Re: [Tutor] lists and strings

[Hugo González Monteverde]

Hi Mike,

Converting an (almost)arbitrary object into a string is what the Pickle 
module does. CPickle is faster. Take a look into into it in the docs.

Here's an example:

  import cPickle
  lala = [1, 2, 3, 'four', 'V']
  lala
[1, 2, 3, 'four', 'V']


  fileo = open('lala.pkl', 'w')
  cPickle.dump(lala, fileo)
  fileo.close()


  fileo = open('lala.pkl', 'r')
  serialized_data = fileo.read()
  serialized_data
(lp1\nI1\naI2\naI3\naS'four'\np2\naS'V'\na.

  fileo.seek(0)
  recovered = cPickle.load(fileo)
  recovered
[1, 2, 3, 'four', 'V']
 

See the docs and feel free to ask if there is some part oyu do not 
understand.

Hope it helps!

Hugo

Mike Haft wrote:
 Hello,
  I've been working on a problem and have now sorted most of it (thanks
 to some help from the list).
 
 All the ways of writing data to a file I know keep telling me that lists
 can't be written to the file. I'm trying to convert data from one set of
 files into files of a different format. But the easiest way to get the
 data from the first set of files is in a list(s).
 
 So, is there any way to convert lists to strings? Or a way to write lists
 to a file?
 
 Thanks
 
 Mike
 
 ___
 Tutor maillist  -  Tutor@python.org
 http://mail.python.org/mailman/listinfo/tutor
 
___
Tutor maillist  -  Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] lists and strings

[Pujo Aji]

yes it is...

convert list to string:
 L = [1,2,3] L = [str(x) for x in L] s = string.join(L,' ') print len(s)
convert list to a file
 myF = open(namaFile,w) for s in myList[:-1]: myF.write(str(s)+\n) myF.write(str(myList[len(myList)-1])) myF.close()

Cheers,
pujo
On 11/8/05, Mike Haft [EMAIL PROTECTED] wrote:
 
Hello,I've been working on a problem and have now sorted most of it (thanksto some help from the list). 
All the ways of writing data to a file I know keep telling me that listscan't be written to the file. I'm trying to convert data from one set offiles into files of a different format. But the easiest way to get the 
data from the first set of files is in a list(s).So, is there any way to convert lists to strings? Or a way to write liststo a file?ThanksMike___ 
Tutor maillist-Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
___
Tutor maillist  -  Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] lists and strings

[Shantanoo Mahajan]

+++ Hugo Gonz?lez Monteverde [08-11-05 13:13 -0600]:
| Hi Mike,
| 
| Converting an (almost)arbitrary object into a string is what the Pickle 
module does. CPickle is faster. Take 
| a look into into it in the docs.
| 

Is there a way to dump the varialble in XML format and retrive it?

e.g.
a=this is string
b=1234567890
c={}
c['a'] = a
c['b'] = b

and then dump c.

Regards,
Shantanoo


pgp5hG8KxTdBW.pgp
Description: PGP signature
___
Tutor maillist  -  Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] lists and strings

[Christopher Arndt]

Shantanoo Mahajan schrieb:
 +++ Hugo Gonz?lez Monteverde [08-11-05 13:13 -0600]:
 | Hi Mike,
 | 
 | Converting an (almost)arbitrary object into a string is what the Pickle 
 module does. CPickle is faster. Take 
 | a look into into it in the docs.
 | 
 
 Is there a way to dump the varialble in XML format and retrive it?

Look for xml_pickle.py in http://gnosis.cx/download/Gnosis_Utils-current.tar.gz

and see the article on it here:
http://gnosis.cx/publish/programming/xml_matters_1.txt

Also, xmlrpclib.py from the Standard library contains functions to serialize
basic Python data types to XML according to the XML-RPC specification.

Chris
___
Tutor maillist  -  Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor

Re: [Tutor] lists and strings

[Kent Johnson]

Mike Haft wrote:
 All the ways of writing data to a file I know keep telling me that lists
 can't be written to the file. I'm trying to convert data from one set of
 files into files of a different format. But the easiest way to get the
 data from the first set of files is in a list(s).
 
 So, is there any way to convert lists to strings? Or a way to write lists
 to a file?

What do you want the data to look like in the file? You can create a string 
from your list and write the string to the file. For example if the list 
contains strings and you just want to separate the values with spaces use 
join():

  data = ['22.5', '0.3', '11.9']
  ' '.join(data)
'22.5 0.3 11.9'

Or you could separate the values with comma and space:
  ', '.join(data)
'22.5, 0.3, 11.9'

I think from your previous post that your actual data is a list of lists, so 
you have to iterate the outside list, formatting each line and writing it to 
the file, something like this (borrowing from your previous unanswered post):

out_file = open(test.txt,w)
data = readSOMNETM(filename)
for line in data:
  line = ' '.join(line)
  out_file.write(line)
  out_file.write('\n')  # need a newline after each line
out_file.close()

Kent



-- 
http://www.kentsjohnson.com

___
Tutor maillist  -  Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor