Re: [Tutor] Misunderstanding the Entry Widget
Wayne Watson sierra_mtnv...@sbcglobal.net wrote Can you easily construct a simple example where they are absolutely necessary, or at least provide a situation where they are necessary? I don't think you can. They are a convenience feature not a necessity. But the same can be said of standard dialogs, message boxes etc. You could build all of those from basic widgets but it woulfd be a pain. Sometimes Control variables save you some pain. Personally I don't bother with them much but others like them. Alan G ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] print problem python
mustafa akkoc mustafa.c...@gmail.com wrote i start learning pyton language i want to print some thing but when i type : print hello world but it give an error like this SyntaxError: invalid syntax (pyshell#18, line 1) i am using python shell version 3.0.1 If you are new to programming as well as Pyton I recommend you get Python 2.6 rather than Python 3. Python 3 has a lot of changes and most of the beginners material hasn't caught up yet. It will be easier to get answers to your questions if you stick with v2.6 and then when comfortable with that move to v3 aand learn about the differences. Sometimes newest isn't the best. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] glob in order of the file numbers
On Fri, Mar 6, 2009 at 11:34 PM, Kent Johnson ken...@tds.net wrote: On Fri, Mar 6, 2009 at 9:52 PM, Emad Nawfal (عماد نوفل) emadnaw...@gmail.com wrote: Hi Tutors, suppose I have four files in the current directory: 1.temp, 2.temp, 3.temp, and 4.temp. I want to use glob, or anything else, to print the contents of the files in their respective orders, where the content of 1.temp gets printed, then 2.temp, then 3.temp, then 4.temp. I write the following, but it does not get me what I want: import glob for path in glob.iglob(*.temp): infile = open(path) for line in infile: print line.strip() Since you know the file names, just build the names directly: for i in range(1, 5): path = '%s.temp' % i print open(path).read() Kent Thank you all for the solutions. I had figured out Kent's solution before, so thank you for letting me know that I did it right. So, glob just creates a list of the file names. Thank you all again. -- لا أعرف مظلوما تواطأ الناس علي هضمه ولا زهدوا في إنصافه كالحقيقة.محمد الغزالي No victim has ever been more repressed and alienated than the truth Emad Soliman Nawfal Indiana University, Bloomington http://emnawfal.googlepages.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] print problem python
On Sat, Mar 7, 2009 at 3:11 AM, Alan Gauld alan.ga...@btinternet.com wrote: snip Python 3 has a lot of changes and most of the beginners material hasn't caught up yet. It will be easier to get answers to your questions if you stick with v2.6 and then when comfortable with that move to v3 aand learn about the differences. As far as I know, Snake Wrangling For Kids has been updated... that's the only one I know about. -Wayne -- To be considered stupid and to be told so is more painful than being called gluttonous, mendacious, violent, lascivious, lazy, cowardly: every weakness, every vice, has found its defenders, its rhetoric, its ennoblement and exaltation, but stupidity hasn’t. - Primo Levi ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] print problem python
On Sat, Mar 7, 2009 at 7:51 AM, W W sri...@gmail.com wrote: On Sat, Mar 7, 2009 at 3:11 AM, Alan Gauld alan.ga...@btinternet.com wrote: snip Python 3 has a lot of changes and most of the beginners material hasn't caught up yet. It will be easier to get answers to your questions if you stick with v2.6 and then when comfortable with that move to v3 aand learn about the differences. As far as I know, Snake Wrangling For Kids has been updated... that's the only one I know about. I didn't know about that one! There is a list of Python 3.0 learning resources here: http://wiki.python.org/moin/Python3.0Tutorials Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Pyusb: get data via USB sent from mouse
