[Tutor] Removing certain sequences from a string list elements
Hello,
I have a simple python program where I am comparing two log files and I am
storing the differences in a list. I am programming in python after a long
time so may be I might have not written something very efficient. Please
let me know what alternate solution I can apply for my program.
I am reading each line in the file individually and storing them in a list.
After that i am comparing the two lists and printing out the differences.
But I wanted to know how can I iter through each string in the list and
remove certain sequences like \n and ',' comma. I want to basically
printout a column where it has each element of the list in each row.
It should also avoid priting the time stamp since they will be different
anyway. i want the program as simple as it looks right now.
Input file contains something like this in each line. I have not included
the complete log file.
*MegaMon mfc*
*MFC data:*
*vendorId/deviceId=1000/005b, subVendorId/subDeviceId=1000/9285, OEM=1,
SubOem=1, isRaidKeySecondary=0*
*MFCF: disableSAS=0, maxDisks=0, enableRaid6=1, disableWideCache=0*
*disableRaid5=0, enableSecurity=0, enableReducedFeatureSet=0*
*enableCTIO=0 enableSnapshot=1 enableSSC=1 enableCacheOffload=0*
*maxHANodes=2*
here is the program
def readList1():
f1 = open('mfc_node1.txt',r)
lines = f1.read().split( )
q = []
for line in lines:
if not line in q:
q.append(line)
f1.close()
return q
def readList2():
f = open('mfc_node2.txt',r)
lines = f.read().split( )
p = []
for line in lines:
if not line in p:
p.append(line)
f.close()
return p
if __name__ == __main__:
q = readList1()
#print q
p = readList2()
#print p
newList = []
for x in q:
if x not in p:
newList.append(x)
Here is the part of the output list
['enableCTIO=0,', 'enableSnapshot=1,', 'enableSSC=1,', 'maxHANodes=0\n',
'sasAddr=5123456712345678\nSecondary', 'enableSnapshot=0,', 'enableSSC=0,',
'sasAddr=\nMegaMon', '13:53:14:']
-Varsha
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[Tutor] [tutor] PyGame tutorials
Hello all, I have learnt python and wxPython. Now i want to learn making games using pygame engine. Can anyone tellme from where i can learn pygame and start making basic games using this module. Which version i should download and is there any user group like this one for pyGame ?? thanks, -- Varsha Purohit ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] Finding image statistics
Yeahh so by doing this i am counting only the difference part since we have grayscaled the image and assuming it will count only the pixels that evolve as difference if i use sum2 instead of sum i think it will give squared sum which is area... and if i just use count it would count the number of pixels developed like that... sounds interesting .. thanks for throwing light for me in right direction On Sun, Mar 2, 2008 at 4:45 PM, Kent Johnson [EMAIL PROTECTED] wrote: Varsha Purohit wrote: I am getting this list as an output [268541.0, 264014.0, 324155.0] This is the sum of the values of the red pixels, etc. They are not counts, but sums. So if you have an image with the two pixels (1, 2, 3), (4, 5, 6) you would get a sum of (5, 7, 9). Actually in my code i am finding difference between two images and i need to count the number of pixels which appear as a difference of these two images. These values i m getting as output are little large. So you want a count of the number of pixels that differ between the two images? Maybe this: diff = ImageChops.difference(file1, file2) # Convert to grayscale so differences are counted just once per pixel diff = ImageOps.grayscale(diff) # Convert each difference to 0 or 1 so we can count them # Clipping function def clip(x): return 1 if x = 1 else 0 # Apply the clipping function diff = Image.eval(diff, clip) print ImageStat.Stat(diff).sum Kent i m pasting my code again file1=Image.open(./pics/original.jpg) file2=Image.open(val) diff = ImageChops.subtract(file1,file2,0.3) stat1 = ImageStat.Stat(diff) count1=stat1.sum print count1 diff.save(./pics/diff+.jpg) diff.show() AS you can see i am finding difference of two images which are nearly identical. But they have some pixels that are different and i can see that in the output image diff.jpg. So i am trying to put this difference image in the imagestat and trying to see if i can get to count the number of pixels ... -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] Finding image statistics
Yes i am getting this but i was confused why i am getting 3 values for
count, extrema.. and dats y i couldn't figure out how to find area of those
pixels..
On Sun, Mar 2, 2008 at 9:02 AM, Kent Johnson [EMAIL PROTECTED] wrote:
Varsha Purohit wrote:
of this module in this application.
I want to find other image statistics such as finding number of pixels
which exist after taking difference between two images, getting sum of
all pixels and area of pixels that are in that image etc.
I don't think you can get all of that out of ImageStat, it is pretty
basic.
In [18]: import Image, ImageStat
In [19]: i=Image.open('kent.jpg')
In [21]: s=ImageStat.Stat(i)
In [23]: s.extrema
Out[23]: [(0, 255), (0, 255), (0, 251)]
In [24]: s.count
Out[24]: [43200, 43200, 43200]
In [25]: s.mean
Out[25]: [116.61453703703704, 103.23967592592592, 97.624606481481479]
etc.
Kent
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Re: [Tutor] [tutor] Finding image statistics
I am getting this list as an output
[268541.0, 264014.0, 324155.0]
Actually in my code i am finding difference between two images and i need to
count the number of pixels which appear as a difference of these two images.
