Re: [Tutor] Printing in the same place
On 17/08/11 23:20, brandon w wrote: I guess I will have to find another way to create a digital clock in a tkinter window. The point about a GUI is that you display widgets that have text on them. It could be a Label, or a Button or a Text box or even a Canvas. Then to change the text you simply replace the text en-masse with a new string, you don't attempt to backspace or return or anything like you would with print(). (Actually with a Text box widget you could do that by controlling the cursor, but for your purpose that is just making it harder than it needs to be!) You just assign a new string to the widgets text attribute. You can see how to do that with one of the examples on my GUI tutor. It replaces the text on a label with the contents of an entry box: # create the event handler to clear the text def evClear(): lHistory['text'] = eHello.get() eHello.delete(0,END) the label(lHistory) simply displays whatever is assigned to its text attribute, and in this case its whatever is in the Entry widget (eHello) before we clear it. It could just as well be a string displaying the current time... HTH, -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Printing in the same place
On 08/17/2011 04:02 AM, Alan Gauld wrote:
On 17/08/11 04:05, brandon w wrote:
I am trying to print in the same place to make a clock in a tkinter
window. I will loop the following code to update the time.
This is not a tkinter program so its completely irrelevant to your
stated aim. In tkinter how print works is of no importance. You will
not be using print in a tkinter program you will simply be changing
the text in a widget.
This seems to work but it is not printing in the same place:
#!/usr/bin/python
#Python 2.6.6
import time
for t in range(5):
digits = time.strftime('%H:%M:%S')
print "\r", digits
time.sleep(0.1)
That's because you are using \r which is platform dependant
(and even terminal dependant on *nix) . You don't say which
platform you are using. Using \b (backspace) may be more
successful.
>>> print ("test","\b\b\b\b\b\b","Foo")
Foo
But, as I say, that won't be very useful in tkinter since you
won't be using print().
I am using Linux with Python 2.6.6.
"\b" seems like a good simple solution to the problem.
I guess I will have to find another way to create a digital clock in a
tkinter window.
I found someone who made a Python clock but I want to create my own version
without just coping his. I will learn more if I try to do it myself.
Thanks for your help.
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Re: [Tutor] Using Python to send signals to the USB port
> Well, my application requires roughly 20 MHz ( :O ... I know )... > However, the DACs are not a problem, I can afford them. OK, Well to digitize a 20M signal you need to sample it at 40M rate. Then just send the digital levels out through the usb port one bit at a time which will require around 8x40M = 320Mbps (plus protocol overheads). That's about the limit of USB2 (maybe even over the limit?). Looks like you will need to use USB3 or resort to compression. And i'm assuming you only want 256 quantization levels, if you want to go to 16bit encoding then you need to double the bitrate. Definitely too high for USB2... If you use compression you need to find a DAC that can unscramble a compressed signal. There are a number of encoding schemes that you could use. You can also save bandwidth by using a bitstream encoding provided the signal slew rate is not too high. Lots of choices but it all depends heavily on the nature of the signal. Its not a simple task, and although the mechanics of sending the data through the usb port are not too hard the algorithms and protocols to generate the data are all documented and not too hard to code up, the plethora of choice is what makes it hard. I'm also assuming that you can process this data in batch mode rather than in real-time and then transmit the digital signal in one go. If it all needs to be real time you might be pushed to use standard Python and need to look at things like Cython or writing a C module. I suspect you need to do a bit of digging on Wikipedia to get a feel for which algorithms/mechanisms are best suited to your needs. Then find a DAC that matches that and use the spec for the DAC to guide your coding. HTH, Alan G.___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Using Python to send signals to the USB port
On 17/08/11 14:28, Jaidev Deshpande wrote: Hi > Is there some way I can use Python to send data through a USB port and > control the data in real-time? Yes, but its not what I'd call easy! > How can I send the digitized form of this array through a USB port, > and then convert it back intoanalog so I can view it on an oscilloscope? The sending to USB is fairly straightforward but to convert that back to analog once its left the PC you will need some kind of DAC (digital to analog convertor), you cannot do that from inside the PC! DACs are relatively easy to find but not that cheap. But if the frequency is not too high you an probably do it inside the PC and send the analog out using the loudspeaker or line-out jack. Then connect that directly to the 'scope. That should work for frequencies up to 20kHz or so, even 40Khz if you have a good sound card!... hth -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Message: pygobject_register_sinkfunc is deprecated (GtkWindow)
Hello Timo!!