Hi folks, I'm new on pyusb programming and to learn how to get data i'm trying to get data sent from my mouse. I've download a program called usbview( http://www.kroah.com/linux/usb/ ) to display the device descriptors of any USB device pluged to my computer. I made a peace of code that was supposed to get the data sent from my mouse but when i try to run it there is an error saying that the device is busy =S Code: === import sys import usb import time import struct import array import math class DeviceDescriptor(object) : def __init__(self, vendor_id, product_id, interface_id) : self.vendor_id = vendor_id self.product_id = product_id self.interface_id = interface_id def getDevice(self) : busses = usb.busses() for bus in busses: for device in bus.devices : if device.idVendor == self.vendor_id : if device.idProduct == self.product_id : return device return None class PlugUSBDevice(object) : PLUG_VENDOR_ID = 0x1c4f # mouse vendor id PLUG_PRODUCT_ID = 0x0003# mouse product id PLUG_INTERFACE_ID = 0# mouse interface number PLUG_INTERRUPT_IN_EP = 0x81L# mouse end point address def __init__(self) : self.device_descriptor = DeviceDescriptor(PlugUSBDevice.PLUG_VENDOR_ID, PlugUSBDevice.PLUG_PRODUCT_ID, PlugUSBDevice.PLUG_INTERFACE_ID) self.device = self.device_descriptor.getDevice() self.handle = None def open(self) : self.device = self.device_descriptor.getDevice() self.handle = self.device.open() self.handle.claimInterface(self.device_descriptor.interface_id) def close(self) : self.handle.releaseInterface() def getDataPacket(self, bytesToGet) : return self.handle.interruptRead(PlugUSBDevice.PLUG_INTERRUPT_IN_EP, bytesToGet, 15) if __name__ == __main__: device = PlugUSBDevice() device.open() print device.getDataPacket(4) The error: File readusb.py, line 61, in module device.open() File readusb.py, line 50, in open self.handle.claimInterface(self.device_descriptor.interface_id) usb.USBError: could not claim interface 0: Device or resource busy == What am i doing wrong? =S ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] could someone explain why this happens to me.
When I enter the following code into IDLE do both lists have the same value? How would I manipulate both lists separately? List1=[1,2,3] List2=List1 List2.reverse() print(List2) [3, 2, 1] print(List1) [3, 2, 1] List2.append(0) print(List2) [3, 2, 1, 0] print(List1) [3, 2, 1, 0] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] could someone explain why this happens to me.
On Sat, Mar 7, 2009 at 2:09 PM, sphennings W. sphenni...@gmail.com wrote: When I enter the following code into IDLE do both lists have the same value? How would I manipulate both lists separately? List1=[1,2,3] List2=List1 List2.reverse() print(List2) [3, 2, 1] print(List1) [3, 2, 1] List2.append(0) print(List2) [3, 2, 1, 0] print(List1) [3, 2, 1, 0] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor When you assign list2 to list1, you are just referencing the old list. Whatever you do either one, it will affect the other as well. The solution, to my limited knowledge, is to deep-copy the list, as illustrated here: l1 = [1,2,3] import copy l2 = copy.deepcopy(l1) l2 [1, 2, 3] l1.reverse() l1 [3, 2, 1] l2 [1, 2, 3] -- لا أعرف مظلوما تواطأ الناس علي هضمه ولا زهدوا في إنصافه كالحقيقة.محمد الغزالي No victim has ever been more repressed and alienated than the truth Emad Soliman Nawfal Indiana University, Bloomington http://emnawfal.googlepages.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] could someone explain why this happens to me.
On Sun, Mar 8, 2009 at 12:39 AM, sphennings W. sphenni...@gmail.com wrote: When I enter the following code into IDLE do both lists have the same value? How would I manipulate both lists separately? List1=[1,2,3] List2=List1 List2.reverse() print(List2) [3, 2, 1] print(List1) [3, 2, 1] List2.append(0) print(List2) [3, 2, 1, 0] print(List1) [3, 2, 1, 0] When you create an object and assign it to a variable, the variable only refers to the object and does not represent the object itself. If you want to make a copy of a list or such kinds of sequences , then you have to use the slicing operation to make a copy. If you just assign the variable name to another name, both of them will refer to the same object. List2=List1[ : ] Kapil Dua Mobile: +919711311052 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] could someone explain why this happens to me.