These values i m getting as output are little large.
i m pasting my code again
file1=Image.open(./pics/original.jpg)
file2=Image.open(val)
diff = ImageChops.subtract(file1,file2,0.3)
stat1 = ImageStat.Stat(diff)
count1=stat1.sum
print count1
diff.save(./pics/diff+.jpg)
diff.show()
AS you can see i am finding difference of two images which are nearly
identical. But they have some pixels that are different and i can see that
in the output image diff.jpg. So i am trying to put this difference image in
the imagestat and trying to see if i can get to count the number of pixels
...
thanks,
On Sun, Mar 2, 2008 at 9:48 AM, Varsha Purohit [EMAIL PROTECTED]
wrote:
Yes i am getting this but i was confused why i am getting 3 values for
count, extrema.. and dats y i couldn't figure out how to find area of those
pixels..
On Sun, Mar 2, 2008 at 9:02 AM, Kent Johnson [EMAIL PROTECTED] wrote:
Varsha Purohit wrote:
of this module in this application.
I want to find other image statistics such as finding number of pixels
which exist after taking difference between two images, getting sum of
all pixels and area of pixels that are in that image etc.
I don't think you can get all of that out of ImageStat, it is pretty
basic.
In [18]: import Image, ImageStat
In [19]: i=Image.open('kent.jpg')
In [21]: s=ImageStat.Stat(i)
In [23]: s.extrema
Out[23]: [(0, 255), (0, 255), (0, 251)]
In [24]: s.count
Out[24]: [43200, 43200, 43200]
In [25]: s.mean
Out[25]: [116.61453703703704, 103.23967592592592, 97.624606481481479]
etc.
Kent
--
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Graduate Student
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Graduate Student
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[Tutor] [tutor] creating list of tuples
Hello all, In my application i have to create a list of tuples. I have a for loop which will create (x,y) tuple each time it iterates, and i ahve to store each tuple in a list like list1= [(x1,y1), (x2,y2).] any ideas how to do that ??? thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] creating list of tuples
I think i got it i m creating a tuple of 2 elements everytime and i m adding it to a list. i m creating a new tup everytime and adding it to a list for x in file: value=0 tup = () for developerAgent in developers: #print developerAgent.disutility value +=developerAgent.disutility tup = (value,globalVar.cntr) globalVar.cntr +=1 globalVar.disutilList.append(tup) print globalVar.disutilList i am getting output as what i described... thanks for the help :) On Mon, Feb 25, 2008 at 6:52 PM, Kent Johnson [EMAIL PROTECTED] wrote: Varsha Purohit wrote: Hello all, In my application i have to create a list of tuples. I have a for loop which will create (x,y) tuple each time it iterates, and i ahve to store each tuple in a list like list1= [(x1,y1), (x2,y2).] any ideas how to do that ??? list1 = [] for ... # code to create x and y list1.append( (x, y) ) Note you do need the double parentheses; the inner pair creates a tuple, the outer pair is for the function call. Kent -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Question on multithreading
Hello, i have a gui program in wxpython where i am spawning two threads. one for the mainloop of gui and other for some background tasks. I have to stop the background running thread once its work is done. I am trying to use the join method but it is giving me an error saying threads cannot be joined as the thread has just been created... whereas at that point the thread is done with its job. So i am confused whether i am putting it correctly or not. also, is there any method called stop() to stop the threadsAlso, i want to see if the thread is alive or not.. but i donno where should i put the isAlive() method associated with the thread.. i tried putting it in the code where thread does execution but apparently it is not the correct place. Here is the code... class GuiScript(threading.Thread): def __init__(self): self.run() def run(self): app = wx.PySimpleApp() MainWindow().Show() app.MainLoop() class RunScript(threading.Thread): def run(self): imFile=test() and when the stop button is pressed the two threads should stop executing... so i have written code like this... def OnCloseWindow(self,event): GuiScript().Stop() RunScript().Stop() self.Destroy() but seems stop() method is not existing... can anybody guide me pl thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] PIL versus matlab
Hello All, I wanted to know what are the advantages and disadvantages of using pIL instead of matlab software to deal to image processing. thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Problem in saving image file which is modified by ImageEnhance
Hello All, I am using PIL function to change brightness of an image. But i am getting an error when i am trying to save that image. Here is the code.. import Image import ImageChops, ImageEnhance import math, operator file1 = Image.open(r10001t0.jpg) file2 = Image.open(r10001t1.jpg) diff = ImageChops.difference(file1,file2) enhancer = ImageEnhance.Brightness(diff) ext = .jpg enhancer.save(diff1 + ext, JPEG, quality =100) I am getting error as ImageEnhance doesn't have attribute called save... how should i save the enhanced image... or alternatively when i am comparing two images using imagechops i am getting a black back ground... how should i make it little brighter or use another colour instead of black ??? -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor]Imagechop error
Hello everyone, I am tryin to use the imagechop module but i am not able to implement it successfully. I want to compare two images and give the resultant of the image using difference module. i am tryin to save the resultant image. But i am getting some wierd error. It gives error in the line where i have used imagechop.difference and the error is AttributeError: 'str' object has no attribute 'load'I am unable to understand what is the problem. Can any one help me understand this imagechop module ?? import Image import ImageChops file1 = Nearest.jpg file2 = Bilinear.jpg diff = ImageChops.difference(file1, file2) ext = .jpg diff.save(diff + ext, JPEG, quality =100) -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Scrollbars around the image
Hi All,
I have made a simple panel where i am loading an image from the folder.
