Simple wxPython SetLabel question
Hi All, Apologies if this should be seriously obvious. But I am quite new to Python and it is not quite so obvious yet. I have a GUI which will eventually load and display database information. I want the user to be able to browse for a database and then load it. My problem relates to how I set the value of a TextCtrl once the user has selected the database they wish to load. Here is a snip of my code: import wx import os class TestFrame(wx.Frame): def __init__(self): wx.Frame.__init__(self, None, -1, "Code Snip") panel = wx.Panel(self) databaseLbl = wx.StaticText(panel, -1, "Database:") database= wx.TextCtrl(panel, -1, "") databaseBtn = wx.Button(panel, -1, "Browse") self.Bind(wx.EVT_BUTTON, self.OnBrowse, databaseBtn) fetchSizer = wx.BoxSizer(wx.HORIZONTAL) fetchSizer.Add(databaseLbl) fetchSizer.Add(database, -1, wx.LEFT |wx.RIGHT, 5) fetchSizer.Add(databaseBtn) panel.SetSizer(fetchSizer) def OnBrowse(self, event): wildcard = "Access Database (*.mdb) | *.mdb | Access Database (*.MDB) | *.MDB | All Files (*.*) | *.*" dialog = wx.FileDialog(None, "Choose an database", os.getcwd(), "", wildcard, wx.OPEN) if dialog.ShowModal() == wx.ID_OK: path = dialog.GetPath() # # NOW SET TEXTCTRL "database" TO "path" panel.database.SetLabel(path) # dialog.Destroy() app = wx.PySimpleApp() TestFrame().Show() app.MainLoop() The current code returns that "global name 'panel' is not defined" so I must be referring to it in the wrong way. Can any body help? Any directions towards any well recommended tutorials would also be appreciated. Thank you in advance for your time. DevonDan -- http://mail.python.org/mailman/listinfo/python-list
Re: Simple wxPython SetLabel question
Thank you very much Cédric. I thought it would be something very straight forward. -- http://mail.python.org/mailman/listinfo/python-list
Anyone happen to have optimization hints for this loop?
I have some code that takes data from an Access database and processes it into text files for another application. At the moment, I am using a number of loops that are pretty slow. I am not a hugely experienced python user so I would like to know if I am doing anything particularly wrong or that can be hugely improved through the use of another method. Currently, all of the values that are to be written to file are pulled from the database and into a list called "domainVa". These values represent 3D data and need to be written to text files using line breaks to seperate 'layers'. I am currently looping through the list and appending a string, which I then write to file. This list can regularly contain upwards of half a million values... count = 0 dmntString = "" for z in range(0, Z): for y in range(0, Y): for x in range(0, X): fraction = domainVa[count] dmntString += " " dmntString += fraction count = count + 1 dmntString += "\n" dmntString += "\n" dmntString += "\n***\n dmntFile = open(dmntFilename, 'wt') dmntFile.write(dmntString) dmntFile.close() I have found that it is currently taking ~3 seconds to build the string but ~1 second to write the string to file, which seems wrong (I would normally guess the CPU/Memory would out perform disc writing speeds). Can anyone see a way of speeding this loop up? Perhaps by changing the data format? Is it wrong to append a string and write once, or should hold a file open and write at each instance? Thank you in advance for your time, Dan -- http://mail.python.org/mailman/listinfo/python-list
Anyone happen to have optimization hints for this loop?
I have some code that takes data from an Access database and processes it into text files for another application. At the moment, I am using a number of loops that are pretty slow. I am not a hugely experienced python user so I would like to know if I am doing anything particularly wrong or that can be hugely improved through the use of another method. Currently, all of the values that are to be written to file are pulled from the database and into a list called "domainVa". These values represent 3D data and need to be written to text files using line breaks to seperate 'layers'. I am currently looping through the list and appending a string, which I then write to file. This list can regularly contain upwards of half a million values... count = 0 dmntString = "" for z in range(0, Z): for y in range(0, Y): for x in range(0, X): fraction = domainVa[count] dmntString += " " dmntString += fraction count = count + 1 dmntString += "\n" dmntString += "\n" dmntString += "\n***\n dmntFile = open(dmntFilename, 'wt') dmntFile.write(dmntString) dmntFile.close() I have found that it is currently taking ~3 seconds to build the string but ~1 second to write the string to file, which seems wrong (I would normally guess the CPU/Memory would out perform disc writing speeds). Can anyone see a way of speeding this loop up? Perhaps by changing the data format? Is it wrong to append a string and write once, or should hold a file open and write at each instance? Thank you in advance for your time, Dan -- http://mail.python.org/mailman/listinfo/python-list
Re: Anyone happen to have optimization hints for this loop?
Thank you so much for all your advice. I have learnt a lot. In the end, the solution was perhaps self evident. Why try and build a huge string AND THEN write it to file when you can just write it to file? Writing this much data directly to file completed in ~1.5 seconds instead of the 3-4 seconds that any of the .join methods produced. Interestingly, I found that my tests agreed with Bruno. There wasn't a huge change in speed between a lot of the other methods, other than them looking a lot tidier. Again, many thanks. Dan -- http://mail.python.org/mailman/listinfo/python-list
Zipping files
Hi all, I have come across an error while using zipfile and I can't seem to find somewhere that explains the problem. My script needs to be able to take text files from one drive and add them to zip files on another drive. The following seems to work just fine. import zipfile # write test file in working directory directory folder = "J:/" filename = "testing.txt" fullpath = folder+filename fout = open(fullpath, 'wt') fout.write(str1) fout.close() # Add text file to zip file on same drive zFolder = "J:/" zFilename = "testing.zip" zFullpath = zFolder+zFilename zout = zipfile.ZipFile(zFullpath, "w") zout.write(fullpath) zout.close() print fullpath, "successfully added to", zFullpath However, if I change the drive letters to anything other than the drive from which the Python script is saved (e.g. run script from J: but zip to C:), I get the following warning: Traceback (most recent call last): File "J:/test.py", line 18, in zout = zipfile.ZipFile(zFullpath, "w") File "C:\Python25\lib\zipfile.py", line 339, in __init__ self.fp = open(file, modeDict[mode]) IOError: [Errno 13] Permission denied: 'C:/testing.zip' Can anyopne shed some light on what I am missing here? If it has any relevance to the permissions part of the error, I am currently using Windows machines. Thanks in advance for your time. Dan -- http://mail.python.org/mailman/listinfo/python-list
Re: Zipping files
When I saw "Permission denied", this was my suspicion. And I think you are very right. I have just gone back and tried writing to a file outside of C:, in this case C:/output/, and it seems to work again. Would I be right in guessing there is no way around this? Dan -- http://mail.python.org/mailman/listinfo/python-list
Is it possible to produce spider plots?
I want to be able to use Python to produce Spider plots (perhaps you know them as radar plots or star plots). Does anyone know how to achieve this? Are there existing libraries? Direction to any examples, especially those with tutorials, would be greatly appreciated. Cheers, Dan http://www.answers.com/topic/spider-plot -- http://mail.python.org/mailman/listinfo/python-list