Thank you so much for your help! I'll do it
2011/8/17 Timo
> On 16-08-11 20:46, Susana Iraiis Delgado Rodriguez wrote:
>
>> Hello List!
>>
>> I just started to use PyGTK and Glade to create graphical interfaces, my
>> python interpreter version is 2.6.6; I also install the GTK2 Runtime
>> enviroment and Glade 3.6.6. I also installed in my computer
>> pycairo-1.8.10.win32-py2.6.**exe, pygobject-2.26.0-1.win32-py2.**6.exe
>> and pygtk-2.16.0+glade.win32-py2.**6.exe so my graphic application will
>> look and work fine.
>>
>> I tried to do an example in order to get familiar with this new tool, but
>> when I run the script I got the next message:
>> Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit
>> (Intel)] on
>> win32
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> import glade1
>> ** Message: pygobject_register_sinkfunc is deprecated (GtkWindow)
>> ** Message: pygobject_register_sinkfunc is deprecated (GtkInvisible)
>> ** Message: pygobject_register_sinkfunc is deprecated (GtkObject)
>> >>>
>> My code is:
>> import pygtk
>> pygtk.require("2.0")
>> import gtk
>> import gtk.glade
>>
> gtk.glade is deprecated, you should use the builtin gtk.builder instead
> (Google for examples). You should also get the latest GTK/PyGTK versions
> from the PyGTK website. There is a really nice all-in-one installer!
>
> Cheers,
> Timo
>
>
>> class MainWin:
>>def __init__(self):
>>self.widgets = gtk.glade.XML("ejemplo_glade.**glade")
>>signals = { "on_entry1_activate" : self.on_button1_clicked,
>>"on_button1_clicked" : self.on_button1_clicked,
>>"gtk_main_quit" : gtk.main_quit }
>>self.widgets.signal_**autoconnect(signals)
>>self.label1 = self.widgets.get_widget("**label1")
>>self.entry1 = self.widgets.get_widget("**entry1")
>>def on_button1_clicked(self, widget):
>>texto = self.entry1.get_text()
>>self.label1.set_text("Hola %s" % texto)
>>
>>
>> if __name__ == "__main__":
>>MainWin()
>>gtk.main()
>>
>> Does my python libraries are the correct ones for my interpreter?
>>
>>
>> __**_
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>>
>
> __**_
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Re: [Tutor] Using Python to send signals to the USB port
On 2011/08/17 03:28 PM, Jaidev Deshpande wrote: Hi Is there some way I can use Python to send data through a USB port and control the data in real-time? (For instance, I can make a sinusoidal wave of a given specification, and visualize it using NumPy / Matplotlib. How can I send the digitized form of this array through a USB port, and then convert it back into analog so I can view it on an oscilloscope?) Thanks. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Possibly look at the PyUSB module [1] and a tutorial on it [2]. Hopefully that helps and is enough for you. [1] http://sourceforge.net/apps/trac/pyusb/ [2] http://pyusb.sourceforge.net/docs/1.0/tutorial.html -- Christian Witts Python Developer // ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Using Python to send signals to the USB port
Hi Is there some way I can use Python to send data through a USB port and control the data in real-time? (For instance, I can make a sinusoidal wave of a given specification, and visualize it using NumPy / Matplotlib. How can I send the digitized form of this array through a USB port, and then convert it back into analog so I can view it on an oscilloscope?) Thanks. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Printing in the same place
On 17/08/11 09:02, Alan Gauld wrote:
On 17/08/11 04:05, brandon w wrote:
> I am trying to print in the same place to make a clock in a tkinter
> window. I will loop the following code to update the time.
This is not a tkinter program so its completely irrelevant to your
stated aim. In tkinter how print works is of no importance. You will
not be using print in a tkinter program you will simply be changing
the text in a widget.
> This seems to work but it is not printing in the same place:
>
> #!/usr/bin/python
> #Python 2.6.6
>
> import time
>
> for t in range(5):
> digits = time.strftime('%H:%M:%S')
> print "\r", digits
> time.sleep(0.1)
That's because you are using \r which is platform dependant
(and even terminal dependant on *nix) . You don't say which
platform you are using. Using \b (backspace) may be more
successful.
>>> print ("test","\b\b\b\b\b\b","Foo")
Foo
But, as I say, that won't be very useful in tkinter since you
won't be using print().
Oops, you also need to suppress the newline as Peter Otten mentioned!
You can do that in Python v2 by adding a training comma or in v3 you can
specify no newline as a parameter.
But again, all irrelevent for tkinter.
