🌐 Mailman 3 February 2005 - Python-list - python.org

Minor, but annoying legend problem in matplotlib
by Jorl Shefner Feb. 28, 2005

Feb. 28, 2005

I have a problem that I run into a lot with the 'legend' command's default behavior. I've found a work-around but I wonder if there's a better way. For a simple example, take the following: ________________________________ x= [1,2,3,4,5,6,7,8] a= [5,3,2,4,6,5,8,7] b= [4,1,3,5,2,8,3,6] c= [8,4,9,6,7,3,9,4] DataSets= [a,b,c] Symb= ['k-o','k--s','k-.^'] for index,d in enumerate(DataSets): plot(x,DataSets[index],Symb[index]) legend(["a","b","c"]) _______________________________ This behaves just as I would want it to. Normally, though I want 'open' markers, which (AFAIK) require me to set the color to 'w' (white), and so the (white-on-white) lines won't show up in this case (the markers still have black outlines). I tried using two colors in one marker definition, 'k-wo', but that didn't work. The obvious solution is to plot the lines and symbols in two different commands: _______________________________ Symb= ['wo','ws','w^'] LineType= ['k-','k--','k-.'] for index,d in enumerate(DataSets): plot(x,DataSets[index],LineType[index]) plot(x,DataSets[index],Symb[index]) legend(["a","b","c"]) _______________________________ This produces the correct plot, but the legend here alternates between symbol and marker in its what uses for designating each dataset (a uses 'marker a', b uses 'line b', c uses 'marker c'). Is there some rationale for this being the default behavior? The workaround I've found has been to use two separate loops for the symbol and line plotting: _______________________________ Symb= ['wo','ws','w^'] LineType= ['k-','k--','k-.'] #Loop 1 for index,d in enumerate(DataSets): plot(x,DataSets[index],LineType[index]) # Loop 2 for index,d in enumerate(DataSets): plot(x,DataSets[index],Symb[index]) legend(["a","b","c"]) _______________________________ This works and will give me a legend that uses only marker symbols in it, as desired. It's not an ideal solution though as I often have some moderate amount of processing within the loop that I'd rather not have to repeat or write out to some temporary variable just in order to have it available for the second loop. I've gotten around this before for somewhat similar cases using suggestions from this group of explicitly defining the values the legend will use: L1= plot(x,y,... but I can't figure how to do this here because of the looping over the data sets. On a related note, is there any way to increase the size of the markers within the legend? TIA, J.S. -- Actual e-mail: <Firstname> 'dot' <Lastname> @comcast.net

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Re: My C module crashes
by Daniel Dittmar Feb. 28, 2005

Feb. 28, 2005

Egil Moeller wrote: > I've written a C-module for Python, and it works as intended, but > obviously does something wrong with its memmory management (refference > counting), as it causes Python to segfault now and then (randomly, > whey :S) You can atry to use the Python function sys.getrefcount. Print the refcount of the parameter values before and after your extension gets called and print the refcount of the return value (s). I once forgot to increment the refcount of the None object which was put into the return tuple. If you pass a list as a parameter, you should also print the refcounts of the list elements etc. Daniel Dittmar

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Re: String Replace Problem...
by wes weston Feb. 28, 2005