I have a button named zoomin. When i press this button a pair of horizontal
and vertical scrollbars should appear on the image panel nearby image. so
that we can see the zoomed image properly. I am trying to use
wx.Scrollbarbut i am not able to fix the scrollbars properly around
the image. I have
not added the scrollbar portion to the button handler in the code below.. i
have just commented out as its not actually working.
import wx
class ComboBox(wx.Dialog):
def __init__(self, parent, id, title):
wx.Dialog.__init__(self, parent, id, title, size=(450, 470))
panel = wx.Panel(self, -1, (75, 20), (100, 127), style=
wx.SUNKEN_BORDER)
self.picture = wx.StaticBitmap(panel)
self.picture.SetBitmap(wx.Bitmap('srk.jpg'))
panel.SetBackgroundColour(wx.WHITE)
wx.Button(self, 1, 'Close', (80, 220))
wx.Button(self, 2, 'Zoomin', (80, 280))
self.Bind(wx.EVT_BUTTON, self.OnClose, id=1)
self.Bind(wx.EVT_BUTTON, self.OnZoom, id=2)
self.Centre()
self.ShowModal()
self.Destroy()
def OnClose(self, event):
self.Close()
def OnZoom(self, event):
##sw = wx.ScrolledWindow(panel)
##sw.SetScrollbars(20, 20, 155, 40)
##sw.Scroll(50,10)
self.Close()
app = wx.App()
ComboBox(None, -1, 'picture box')
app.MainLoop()
But can please anybody suggest me how should i go ahead and solve this
problem ??
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Graduate Student
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[Tutor] [tutor] Question on multithreading
Hello friends, I hve a GUI where i have start button and stop button. When i press start button one thread is created and it is executing some background task and when i press stop button that thread is stopped/killed. These two things are working properly. But i have to implement pause button in my GUI. When i press pause the thread execution should come to a halt and after that it should be resumed when i press pause again or may be i can implement some other button. Does anybody have an example where they have implemented this kind of threading concept ?? any help is apreciated, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Calling python from a c program
Hi,
I just read about how to call python from a c program. This is the
function for that
int main()
{
Py_Initialize();
PyRun_SampleString(print 76);
Py_Finalize();
return 0;
}
But i am getting an error of header file. python.h not found. Can anybody
tell me where can i get this header file ?? And how can i call the python
interpreter screen from c program ??
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Re: [Tutor] [tutor] Calling python from a c program
I got the python.h file but i am getting linking errors for my program
On Jan 20, 2008 1:18 AM, Varsha Purohit [EMAIL PROTECTED] wrote:
Hi,
I just read about how to call python from a c program. This is the
function for that
int main()
{
Py_Initialize();
PyRun_SampleString(print 76);
Py_Finalize();
return 0;
}
But i am getting an error of header file. python.h not found. Can anybody
tell me where can i get this header file ?? And how can i call the python
interpreter screen from c program ??
--
Varsha Purohit,
Graduate Student
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Graduate Student
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Re: [Tutor] [tutor] Calling python from a c program
I am gettng following linking errors [Linker error] undefined reference to `_imp__Py_Initialize' [Linker error] undefined reference to `PyRun_SampleString' [Linker error] undefined reference to `_imp__Py_Finalize' I think i need to set the path to the linker... may be i need to pass linking options of python to the c compiler... but wat are those options :( ?? On Jan 20, 2008 7:16 AM, Alan Gauld [EMAIL PROTECTED] wrote: Varsha Purohit [EMAIL PROTECTED] wrote I just read about how to call python from a c program. Where did you read it? There are several sources of info on embedding Python in C, some better than others. And how can i call the python interpreter screen from c program ?? You don't call the python interpreter screen (ie the prompt) from C you call the interpreter itself. The interactive interpreter is a C program in its own right. You could write your own fairly easily or you could use the PyShell GUI component that is part of the wxPython package. But usually you just want to interpret some Python commands much as you did in your example. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] interview questions
Thanks for the input. ACtualy i just started programming in python since aug 2007 and i m doing my masters research on it. So i learnt python in quite less amount of time. But otherwise i am good in c and c++. I am giving my first interview in python so i dont know what kind of questions they might ask me. So i wanted to have some list of quiestions which would give me an idea as how should i prepare for python and wxpython. On Jan 19, 2008 3:38 AM, Remco Gerlich [EMAIL PROTECTED] wrote: Hi. I've interviewed people for a project in which we used Perl. Most of us already on the team hadn't used Perl before that project, but we learned it pretty quickly, so we knew that that was quite possible. Before the interview we would have seen their CV, and decided we wanted to speak to them, so any language specific questions in the interview (or programming questions generally) would be to check if they really had the level they claimed. Some people said in their letter, I don't know Perl yet but I do know X and Y, I can program, and I expect to be able to learn Perl. That was fine by us, we did ask them things about how they'd do things in X and Y, and general problems of Web programming, how would they go about learning a language - but we didn't grill them on their Perl. Then there were those who claimed they were good at Perl. Even though we weren't specifically looking for great Perl programmers, if they claim to be great... these very often failed at pretty simple stuff, they really were just beginners. Not actually worse at Perl than the other candidates, but they had claimed more. So, be honest :-) Then it doesn't matter much what they ask, since you have the level of Python knowledge that you claimed. Remco Gerlich On Jan 19, 2008 3:09 AM, Varsha Purohit [EMAIL PROTECTED] wrote: Hello All, I have an interview in python program development. Can i know some interview questions in python ? If you know any website where i can refer that would be helpful. thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Pointers in python ??
