dot() and tensordot()
hi can numpy.dot() be used instead of tensordot()? is there any performance difference? I am talking about operation btw numpy arrays of dimensions 50 X 20,000 where elements are of float type. i tried posting in numpy group where i had gotten membership..but when i post a msg it says posting by non member and so doesn't show up :-( royG -- http://mail.python.org/mailman/listinfo/python-list
parsing directory for certain filetypes
hi
i wrote a function to parse a given directory and make a sorted list
of files with .txt,.doc extensions .it works,but i want to know if it
is too bloated..can this be rewritten in more efficient manner?
here it is...
from string import split
from os.path import isdir,join,normpath
from os import listdir
def parsefolder(dirname):
filenms=[]
folder=dirname
isadr=isdir(folder)
if (isadr):
dirlist=listdir(folder)
filenm=""
for x in dirlist:
filenm=x
if(filenm.endswith(("txt","doc"))):
nmparts=[]
nmparts=split(filenm,'.' )
if((nmparts[1]=='txt') or (nmparts[1]=='doc')):
filenms.append(filenm)
filenms.sort()
filenameslist=[]
filenameslist=[normpath(join(folder,y)) for y in filenms]
numifiles=len(filenameslist)
print filenameslist
return filenameslist
folder='F:/mysys/code/tstfolder'
parsefolder(folder)
thanks,
RG
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Re: parsing directory for certain filetypes
On Mar 10, 8:03 pm, Tim Chase wrote: > In Python2.5 (or 2.4 if you implement the any() function, ripped > from the docs[1]), this could be rewritten to be a little more > flexible...something like this (untested): > that was quite a good lesson for a beginner like me.. thanks guys in the version using glob() >path = os.path.normpath(os.path.join(folder, '*.txt')) >lst = glob.glob(path) is it possible to check for more than one file extension? here i will have to create two path variables like path1 = os.path.normpath(os.path.join(folder, '*.txt')) path2 = os.path.normpath(os.path.join(folder, '*.doc')) and then use glob separately.. or is there another way? RG -- http://mail.python.org/mailman/listinfo/python-list
rmdir problem
hi i am checking if a directory exists and if it does i want to delete it and its contents.then i want to create the directory before creating files in it. def myfolderops(): testdir='..\mytestdir' #if dir exist remove it if isdir(testdir): rmdir(testdir) #again create directory mkdir(testdir) I am working on WinXP and logged in as admin in WinXP. when there is no dir called '..\mytestdir' or an empty dir this code works removing and creating the directory.but if the directory exists with contents already then it causes an error 145 when rmdir is executed.the message says 'directory is not empty' what should i do to correct this? (i need to remove the dir with its contents because each time i will be putting diff files into it and donot want them to be mixed with old files) thanks RG -- http://mail.python.org/mailman/listinfo/python-list
Re: rmdir problem
On Mar 11, 3:37 pm, Paul > Have a look at shutil.rmtree > thanks Paul RG -- http://mail.python.org/mailman/listinfo/python-list
need a function to create eigenface image
hi
while trying to make an eigenface image from a numpy array of floats i
tried this
from numpy import array
import Image
imagesize=(200,200)
def makeimage(inputarray,imagename):
inputarray.shape=(-1,)
newimg=Image.new('L', imagesize)
newimg.putdata(inputarray)
newimg.save(imagename)
since i am using images of 200X200 size,
i use an array with 4 elements like
[ -92.35294118 -81.88235294 -67.58823529 ..., -3.47058824
-13.23529412 -9.76470588]
the problem is ,i get an image that is too dark.it looks like a face
but is too dark that even different arrays will create images rhat all
look alike!..
is there a way to 'tone it down' so that i can generate an eigenface
that can be displayed better?
thanks
RG
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changing names of items in a list
hi i am trying to rename extension of files in a directory..as an initial step i made a method in class ConvertFiles: def __init__(self,infldr,outfldr): self.infldr=infldr self.outfldr=outfldr self.origlist=os.listdir(infldr) def renamefiles(self,extn): for x in self.origlist: x=x+"."+extn ... later when i print self.origlist i find that the elements of list are unchanged..even tho a print x inside the renamefiles() shows that extn is appended to x .. why does this happen? RG -- http://mail.python.org/mailman/listinfo/python-list
how to remove suffix from filename
hi when parsing a list of filenames like ['F:/mydir/one.jpg','F:/mydir/ two.jpg'] etc i want to extract the basename without the suffix...ie i want to get 'one','two' etc and not 'one.jpg' is there a function in python to do this or do i have tosplit it ..? thanks RG -- http://mail.python.org/mailman/listinfo/python-list
dividing tuple elements with an int or float
hi i am trying to resize some images.First i'd read the size as a 2 tuple and then i want to divide it by 2 or 4 or 2.5 etc.. suppose origsz=(400,300) i want to divide the origsize by 2.5 so i can resize to (160,120) scale=2.5 how can i get the newsz? obviously origsz/2.5 won't work .. thanks RG -- http://mail.python.org/mailman/listinfo/python-list