On Sat, Mar 7, 2009 at 2:36 PM, Kapsicum duaka...@gmail.com wrote: On Sun, Mar 8, 2009 at 12:39 AM, sphennings W. sphenni...@gmail.comwrote: When I enter the following code into IDLE do both lists have the same value? How would I manipulate both lists separately? List1=[1,2,3] List2=List1 List2.reverse() print(List2) [3, 2, 1] print(List1) [3, 2, 1] List2.append(0) print(List2) [3, 2, 1, 0] print(List1) [3, 2, 1, 0] When you create an object and assign it to a variable, the variable only refers to the object and does not represent the object itself. If you want to make a copy of a list or such kinds of sequences , then you have to use the slicing operation to make a copy. If you just assign the variable name to another name, both of them will refer to the same object. List2=List1[ : ] Kapil Dua Mobile: +919711311052 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor This made me search, and I found another solution: if you use the list function as follows: s = [1,2,3] v = list(s) s.reverse() s [3, 2, 1] v [1, 2, 3] As a linguist, I would love to know what the difference between these things are: mycopy = original[:] mycopy = copy.deepcopy(original) mycopy = list(original) -- لا أعرف مظلوما تواطأ الناس علي هضمه ولا زهدوا في إنصافه كالحقيقة.محمد الغزالي No victim has ever been more repressed and alienated than the truth Emad Soliman Nawfal Indiana University, Bloomington http://emnawfal.googlepages.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] could someone explain why this happens to me.
Emad Nawfal (عماد نوفل) emadnaw...@gmail.com wrote As a linguist, I would love to know what the difference between these things are: The differences are the same whether you are a linguist or not :-) (and yes I know my reading is incorrect grammaticallly but I couldn't resist it!) mycopy = original[:] Returns a slice of the original list. In this case it so happens the slice is the full list. mycopy = copy.deepcopy(original) calls the deepcopy function which traverses the original list and all nested structures explicitly copying the elements. mycopy = list(original) Use the list type constructor to make a list out of its argument. It just so happens the argument in this case is a list. The end result is the same but the mechanisms (ie the code called) are quite different. It would be interesting to compare speeds, but I'm too lazy! I suspect deepcopy would be slowest but I'm not sure about the other two. Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] could someone explain why this happens to me.
2009/3/7 Alan Gauld alan.ga...@btinternet.com Emad Nawfal (عماد نوفل) emadnaw...@gmail.com wrote As a linguist, I would love to know what the difference between these things are: The differences are the same whether you are a linguist or not :-) (and yes I know my reading is incorrect grammaticallly but I couldn't resist it!) mycopy = original[:] Returns a slice of the original list. In this case it so happens the slice is the full list. mycopy = copy.deepcopy(original) calls the deepcopy function which traverses the original list and all nested structures explicitly copying the elements. mycopy = list(original) Use the list type constructor to make a list out of its argument. It just so happens the argument in this case is a list. The end result is the same but the mechanisms (ie the code called) are quite different. It would be interesting to compare speeds, but I'm too lazy! I suspect deepcopy would be slowest but I'm not sure about the other two. Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor Thanks Alan, As a linguist, I appreciate your disambiiguation mechanism. Not all subscribers to this list are programmers, or know much about computer science. I know lots about formal thinking, but not about programming, and I always preface my questions with an expression that means: please give me a simple answer without so much jargon. Thanks for the explanation -- لا أعرف مظلوما تواطأ الناس علي هضمه ولا زهدوا في إنصافه كالحقيقة.محمد الغزالي No victim has ever been more repressed and alienated than the truth Emad Soliman Nawfal Indiana University, Bloomington http://emnawfal.googlepages.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] could someone explain why this happens to me.