Hello All, Does python has concept of pointers like c/cpp ?? If yes how.. can anyone give me a small example to how we can use pointers in python. thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] interview questions
Hello All, I have an interview in python program development. Can i know some interview questions in python ? If you know any website where i can refer that would be helpful. thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Interview questions in python and wxpython
Hello All, I have an interview in python program development. Can i know some interview questions in python ? If you know any website where i can refer that would be helpful. thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Comparing two images using PIL
Hello Everyone, I have an application where i am comparing two images(jpg) which are almost identical but have little difference. I wanted to mark the difference with a different colour to highlight the region which is different from 1st image. Can you tell me if there is any image funciton in PIL which will help me to calculate the differences between two different JPEG images. -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Zoom in and zoom out capability
Hello All, In my program i have a gui where i am showing an image on the panel. I want to implement zoom in and zoom out functions using wxpython and PIL. I am tryin to find in PIL if there is any functionality like that. I want the user to select either of the button and when they click on the image panel it shd accordingly zoomin or zoom out. Or may be once user selects an area inside the image where he wants to zoom in and see. Lemme know if anybody came across this kind of implementation. Any help is appreciated. -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] Zoom in and zoom out capability
Hi Alan, Yeah i read about them. i tried using the resize function but i was having difficulty with clarity of the image. I had asked similar thing in another post. I didnt get any satisfying answer for that. Tried imagefilterhttp://www.pythonware.com/library/pil/handbook/imagefilter.htmeven thats not workin out properly. :( Well in my application i need to make a button which when pressed should zoom in the image so i was wondering how can i implement it i mean how should i present the image with more size in a fixed size image panel. Any ideas.. i am even plannin to implement a slider which will zoom in and out the image accordingly.. - Varsha On Jan 9, 2008 12:11 PM, Alan Gauld [EMAIL PROTECTED] wrote: Varsha Purohit [EMAIL PROTECTED] wrote I want to implement zoom in and zoom out functions using wxpython and PIL. I am tryin to find in PIL if there is any functionality like that. A few minutes browsing the PIL documentation leads me to think there are. Try reading about crop and resize and maybe thumbnail. Between them these should just about cover your needs I think. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Pil image related question -- resending message without attachments
Hello All, I am actually working on a project which deals with image processing. I just used pil function to resize the image into the dimensions i want. i was able to resize the image but the clarity of the new image is not good. Can anyone suggest which other functions i should use to improve the clarity. I am attaching the code and sending the images in the attachment. Can anyone suggest me how to do it ? import Image imageFile = srk.jpg #original small image im1 = Image.open(imageFile) width = 680 height = 420 im2 = im1.resize((width,height), Image.NEAREST) im3 = im1.resize ((width,height), Image.BICUBIC) #images get saved in c drive with jpg extensions ext = .jpg im2.save(C:/nearest + ext) im3.save(C:/Bicubic + ext) print files are saved -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [wxPython-users] Dynamically loading images on the panel of GUI
hello everyone, i made a small applicatin where i need to display an image on a panel. and then when i press the read button it should read another image and display it on the same panel. Its working but i have to press the read button two times then only its working import wx import os APP_SIZE_X = 700 APP_SIZE_Y = 300 class MainWindow(wx.Frame): def __init__(self): wx.Frame.__init__(self,None,-1,Agent-Based Model of Residential Development, size = (APP_SIZE_X, APP_SIZE_Y)) self.panel = wx.Panel(self,-1) self.imageFile = r10001t0.asc.jpg # provide a diff file name in same directory/path self.bmp = wx.Image(self.imageFile,wx.BITMAP_TYPE_JPEG ).ConvertToBitmap() wx.StaticBitmap(self.panel, -1, self.bmp, (20,20), (80,120)) button42 = wx.Button(self.panel, -1, Read, pos=(240,20)) self.Bind(wx.EVT_BUTTON, self.OnRead,button42) def OnRead(self,event): self.imageFile1=DSCN3378.jpg # you have to provide a diff image file name self.bmp = wx.Image(self.imageFile1,wx.BITMAP_TYPE_JPEG ).ConvertToBitmap() wx.StaticBitmap(self.panel, -1, self.bmp, (20,20), (80,120)) app = wx.PySimpleApp() MainWindow().Show() app.MainLoop() Load two different jpeg images. -- Varsha ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [wxPython-users] Dynamically loading images on the panel of GUI
