[Tutor] Another parsing question

[Jay Mutter III]

I have the following that I am using to extract "numbers' from a file


prompt1 = raw_input('What is the file from which you would like a  
list of patent numbers?      ')
p1 = open(prompt1,'rU')
s = p1.readlines()
prompt2 = raw_input('What is the name of the file to which you would  
like to save the list of patent numbers?      ')
p2 = open(prompt2,'aU')
patno = re.compile(r'(\d{1})[\s,.]+(\d{3})[\s,.]+(\d{3})')
for line in s:
     jay = patno.findall(line)
     print jay

which yields the following

[('1', '337', '912')]
[('1', '354', '756')]
[('1', '360', '297')]
[('1', '328', '232')]
[('1', '330', '123')]
[('1', '362', '944')]
[('1', '350', '461')]
[('1', '355', '991')]
[('1', '349', '385')]
[('1', '350', '521')]
[('1', '336', '542')]
[('1', '354', '922')]
[('1', '338', '268')]
[('1', '353', '682')]
[('1', '343', '241')]
[('1', '359', '852')]
[('1', '342', '483')]
[('1', '347', '068')]
[('1', '331', '450')]

if i try to write to a file instead of print to the screen using
p2.write(jay)
i get the message

Traceback (most recent call last):
   File "patentno.py", line 12, in ?
     p2.write(jay)
TypeError: argument 1 must be string or read-only character buffer,  
not list

I f I try writelines i get

Traceback (most recent call last):
   File "patentno.py", line 12, in ?
     p2.writelines(jay)
TypeError: writelines() argument must be a sequence of strings
jay-mutter-iiis-computer:~/documents/programming/python/patents jlm1$


So what do i have above ? A list of tuples?

How do I  send the output to a file?
Is there a way to get the output as

1337912  instead of   [('1', '337', '912')]  ?

And as always thanks in advance for the help.

jay Mutter