am trying to write a python script which can mount a pen drive and
> read the data from pen drive. I am using pyudev [http://packages.python.org/pyudev/api/index.html] and wrote a small
> python code
>
> import pyudev, sys
> if __name__ =="__main__":
>         context = pyudev.Context()
>         devices = context.list_devices(subsystem        ="usb")
>         for device in devices :
>                 print device
>
> which prints
>
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')
>
> My problem is,  how to know  out of these usb which one to read . The
> other solution I got is whenever I insert the pen drive , my system
> mounts  it in /media  directory so I can read the /media directory  to
> check if its empty or not but this does not seems promising to me
> because it may be possible that my system is not able to mount the pen
> drive so I have to manually do it .  Kindly some one please tell me
> how to solve this problem.

I got this link and its working fine [ http://packages.python.org/pyudev/api/monitor.html
]
>>> context = pyudev.Context()
>>> monitor = pyudev.Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> for action, device in monitor:
...     print('{0}: {1}'.format(action, device))

but when I am trying to execute code [ http://packages.python.org/pyudev/api/toolkit.html
]

import pyudev, sys

context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem='usb')
observer = QUDevMonitorObserver(monitor)
def device_connected(device):
     print('{0!r} added'.format(device))
observer.deviceAdded.connect(device_connected)
monitor.start()

I am getting
Traceback (most recent call last):
  File "Mount.py", line 7, in <module>
    observer = QUDevMonitorObserver(monitor)
NameError: name 'QUDevMonitorObserver' is not defined

Could any one please tell me how to avoid this error .
Thank you

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#12710

FromMRAB <python@mrabarnett.plus.com>
Date2011-09-03 18:16 +0100
Message-ID<mailman.739.1315070162.27778.python-list@python.org>
In reply to#12705
On 03/09/2011 17:21, mukesh tiwari wrote:
> On Sep 3, 7:40 pm, mukesh tiwari<mukeshtiwari.ii...@gmail.com>  wrote:
>> Hello all
>> I am trying to write a python script which can mount a pen drive and
>> read the data from pen drive. I am using pyudev [http://packages.python.org/pyudev/api/index.html] and wrote a small
>> python code
>>
>> import pyudev, sys
>> if __name__ =="__main__":
>>          context = pyudev.Context()
>>          devices = context.list_devices(subsystem        ="usb")
>>          for device in devices :
>>                  print device
>>
>> which prints
>>
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.1/usb4/4-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1')
>> Device(u'/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.2/usb8/8-0:1.0')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2')
>> Device(u'/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-0:1.0')
>>
>> My problem is,  how to know  out of these usb which one to read . The
>> other solution I got is whenever I insert the pen drive , my system
>> mounts  it in /media  directory so I can read the /media directory  to
>> check if its empty or not but this does not seems promising to me
>> because it may be possible that my system is not able to mount the pen
>> drive so I have to manually do it .  Kindly some one please tell me
>> how to solve this problem.
>
> I got this link and its working fine [ http://packages.python.org/pyudev/api/monitor.html
> ]
>>>> context = pyudev.Context()
>>>> monitor = pyudev.Monitor.from_netlink(context)
>>>> monitor.filter_by(subsystem='input')
>>>> for action, device in monitor:
> ...     print('{0}: {1}'.format(action, device))
>
> but when I am trying to execute code [ http://packages.python.org/pyudev/api/toolkit.html
> ]
>
> import pyudev, sys
>
> context = pyudev.Context()
> monitor = pyudev.Monitor.from_netlink(context)
> monitor.filter_by(subsystem='usb')
> observer = QUDevMonitorObserver(monitor)
> def device_connected(device):
>       print('{0!r} added'.format(device))
> observer.deviceAdded.connect(device_connected)
> monitor.start()
>
> I am getting
> Traceback (most recent call last):
>    File "Mount.py", line 7, in<module>
>      observer = QUDevMonitorObserver(monitor)
> NameError: name 'QUDevMonitorObserver' is not defined
>
> Could any one please tell me how to avoid this error .
> Thank you

I think you need to import it from pyudev.pyqt4.

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