2009/3/7 Alan Gauld alan.ga...@btinternet.com:
mycopy = original[:]
Returns a slice of the original list. In this case it so happens
the slice is the full list.
mycopy = list(original)
Use the list type constructor to make a list out of its argument.
It just so happens the argument in this case is a list.
Both not give the desired result with nested lists and this is why you have..
mycopy = copy.deepcopy(original)
calls the deepcopy function which traverses the original list
and all nested structures explicitly copying the elements.
copy.deepcopy :-)
import copy
list1 = [1,2]
list2 = [3.4]
list3 = [list1, list2]
list4 = list(list3)
list5 = list3[:]
list6 = copy.deepcopy(list3)
list1.append('a')
list1
[1, 2, 'a']
list3
[[1, 2, 'a'], [3.3999]]
list4
[[1, 2, 'a'], [3.3999]]
list5
[[1, 2, 'a'], [3.3999]]
list6
[[1, 2], [3.3999]]
Notice that list6 is the only list which does not have the appended a.
Greets
Sander
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Re: [Tutor] Misunderstanding the Entry Widget
Title: Signature.html I have no idea of the history of these variables, but they have very limited descriptions and examples. Maybe someone like Grayson goes into detail on them. Looking at the program I'm concerned about, it almost looks like the use is a learned response to dealing with the widgets used. That's OK. I just wanted to make sure I wasn't overlooking something. It provided a helpful interlude. :-) Alan Gauld wrote: "Wayne Watson" sierra_mtnv...@sbcglobal.net wrote Can you easily construct a simple example where they are absolutely necessary, or at least provide a situation where they are necessary? I don't think you can. They are a convenience feature not a necessity. But the same can be said of standard dialogs, message boxes etc. You could build all of those from basic widgets but it woulfd be a pain. Sometimes Control variables save you some pain. Personally I don't bother with them much but others like them. Alan G ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.01 Deg. W, 39.26 Deg. N) GMT-8 hr std. time) In mathematics you don't understand things. You just get used to them. -- John Von Neumann (P.S. The same is true in life.) Web Page: www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Misunderstanding the Entry Widget
Title: Signature.html Another thought occurred to me about this situation. Suppose I have a dialog with two Entry objects in a dialog object called TwoEntries: entry1 = Entry(master, width=10).grid(row=4, column=1) entry2 = Entry(master, width=10).grid(row=5, column=1) and I do not use a StringVar to return the values entered. Is it possible to reach inside TwoEntries, after returning from it, and grab entry1 and 2? It would seem so if the call was dialog=TwoEntries(...). Wayne Watson wrote: I have no idea of the history of these variables, but they have very limited descriptions and examples. Maybe someone like Grayson goes into detail on them. Looking at the program I'm concerned about, it almost looks like the use is a learned response to dealing with the widgets used. That's OK. I just wanted to make sure I wasn't overlooking something. It provided a helpful interlude. :-) Alan Gauld wrote: "Wayne Watson" sierra_mtnv...@sbcglobal.net wrote Can you easily construct a simple example where they are absolutely necessary, or at least provide a situation where they are necessary? I don't think you can. They are a convenience feature not a necessity. But the same can be said of standard dialogs, message boxes etc. You could build all of those from basic widgets but it woulfd be a pain. Sometimes Control variables save you some pain. Personally I don't bother with them much but others like them. Alan G ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.01 Deg. W, 39.26 Deg. N) GMT-8 hr std. time) In mathematics you don't understand things. You just get used to them. -- John Von Neumann (P.S. The same is true in life.) Web Page: www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Signature.html Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.01 Deg. W, 39.26 Deg. N) GMT-8 hr std. time) In mathematics you don't understand things. You just get used to them. -- John Von Neumann (P.S. The same is true in life.) Web Page: www.speckledwithstars.net/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