This problem is getting solved if i use the Refresh function in the button handler. But I have a function where i am generating Jpeg images dynamically in a separate script. And i need to load these images on GUI as soon as they start generating. They have common names like xyz1.jpeg and xyz2.jpeg. And i need to start loading images one after another on the gui panel when they are created. these images are created one after another with a particular time delay(not constant). So i have to check when they are created, and i should load them on gui. So how should i communicate to the gui that image has been created and it should load the image ? On Dec 2, 2007 4:29 PM, Varsha Purohit [EMAIL PROTECTED] wrote: hello everyone, i made a small applicatin where i need to display an image on a panel. and then when i press the read button it should read another image and display it on the same panel. Its working but i have to press the read button two times then only its working import wx import os APP_SIZE_X = 700 APP_SIZE_Y = 300 class MainWindow(wx.Frame): def __init__(self): wx.Frame.__init__(self,None,-1,Agent-Based Model of Residential Development, size = (APP_SIZE_X, APP_SIZE_Y)) self.panel = wx.Panel(self,-1) self.imageFile = r10001t0.asc.jpg # provide a diff file name in same directory/path self.bmp = wx.Image(self.imageFile,wx.BITMAP_TYPE_JPEG).ConvertToBitmap() wx.StaticBitmap(self.panel, -1, self.bmp, (20,20), (80,120)) button42 = wx.Button(self.panel, -1, Read, pos=(240,20)) self.Bind(wx.EVT_BUTTON, self.OnRead ,button42) def OnRead(self,event): self.imageFile1=DSCN3378.jpg # you have to provide a diff image file name self.bmp = wx.Image(self.imageFile1,wx.BITMAP_TYPE_JPEG).ConvertToBitmap() self.obj = wx.StaticBitmap(self.panel, -1, self.bmp, (20,20), (80,120)) self.obj.Refresh() app = wx.PySimpleApp() MainWindow().Show() app.MainLoop() Load two different jpeg images. -- Varsha -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [wxPython-users] passing file name from one script to the GUI class
hello All, I am attaching two scripts. One is readfile.py which is a gui script where there is a image display panel and a button. Now what i want is when i click on the button, then it should call a function which is there in second script clases_calling.py which basically passes the second image file name to the readfile and it should call imagetobit function of the gui script and display the passed imagefile name. I am getting runtime errors thanks -- Varsha Purohit, Graduate Student from readfile import MainWindow import os class funct: def func_call(self): imagename = r10001t0.asc.jpg newImage = imagetobit(imagename) import wx import os import IO import clases_calling APP_SIZE_X = 700 APP_SIZE_Y = 300 developerData = developers.txt class MainWindow(wx.Frame): def __init__(self): wx.Frame.__init__(self,None,-1,Agent-Based Model of Residential Development, size = (APP_SIZE_X, APP_SIZE_Y)) ##panel = wx.Panel(self,-1) ##wx.StaticText(panel,-1,first,(35,20)) ##self.txtBox1 = wx.TextCtrl(panel,-1,pos=(60,20),size=(30,20)) ## ##wx.StaticText(panel,-1,sec,(95,20)) ##self.txtBox2 = wx.TextCtrl(panel,-1,pos=(120,20),size=(30,20)) ## ##wx.StaticText(panel,-1,third,(155,20)) ##self.txtBox3 = wx.TextCtrl(panel,-1,pos=(185,20),size=(30,20)) self.panel = wx.Panel(self,-1) self.imageFile = r10001t0.asc.jpg self.bmp = wx.Image(self.imageFile,wx.BITMAP_TYPE_JPEG).ConvertToBitmap() wx.StaticBitmap(self.panel, -1, self.bmp, (20,20), (80,120)) button42 = wx.Button(self.panel, -1, Read, pos=(240,20)) self.Bind(wx.EVT_BUTTON, self.OnRead,button42) def OnRead(self,event): clases_calling.func_call(self) ##self.imageFile1=DSCN3378.jpg ##self.bmp = wx.Image(self.imageFile1,wx.BITMAP_TYPE_JPEG).ConvertToBitmap() ##self.obj = wx.StaticBitmap(self.panel, -1, self.bmp, (20,20), (80,120)) ##self.obj.Refresh() ##batch_data = IO.readDevelopers(developerData) ##for model_run in batch_data: ##for rec in batch_data[model_run]: ##self.txtBox1.write(rec.pop(0)) ##self.txtBox2.write(rec.pop(0)) ##self.txtBox3.write(rec.pop(0)) ##self.Destroy() def imagetobit(imagename): self.imageFile1=imagename self.bmp = wx.Image(self.imageFile1,wx.BITMAP_TYPE_JPEG).ConvertToBitmap() self.obj = wx.StaticBitmap(self.panel, -1, self.bmp, (20,20), (80,120)) self.obj.Refresh() app = wx.PySimpleApp() MainWindow().Show() app.MainLoop() ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [wxPython-users]How to avoid the traces of frame or panel window
Hello Everyone, I created a simple frame, but when i move the frame or any panel window i get traces of the windows all over which makes the screen look shabby. How can i avoid getting them ? sample code for a panel is # simple.py import wx app = wx.App() frame = wx.Frame(None, -1, 'simple.py') frame.Show() app.MainLoop() what should i add in the above code to not get the traces of the window. Also, i have another problem, whenever i execute any wxpython program inorder to execute it again i have to close all the programs including the shell and then restart python otherwise i get like 25lines of some stupid error messages having no link to the program. I have to close all python programs again !!! Does anybody now why i am getting this thanks, -- Varsha Purohit ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [wxPython-users] How to save file name of file openedfromwx.FileDialog ?
Hello Alan, What i want is i just need a file picker to chooose the file and display the file name in the text box. I need to open about 4 files like that. That is the front end work. In the back end i am making a list variable to which i have to send the information about the selected files. And that list is read and files are opened in another script. So, i guess i need to improve the code more to choose the file, display just the file information and may be send whole file path to the list. I need to work more on that i guess.Thanks for reminding me... -Varsha On Nov 18, 2007 1:03 AM, Alan Gauld [EMAIL PROTECTED] wrote: Varsha Purohit [EMAIL PROTECTED] wrote I note that you got it wotking but just to clarify... I am actually calling the binding function and then writing it into the text value... class ScrolledWindow(wx.Frame): def __init__(self, parent, id, title): txt1 = wx.TextCtrl(panel, -1, pos=(30, 100), size=(150, 20)) name = self.Bind(wx.EVT_BUTTON, self.OnOpen, button11) txt1.write(name) The Bind function does not execute the handler method it simply registers it within wxPython for future use when the button event is triggered. The return value from Bind is not the return value of the method being bound. The method only gets called when the button is pressed, thats why you have to put the write() call in the event handler itself. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [wxPython-users] How to save file name of file opened from wx.FileDialog ?