Feb. 28, 2005

andrea.gavana(a)agip.it wrote: > Hello NG, > > probably this is a basic question, but I'm going crazy... I am unable > to find an answer. Suppose that I have a file (that I called "Errors.txt") > which contains these lines: > > MULTIPLY > 'PERMX' @PERMX1 1 34 1 20 1 6 / > 'PERMX' @PERMX2 1 34 21 41 1 6 / > 'PERMX' @PERMX3 1 34 1 20 7 14 / > 'PERMX' @PERMX4 1 34 21 41 7 14 / > 'PERMX' @PERMX5 1 34 1 20 15 26 / > 'PERMX' @PERMX6 1 34 21 41 15 26 / > 'PERMX' @PERMX7 1 34 1 20 27 28 / > 'PERMX' @PERMX8 1 34 21 41 27 28 / > 'PERMX' @PERMX9 1 34 1 20 29 34 / > 'PERMX' @PERMX10 1 34 21 41 29 34 / > 'PERMX' @PERMX11 1 34 1 20 35 42 / > 'PERMX' @PERMX12 1 34 21 41 35 42 / > 'PERMX' @PERMX13 1 34 1 20 43 53 / > 'PERMX' @PERMX14 1 34 21 41 43 53 / > 'PERMX' @PERMX15 1 34 1 20 54 61 / > 'PERMX' @PERMX16 1 34 21 41 54 61 / > / > > I would like to replace all the occurrencies of the "keywords" (beginning > with the @ (AT) symbol) with some floating point value. As an example, this > is what I do: > > # --- CODE BEGIN > > import re > import string > > # Set Some Dummy Parameter Values > parametervalues = range(1, 17) > > # Open And Read The File With Keywords > fid = open("Errors.txt","rt") > onread = fid.read() > fid.close() > > # Find All Keywords Starting with @ (AT) > regex = re.compile("[\@]\w+", re.IGNORECASE) > keywords = regex.findall(onread) > > counter = 0 > > # Try To Replace The With Floats > for keys in keywords: > pars = parametervalues[counter] > onread = string.replace(onread, keys, str(float(pars))) > counter = counter + 1 > > # Write A New File With Replaced Values > fid = open("Errors_2.txt","wt") > fid.write(onread) > fid.close() > > # --- CODE END > > > Now, I you try to run this little script, you will see that for keywords > starting from "@PERMX10", the replaced values are WRONG. I don't know why, > Python replace only the "@PERMX1" leaving out the last char of the keyword > (that are 0, 1, 2, 3, 4, 5, 6 ). These values are left in the file and I > don't get the expected result. > > Does anyone have an explanation? What am I doing wrong? > > Thanks to you all for your help. > > Andrea. > > ------------------------------------------------------------------------------------------------------------------------------------------ > Message for the recipient only, if received in error, please notify the > sender and read http://www.eni.it/disclaimer/ > > andrea, If you put in "keywords.reverse()" after getting keywords, things may work better. Though not a good fix, it illustrates part of the problem. If you replace "@PERMX1" you also replace part of "@PERMX10". Wouldn't it be better to read the file as lines instead of strings? wes

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Share your SciTEGlobal.properties pls~~~~
by DENG Feb. 28, 2005

Feb. 28, 2005

hi, im new to Python, i chose SciTE as my Python editor. but the problem is SciTE needs to be config carefully, are there anyone use SciTE too? can you share your SciTEGlobal.properties file? black background solution is prefered:) thanks in advance best regards

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by mike Feb. 28, 2005

Feb. 28, 2005

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String Replace Problem
by andrea.gavana＠agip.it Feb. 28, 2005

Feb. 28, 2005

Hello Peter And NG, thank you a lot... now I'm blaming myself, how couldn't I see it? I will probably go for the re.sub (if it is not too complicated, I'm not a Python expert and even less expert of RegEx things), if not I'll try your suggestion of sorting the strings by length. Thanks a lot. Andrea. ------------------------------------------------------------------------------------------------------------------------------------------ Message for the recipient only, if received in error, please notify the sender and read http://www.eni.it/disclaimer/

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Re: String Replace Problem...
by Peter Hansen Feb. 28, 2005

Feb. 28, 2005

andrea.gavana(a)agip.it wrote: > 'PERMX' @PERMX1 1 34 1 20 1 6 / ... > 'PERMX' @PERMX10 1 34 21 41 29 34 / ... > > I would like to replace all the occurrencies of the "keywords" (beginning > with the @ (AT) symbol) with some floating point value. As an example, this > is what I do: > > # Find All Keywords Starting with @ (AT) > regex = re.compile("[\@]\w+", re.IGNORECASE) You don't need the [, \ or ] around the "@" as it is not a special character... (but that's not your problem here). > keywords = regex.findall(onread) Here you get a list, in order, of all the matches, including these: "@PERMX1" and "@PERMX10" > # Try To Replace The With Floats > for keys in keywords: > onread = string.replace(onread, keys, str(float(pars))) Here you iterate through the list, replacing *all* occurrences of each of them, one at a time, in the full string. Now imagine what happens to things like "@PERMX10" in the full string when you are replacing "@PERMX1".... > Now, I you try to run this little script, you will see that for keywords > starting from "@PERMX10", the replaced values are WRONG. I don't know why, > Python replace only the "@PERMX1" leaving out the last char of the keyword > (that are 0, 1, 2, 3, 4, 5, 6 ). These values are left in the file and I > don't get the expected result. > > Does anyone have an explanation? What am I doing wrong? Basically, you are replacing things in the string one by one without taking into account the fact that some of those things contain others of those things. Looking into "re.sub" might help, although in this case you could solve the problem by doing one of several other things. The simplest one that comes to mind is to sort the list of keywords in reverse order by length of string, so that you replace the longest items first. -Peter

