Help to convert Number to String

Stefan Schwarzer sschwarzer at
Sat Aug 14 01:27:24 CEST 2010

Hi Vamsi,

On 2010-08-13 22:50, Vamsi wrote:
> I am trying to count the number of lines in a file and insert  into
> the file but getting the error message "TypeError: must be string or
> read-only character buffer, not int", Could you please help me how to
> correct this?

Which Python version do you use?

For which statement exactly do you get the message?

> here is the code
> lines1 = sum(1 for line in open('C:/test1.txt'))
> wfile = open('C:/test1.txt'', 'a')

You have two quotes here after the filename. These give a
SyntaxError here. Python sees two concatenated strings,
"C:/test1.txt" and ", " and stumbles over the a immediately
after the closing quote of the second string.

> wfile.write(str(lines1).zfill(9))
> wfile.close()

If I remove the redundant quote character and substitute
filenames appropriate for my system, everything works.

Maybe the code you included in this post isn't the same
which led to the error?


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