Hello Everyone, In my application i need to select a file using open dialog box. And then i dont need to open the file. I just need to display the name of the selected file in a text control. And then open the file in later part of the program. But i am not able to get the file name and display it in the text control. Here is the sample code. import wx import os Fname = '' #Global variable to hold the file name. class ScrolledWindow(wx.Frame): def __init__(self, parent, id, title): wx.Frame.__init__(self, parent, id, title, size=(350, 300)) panel = wx.Panel(self, -1) txt1 = wx.TextCtrl(panel, -1, pos=(30, 100), size=(150, 20)) button11 = wx.Button(panel, -1, Open, pos=(200,100)) self.Bind(wx.EVT_BUTTON, self.OnOpen, button11) txt1.write(Fname) self.Centre() self.Show() def OnOpen(self,event): self.dirname = '' dlg = wx.FileDialog(self, Choose a file, self.dirname,, *.*, wx.OPEN) if dlg.ShowModal()==wx.ID_OK: self.filename=dlg.GetFilename() Fname = self.filename self.dirname=dlg.GetDirectory() dlg.Destroy() app = wx.App() ScrolledWindow(None, -1, 'Aliens') app.MainLoop() Any help is appreciated thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [wxPython-users] How to save file name of file opened fromwx.FileDialog ?
Hi Alan, I am actually calling the binding function and then writing it into the text value... i tried using simple print in the openfile function and it shows the filename. I am trying to return the file name value but even that is not responding... class ScrolledWindow(wx.Frame): def __init__(self, parent, id, title): wx.Frame.__init__(self, parent, id, title, size=(350, 300)) panel = wx.Panel(self, -1) txt1 = wx.TextCtrl(panel, -1, pos=(30, 100), size=(150, 20)) button11 = wx.Button(panel, -1, Open, pos=(200,100)) name = self.Bind(wx.EVT_BUTTON, self.OnOpen, button11) txt1.write(name) self.Centre() self.Show() def OnOpen(self,event): self.dirname = '' dlg = wx.FileDialog(self, Choose a file, self.dirname,, *.*, wx.OPEN) if dlg.ShowModal()==wx.ID_OK: self.filename=dlg.GetFilename() Fname = self.filename self.dirname=dlg.GetDirectory() #f=open(os.path.join(self.dirname, self.filename),'r') #self.control.SetValue(f.read()) # self.txt1.WriteText(Fname) f.close() dlg.Destroy() return Fname app = wx.App() ScrolledWindow(None, -1, 'Aliens') app.MainLoop() I donno the alternative to this now... :( On Nov 17, 2007 3:35 PM, Alan Gauld [EMAIL PROTECTED] wrote: Varsha Purohit [EMAIL PROTECTED] wrote later part of the program. But i am not able to get the file name and display it in the text control. Here is the sample code. Fname = '' #Global variable to hold the file name. You don't need this since its stored in self.filename. class ScrolledWindow(wx.Frame): def __init__(self, parent, id, title): txt1 = wx.TextCtrl(panel, -1, pos=(30, 100), size=(150, 20)) If you want to write to it you need to store it in the object so this should be self.txt1 txt1.write(Fname) You can't write the filename yet as it hasn't been fetched def OnOpen(self,event): self.dirname = '' dlg = wx.FileDialog(self, Choose a file, self.dirname,, *.*, wx.OPEN) if dlg.ShowModal()==wx.ID_OK: self.filename=dlg.GetFilename() Here you get the filename but don't write it to the text control HTH, Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Varsha Purohit ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [wxPython-users] How to save file name of file opened from wx.FileDialog ?
HI Alan, Thanks for suggestion its working now import wx import os class ScrolledWindow(wx.Frame): def __init__(self, parent, id, title): wx.Frame.__init__(self, parent, id, title, size=(350, 300)) panel = wx.Panel(self, -1) self.txt1 = wx.TextCtrl(panel, -1, pos=(30, 100), size=(150, 20)) self.button11 = wx.Button(panel, -1, Open, pos=(200,100)) self.button11.Bind(wx.EVT_BUTTON, self.OnOpen) self.Centre() self.Show() def OnOpen(self,event): self.dirname = '' dlg = wx.FileDialog(self, Choose a file, self.dirname,, *.*, wx.OPEN) if dlg.ShowModal()==wx.ID_OK: self.filename=dlg.GetFilename() self.dirname=dlg.GetDirectory() self.txt1.write(self.filename) dlg.Destroy() app = wx.App() ScrolledWindow(None, -1, 'Aliens') app.MainLoop() On Nov 17, 2007 12:44 PM, Varsha Purohit [EMAIL PROTECTED] wrote: Hello Everyone, In my application i need to select a file using open dialog box. And then i dont need to open the file. I just need to display the name of the selected file in a text control. And then open the file in later part of the program. But i am not able to get the file name and display it in the text control. Here is the sample code. import wx import os Fname = '' #Global variable to hold the file name. class ScrolledWindow(wx.Frame): def __init__(self, parent, id, title): wx.Frame.__init__(self, parent, id, title, size=(350, 300)) panel = wx.Panel(self, -1) txt1 = wx.TextCtrl(panel, -1, pos=(30, 100), size=(150, 20)) button11 = wx.Button(panel, -1, Open, pos=(200,100)) self.Bind(wx.EVT_BUTTON, self.OnOpen, button11) txt1.write(Fname) self.Centre() self.Show() def OnOpen(self,event): self.dirname = '' dlg = wx.FileDialog(self, Choose a file, self.dirname,, *.*, wx.OPEN) if dlg.ShowModal()==wx.ID_OK: self.filename=dlg.GetFilename() Fname = self.filename self.dirname=dlg.GetDirectory() dlg.Destroy() app = wx.App() ScrolledWindow(None, -1, 'Aliens') app.MainLoop() Any help is appreciated thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [wxPython-users] Displaying filename of open dialog box
Hello, I am new to wxPython. I have made an application where i created a button which opens the file from a directory. I created a static text box near the button. I want to display the filename of file which is opened using this open button. How can i read the file opened and put that text in the static text box??? thanks, -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [wxPython-users] Loading default values for text box and choice
Hello, I wanted to know how to load text box with the default value Eg. In these lines there is a static text and a text box created ... and if i want to load value '3' in the text box how can i do that ?? wx.StaticText(panel, -1, Random Seed, (550,200)) wx.TextCtrl(panel,-1,pos=(620,200),size=(50,20)) and also in the Choice box simpleList2 = ['Unbiased Attitude ','Biased Attitude'] wx.Choice(panel, -1, (670,570),choices=simpleList2) if i want to load the first value of simplelist2 in the choice box by default when the application runs... thanks in advance, -- Varsha Purohit, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] File format conversion
