[Tutor] Handling Objects

[Kent Johnson]

Eric Walker wrote:
> Thanks Kent.. I think that would work for what I am doing. So is it safe to 
> say that python doesn't do variable interpolation like perl..?

I think so, though I don't really speak perl. The closest approximation is the string formatting operation and the string.Template class.
http://docs.python.org/lib/typesseq-strings.html
http://docs.python.org/lib/node109.html

Kent

> 
> Thanks in advance.
> 
> Python Newbie...
> 
> 
> On Wednesday 05 October 2005 05:20 pm, Kent Johnson wrote:
> 
>>Eric Walker wrote:
>>
>>>Well,
>>>I think I probably can do this easier in perl but I took a vow I would
>>>try and learn python.  I know I am using classes here and really don't
>>>need objects. This is just another way for me to learn how to work with
>>>classes within python. My object actually will be storing like 5 or 6
>>>different attributes but I didn't include them in the example.  These
>>>attributes  will be certain things that are read from the file.  Once I
>>>get the objects i want to create in another directory the same files with
>>>the same names but put different data into the new files depending on
>>>what I read from the original files.
>>
>>OK, I would just make a list of the objects, since one of the attributes is
>>the name you have everything you need in the object.
>>
>>def getNames():
>>    import os
>>    currentDir=os.getcwd()
>>    temp=currentDir + '/TEMP'
>>    os.chdir(temp)
>>    baseList=os.listdir(".")
>>    data = []
>>    for name in baseList:
>>        data.append(TPROJ(name))
>>        print name
>>    return data
>>
>>then to use the data something like
>>for datum in data:
>>    f = open(datum.name, 'w')
>>    #etc
>>
>>Kent
>>
>>
>>>Python Newbie....
>>>
>>>On Wednesday 05 October 2005 04:29 pm, Kent Johnson wrote:
>>>
>>>>Eric Walker wrote:
>>>>
>>>>>New to Python and trying to do some class stuff with a simple task.
>>>>>Problem:
>>>>>1) get a list of file names in a directory
>>>>>2) create variables with the same name of each filename pulled from the
>>>>>directory.
>>>>>3) Create an object for each and pass into the __init__ method the
>>>>>stringname of the file name.
>>>>>
>>>>>This way I get a collection of objects that are the same name as the
>>>>>file name and within each instance of the class , a particular
>>>>>attribute will have the string name of the object.  Hope this isn't too
>>>>>confusing.. example.
>>>>
>>>>What will you do with the names and objects once you have them? A better
>>>>approach is probably to keep a dictionary that maps names to objects. If
>>>>your object is really just storing the name you might as well just keep a
>>>>list of names - the object isn't adding any value. If the object is going
>>>>to have more behaviour then use a dict. If you really just want to print
>>>>the names then you don't need to store them at all. For example with a
>>>>dict:
>>>>
>>>>class TPROJ:
>>>>   # as before
>>>>
>>>>def getNames():
>>>>   import os
>>>>   currentDir=os.getcwd()
>>>>   temp=currentDir + '/TEMP'
>>>>   os.chdir(temp)
>>>>   baseList=os.listdir(".")
>>>>   nameDict = {}
>>>>   for name in baseList:
>>>>       nameDict[name] = TPROJ(name)
>>>>       print name
>>>>   return nameDict
>>>>
>>>>HTH,
>>>>Kent
>>>>
>>>>
>>>>>class TPROJ:
>>>>>   def __init__(self,value):#createMethod auto executes since it has __
>>>>>       self.BASENAME = value
>>>>>
>>>>>  def display(self):#display method
>>>>>       print self.BASENAME
>>>>>
>>>>>def getNames():
>>>>>   import os
>>>>>   currentDir=os.getcwd()
>>>>>   temp=currentDir + '/TEMP'
>>>>>   os.chdir(temp)
>>>>>   baseList=os.listdir(".")
>>>>>   for name in baseList:
>>>>>       name = TPROJ(name)
>>>>>       print name
>>>>>
>>>>>Can anyone see what I am trying to do?
>>>>>
>>>>>Python Newbie.......
>>>>>_______________________________________________
>>>>>Tutor maillist  -  Tutor at python.org
>>>>>http://mail.python.org/mailman/listinfo/tutor
>>>>
>>>>_______________________________________________
>>>>Tutor maillist  -  Tutor at python.org
>>>>http://mail.python.org/mailman/listinfo/tutor
>>
>>_______________________________________________
>>Tutor maillist  -  Tutor at python.org
>>http://mail.python.org/mailman/listinfo/tutor
> 
>