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wxGrid
by Gensek Feb. 28, 2005

Feb. 28, 2005

I have a grid. I want to sort it when a column label is clicked. I know about the EVT_GRID_LABEL_LEFT_DCLICK event, but that is not enough. I do not merely need to know that a label was clicked. I need to know which label was clicked. I do not know how to do that. I suspect you might know. I request that you tell me. I also wish to know some other things: how to find out the location of a mouse pointer in a wxWindow (or at least the frame), and how to change the color of a single specified pixel in a bitmap. I use Python 2.3, wxPython 2.4.2.

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String Replace Problem...
by andrea.gavana＠agip.it Feb. 28, 2005

Feb. 28, 2005

Hello NG, probably this is a basic question, but I'm going crazy... I am unable to find an answer. Suppose that I have a file (that I called "Errors.txt") which contains these lines: MULTIPLY 'PERMX' @PERMX1 1 34 1 20 1 6 / 'PERMX' @PERMX2 1 34 21 41 1 6 / 'PERMX' @PERMX3 1 34 1 20 7 14 / 'PERMX' @PERMX4 1 34 21 41 7 14 / 'PERMX' @PERMX5 1 34 1 20 15 26 / 'PERMX' @PERMX6 1 34 21 41 15 26 / 'PERMX' @PERMX7 1 34 1 20 27 28 / 'PERMX' @PERMX8 1 34 21 41 27 28 / 'PERMX' @PERMX9 1 34 1 20 29 34 / 'PERMX' @PERMX10 1 34 21 41 29 34 / 'PERMX' @PERMX11 1 34 1 20 35 42 / 'PERMX' @PERMX12 1 34 21 41 35 42 / 'PERMX' @PERMX13 1 34 1 20 43 53 / 'PERMX' @PERMX14 1 34 21 41 43 53 / 'PERMX' @PERMX15 1 34 1 20 54 61 / 'PERMX' @PERMX16 1 34 21 41 54 61 / / I would like to replace all the occurrencies of the "keywords" (beginning with the @ (AT) symbol) with some floating point value. As an example, this is what I do: # --- CODE BEGIN import re import string # Set Some Dummy Parameter Values parametervalues = range(1, 17) # Open And Read The File With Keywords fid = open("Errors.txt","rt") onread = fid.read() fid.close() # Find All Keywords Starting with @ (AT) regex = re.compile("[\@]\w+", re.IGNORECASE) keywords = regex.findall(onread) counter = 0 # Try To Replace The With Floats for keys in keywords: pars = parametervalues[counter] onread = string.replace(onread, keys, str(float(pars))) counter = counter + 1 # Write A New File With Replaced Values fid = open("Errors_2.txt","wt") fid.write(onread) fid.close() # --- CODE END Now, I you try to run this little script, you will see that for keywords starting from "@PERMX10", the replaced values are WRONG. I don't know why, Python replace only the "@PERMX1" leaving out the last char of the keyword (that are 0, 1, 2, 3, 4, 5, 6 ). These values are left in the file and I don't get the expected result. Does anyone have an explanation? What am I doing wrong? Thanks to you all for your help. Andrea. ------------------------------------------------------------------------------------------------------------------------------------------ Message for the recipient only, if received in error, please notify the sender and read http://www.eni.it/disclaimer/

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How to delete a module file
by Olivier Ravard Feb. 28, 2005

Feb. 28, 2005

Hi everybody, My application enables the developpment of new C++ modules that are dynamically loaded in this application. My problem is that (under Windows) I can't delete a module that have been already imported. I must exiting the application (which is not a good idea for a developpment environnment). i.e. I can't delete "module.pyd" if I made "import module" in the python interpreter. Is there some technics to "unload" modules under python ? or is there a technic to force removing a file even it is used by another application ? Remark : This problem does not exist under Linux. Thanks for your answers and ideas. Olivier

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