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] Message: pygobject_register_sinkfunc is deprecated (GtkWindow)
On 16-08-11 20:46, Susana Iraiis Delgado Rodriguez wrote:
Hello List!
I just started to use PyGTK and Glade to create graphical interfaces,
my python interpreter version is 2.6.6; I also install the GTK2
Runtime enviroment and Glade 3.6.6. I also installed in my computer
pycairo-1.8.10.win32-py2.6.exe, pygobject-2.26.0-1.win32-py2.6.exe and
pygtk-2.16.0+glade.win32-py2.6.exe so my graphic application will look
and work fine.
I tried to do an example in order to get familiar with this new tool,
but when I run the script I got the next message:
Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit
(Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import glade1
** Message: pygobject_register_sinkfunc is deprecated (GtkWindow)
** Message: pygobject_register_sinkfunc is deprecated (GtkInvisible)
** Message: pygobject_register_sinkfunc is deprecated (GtkObject)
>>>
My code is:
import pygtk
pygtk.require("2.0")
import gtk
import gtk.glade
gtk.glade is deprecated, you should use the builtin gtk.builder instead
(Google for examples). You should also get the latest GTK/PyGTK versions
from the PyGTK website. There is a really nice all-in-one installer!
Cheers,
Timo
class MainWin:
def __init__(self):
self.widgets = gtk.glade.XML("ejemplo_glade.glade")
signals = { "on_entry1_activate" : self.on_button1_clicked,
"on_button1_clicked" : self.on_button1_clicked,
"gtk_main_quit" : gtk.main_quit }
self.widgets.signal_autoconnect(signals)
self.label1 = self.widgets.get_widget("label1")
self.entry1 = self.widgets.get_widget("entry1")
def on_button1_clicked(self, widget):
texto = self.entry1.get_text()
self.label1.set_text("Hola %s" % texto)
if __name__ == "__main__":
MainWin()
gtk.main()
Does my python libraries are the correct ones for my interpreter?
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Re: [Tutor] Printing in the same place
On 17/08/11 04:05, brandon w wrote:
I am trying to print in the same place to make a clock in a tkinter
window. I will loop the following code to update the time.
This is not a tkinter program so its completely irrelevant to your
stated aim. In tkinter how print works is of no importance. You will
not be using print in a tkinter program you will simply be changing
the text in a widget.
This seems to work but it is not printing in the same place:
#!/usr/bin/python
#Python 2.6.6
import time
for t in range(5):
digits = time.strftime('%H:%M:%S')
print "\r", digits
time.sleep(0.1)
That's because you are using \r which is platform dependant
(and even terminal dependant on *nix) . You don't say which
platform you are using. Using \b (backspace) may be more
successful.
>>> print ("test","\b\b\b\b\b\b","Foo")
Foo
But, as I say, that won't be very useful in tkinter since you
won't be using print().
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] Printing in the same place
brandon w wrote:
> I am trying to print in the same place to make a clock in a tkinter
> window. I will loop the following code to update the time.
>
> This seems to work but it is not printing in the same place:
>
> #!/usr/bin/python
> #Python 2.6.6
>
> import time
>
> for t in range(5):
> digits = time.strftime('%H:%M:%S')
> print "\r", digits
> time.sleep(0.1)
The print statement automatically adds a newline. Try
sys.stdout.write("\r" + digits)
sys.stdout.flush()
instead of print.
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Re: [Tutor] directory within directory
questions anon wrote: > Thank you, that does create the directories in the new place but when I > process the data it does not put the outputs in the correct directory they > all end up in the last directory created. > Below is the code of what I am trying to do. > Any feedback will be greatly appreciated. I think > for (path, dirs, files) in os.walk(inputpath): > for dir in dirs: > print dir > sourcepath=os.path.join(path,dir) > relativepath=os.path.relpath(sourcepath,inputpath) > newdir=os.path.join(outputpath,relativepath) the following two lines > if not os.path.exists(newdir): > os.makedirs(newdir) belong in the for-dirs-loop. plt.savefig() belongs into the for-ncfile loop and needs a path based on the path variable: > > for ncfile in files: > if ncfile[-3:]=='.nc': ... relativepath = os.path.relpath(path, inputpath) newdir = os.path.join(outputpath, relativepath) plt.savefig((os.path.join(newdir,'TSFC'+date_string+'UTC.png'))) All untested guesswork. I don't see how you ensure that you get a new figure for each *.nc file and am too lazy to consult the matplotlib documentation... ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
