Python Classes

[Sam Collett]

I have modified the code as follows (may wrap):

class clFile:
    def __init__(self,path_to_file):
        self.f = path_to_file
        self.exists = os.path.exists(self.f)
        if self.exists == 0:
            return None

    def getFileName(self,blnExt=None):
        """
        blnExt = show file extension (put in value other than 0 or
None to show the extension)
        """
        if blnExt:
            result = os.path.basename(self.f)
        else:
            result = os.path.splitext(os.path.basename(self.f))[0]
        return result

    def getFileExt(self):
        result = os.path.splitext(self.f)[1]
        return result

    def getDir(self):
        result = os.path.dirname(self.f)
        return result

    def getSize(self):
        
        size = int(os.path.getsize(self.f))
        if size < 3072: #<3kb
            return "%db" % size
        elif size < 2097152: #<2mb
            return "%.2fkb" % (size/1024.)
        else: #>2mb
            return "%.2fmb" % (size/1048576.)

    def modified(self):
            import time
            return time.strftime('%d/%m/%Y;
%I:%M%p',time.gmtime(os.path.getmtime(self.f)))

What I want to do is if the file does not exist to return nothing or
an error. I thought the following code would work, but it didn't. How
could I get it to work?

self.exists = os.path.exists(self.f)
    if self.exists == 0:
        return None

Martin Franklin <martin.franklin at westerngeco.com> wrote in message news:<a67gal$c2a$1 at mail1.wg.waii.com>...
> Sam Collett wrote:
> 
> > I am quite new to Python and have no experience with classes. I have
> > tried a file class, but I am not sure how to get it to work:
> > 
> > class clFile(file):
> >     
> >     def getFileName(blnExt=None):
> >         """
> >         file = path to file
> >         blnExt = show file extension (put in value other than 0 or
> > None to show the extension)
> >         """
> >         import os
> >         if blnExt:
> >             result = os.path.basename(file)
> >         else:
> >             result = os.path.splitext(os.path.basename(file))[0]
> >         del os
> >         return result
> > 
> >     def getFileExt():
> >         import os.path
> >         result = os.path.splitext(file)[1]
> >         del os
> >         return result
> > 
> >     def getDir():
> >         import os
> >         result = os.path.dirname(file)
> >         del os
> >         return result
> > 
> > I wondered if there was a way to do something like the following:
> > 
> > myfile = clFile("c:\\somedir\\dir with spaces\\foo.txt")
> > myfile.getDir would return c:\somedir\dir with spaces\
> > myfile.getFileExt would return .txt
> > myfile.getFileName would return foo.txt or foo
> 
> Ok try this to get you working:
> import os # do this at the top....
> 
> class clFile:
>     def __init__(self, file):
>         # constructor called when you create an instance (object) of this 
> class
>         self.file=file 
>         # self.file instance variable bound to file object
>         #(in this case the file name passed to the class constructor)
>         
>     def getFileName(self, blnExt=None):
>         # return filename with or without the extension..
>         if blnExt:
>             result = os.path.basename(self.file)
>         else:
>             result = os.path.splitext(os.path.basename(self.file))[0]
>         return result
>     
>     def getFileExt(self):
>         # return file extension
>         return os.path.splitext(self.file)[1]
>     
>     
>     def getDir(self):
>         # return the file basname (directory/folder)
>         return os.path.dirname(self.file)
>        
>          
>          
> # now for testing.....
> if __name__=='__main__':
>     clf=clFile('/home/bpse/crapola.bot') # create an instance of clFile
>     
>     # call it's methods....
>     
>     print clf.getFileExt() 
>     print clf.getFileName(blnExt=1)    
>     print clf.getFileName()
>     print clf.getDir()
> 
> 
> 
> 
> You should really work your way through the tutorial (at least the classes 
> bit) on:-
> http://www.python.org/doc/current/tut/tut.html