Hello Alan, It is a file having colour data grid.. just like any simple ascii file and i need to manipulate the numbers with colours. But at this stage i am not much bothered with colurs i can associate it with simple RGB value for all different numbers. ex. of such simple file can be like this.. ncols 4 nrows 4 xllcorner 392800 yllcorner 5376340 cellsize 55 NODATA_value - 9 3 7 3 8 3 2 7 3 2 1 3 3 7 3 2 and i need to associate each pixel of the image with this data in the ascii... Did that help ?? thanks, Varsha On Nov 12, 2007 1:06 AM, Alan Gauld [EMAIL PROTECTED] wrote: Varsha Purohit [EMAIL PROTECTED] wrote In one application i want to convert format of ascii file to binary file. That depends entirely on what the ASCII file contains. Is it a comma separated list of RGB values? Or is it a uuencode of the binary data? Or something else... And using that binary file in a function of PIL i can convert it to an image file. Depending on the formatting you may not need PIL, but it all depends on what the ASCII contains. So i wanted to know how to convert the file format in python... is it possible by Numpy ?? You may only need one of the encode/decode libraries for something like uuencoding or maybe the struct module will do if its just raw bitmap data. other alternative to convert an ascii into an bitmap image directly in PIL without Numpy?? Yes you can always do it manually but it all depends on the format of the data. -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [wxPython-users] Executing a python script in WxPython
Hello, I have an application where i need to run a python script from wxpython gui. I am calling the script from the button click event. And the moment button is pressed the python script should be executed. thanks, Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [wxPython-users] Executing a python script in WxPython
Thanks for the help its working now !!! On Nov 13, 2007 7:34 PM, Kent Johnson [EMAIL PROTECTED] wrote: Varsha Purohit wrote: Hello, I have an application where i need to run a python script from wxpython gui. I am calling the script from the button click event. And the moment button is pressed the python script should be executed. If you can import the script and call the required function that is the simplest approach. If you have to run the script as from the command line then use os.system or subprocess.Popen. Kent thanks, Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] File format conversion
Hello All, In one application i want to convert format of ascii file to binary file. And using that binary file in a function of PIL i can convert it to an image file. So i wanted to know how to convert the file format in python... is it possible by Numpy ?? And is there any other alternative to convert an ascii into an bitmap image directly in PIL without Numpy?? thanks, -- Varsha ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Difference between Perl and Python
Hello everyone, I wanted to know what are the differences between perl and python, since both of them are scripting languages... thanks -- Varsha, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Formbuffer question in PIL
Hello all, I need some help in using formbuffer function in PIL. Does anybody have sample program related to this ? thanks, -- Varsha ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] Formbuffer question in PIL
oops.. i wanted to ask about frombuffer which is in image library of PIL. I read the documentation but wanted a small sample program to understand its function... On 10/13/07, Varsha Purohit [EMAIL PROTECTED] wrote: Hello all, I need some help in using formbuffer function in PIL. Does anybody have sample program related to this ? thanks, -- Varsha -- Varsha Purohit, Graduate Student, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] printing bitmap image dynamically reading data inwxpython
Hi Alan, Thanks for the response. Its not a home work problem its actually a task i need to complete as i am tryin to make some tool which will be helpful to use as a script in arcgis. i kinda got some clue will surely ask help if i get stuck somewhere coz i know its difficult to put down in words of what i wanna do :( thanks, Varsha On 10/1/07, Alan Gauld [EMAIL PROTECTED] wrote: Varsha Purohit [EMAIL PROTECTED] wrote I want to create a wxpython program where i am reading a list having integer values like [1,2,3,4]. and i need to display the output value as bitmap image which shd be coloured after reading the values. Like 1=red, 2=yellow, 3=orange etc and it displays the output in colours at proper coordinates by matching values of the array. Sounds like a fun project. Have you any plans on how to go about it? Are you having problems? Or are you just sharing your excitement at the challenge? I need to make a script file for arcgis tool which converts the ascii data to a coloured bitmap image at given coordinates. I dunno much about arcgis but again it sounds like a reasonable thing to do. Let us know how you get on. If you run into problems ask questions we might be able to help. However since it seems to be a homework type exercise we can't solve it for you. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] printing bitmap image dynamically reading data in wxpython
Hello All, I want to create a wxpython program where i am reading a list having integer values like [1,2,3,4]. and i need to display the output value as bitmap image which shd be coloured after reading the values. Like 1=red, 2=yellow, 3=orange etc and it displays the output in colours at proper coordinates by matching values of the array. I need to make a script file for arcgis tool which converts the ascii data to a coloured bitmap image at given coordinates. thanks, -- Varsha Purohit, Graduate Student, San Diego State University ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] creating image from a given data in wxpython
Hi All, I basically wanna create a bitmap image in python. This will be basically in pixels. X and y coordinates will be specified in the program and python should create an image by matching the colours. I came across a function called wx.ImageFromData which book claims that it creates a bitmap image in pixels. But i am not getting proper implementation of this function on net... thanks,, Varsha On 9/30/07, Varsha Purohit [EMAIL PROTECTED] wrote: Hello All, I want to create a wxpython program where i am reading a list having integer values like [1,2,3,4]. and i need to display the output value as bitmap image which shd be coloured after reading the values. Like 1=red, 2=yellow, 3=orange etc and it displays the output in colours at proper coordinates by matching values of the array. I need to make a script file for arcgis tool which converts the ascii data to a coloured bitmap image at given coordinates. thanks, -- Varsha Purohit, Graduate Student, San Diego State University -- Varsha Purohit, Graduate Student, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor]Help needed to read Ascii file in wxPython
Hello everyone, I need a basic tutorial which can help me in reading or writing ascii grid file thanks in advance, -- Varsha Purohit, Graduate Student, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor]Help needed to read Ascii file in wxPython
Hi Kent, I am writing a program basically in python gui to open a file and display its content. File contains ascii data... here is an example of that. a text file having info like this ncols 4 nrows 4 xllcorner 392800 yllcorner 5376340 cellsize 55 NODATA_value - 9 3 7 3 8 3 2 7 3 2 1 3 3 7 3 2 it has predefined rows and colns... i know similar program in simple python but wanna figure out how to do that in wxpython... thanks, Varsha On 9/27/07, Kent Johnson [EMAIL PROTECTED] wrote: Varsha Purohit wrote: Hello everyone, I need a basic tutorial which can help me in reading or writing ascii grid file What is an ascii grid file? Reading and writing text files should be covered in any Python tutorial, find one you like here: http://wiki.python.org/moin/BeginnersGuide/NonProgrammers Kent -- Varsha Purohit, Graduate Student, San Diego State University ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Reading/Writing Ascii text file
Hello friends, I wanted a link or tutorial to help me understand how to read or write ascii text file in python. with and without using Numpy. If you have any example that would also help me understand better. thanks, Varsha Purohit, Graduate Student ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] printing value returning from a Class
Hello friends,, I have a problem in displaying data which i have invoked from class. City is the name of the class which i havent displayed here. There is another script using that class. It has a function name setCities which takes a text file as argument. Text file contains name of the city, x and y location. there are 4 datas in 4 different lines. Code is as follows. import City def setCities(inFile): # puts city.txt content into City class objects # the field order of input file is: name x y x, y are integers. data are in newlines. f = open(inFile, 'r') body = f.readlines() f.close() cities = [] # list of cities for row in body: cityData = row.strip().split() cityName = cityData[0] cityX = cityData[1] cityY = cityData[2] newCity = City(cityName, cityX, cityY) # city class is invoked cities.append(newCity) return cities abc = setCities(C:\MS\sem5\Lab2_scripts\cities.txt) # setCities function will return the array with values read from the file. print abc I am getting output like [city.City instance at 0x023E82D8, city.City instance at 0x023E8300, city.City instance at 0x023E8350, city.City instance at 0x023E83C8] I want the data and not the instance... what should i do ?? -- Varsha Purohit, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Accessing Values of specific column in a 2D list or array
Hello, Suppose i have a 2D list(grid) like grid = [[1,1,2,7,6,9],\ [,9,1,1,1,9,1],\ [8,1,2,0,0,4],\ [1,4,1,1,8,5]] how can i access to all the elements of the list from column no. 5. output should be like [6,9,0,8]... thanks,- Varsha Purohit, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Accessing Values of specific column in a 2D list or array
Hello, Suppose i have a 2D list(grid) like grid = [[1,1,2,7,6,9],\ [,9,1,1,1,9,1],\ [8,1,2,0,0,4],\ [1,4,1,1,8,5]] how can i access to all the elements of the list from column no. 5. output should be like [6,9,0,8]... thanks,- Varsha Purohit, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] [tutor] Difference between index and find in manipulating strings
Hello, i have again very basic question in python string management. I am not able to understand how find and index works and what do they actually return. line = this is varsha print line.find(is) 2 print line.rfind(is) 5 print line.rfind(varsha) 8 print line.index(varsha) 8 what does 2 in first line signifies... and why rfind gave 5 as an output... can anybody pls explain me what exactly is interpreter tryin to return. -- Varsha Purohit, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] [tutor] Difference between index and find in manipulating strings
Thanks guys it was really helpful i m just a beginner in python start to program since two days back. So finding little difficulty with some concepts. On 9/2/07, Ricardo Aráoz [EMAIL PROTECTED] wrote: Varsha Purohit wrote: Hello, i have again very basic question in python string management. I am not able to understand how find and index works and what do they actually return. line = this is varsha print line.find(is) 2 print line.rfind(is) 5 print line.rfind(varsha) 8 print line.index(varsha) 8 what does 2 in first line signifies... and why rfind gave 5 as an output... can anybody pls explain me what exactly is interpreter tryin to return. Sure. The 2 in first line means the string 'is' begins in line[2] that would be the 'is' in 'this' (remember line's first character 't' is line[0]). OTOH rfind looks for the first appearance of 'is' in line but starting from the right, that would be the word 'is' which starts at line[5]. As there is only one occurrence of 'varsha' in line both methods, find and rfind will give the same answer : 8. From Python 2.5 documentation : index( sub[, start[, end]]) Like find(), but raise ValueError when the substring is not found. HTH -- Varsha Purohit, Graduate Student, San Diego State University ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
