[reportlab-users] io.StringIO vs cStringIO.StringIO

Michael Hipp michael at redmule.com
Tue Oct 11 15:49:09 EDT 2011

It appears the 'cStringIO' module is being depreciated in favor of the 'io'
module going forward to Py3.

In Py2.7, this works:
from cStringIO import StringIO
out = StringIO() # write it to a memory buffer
doc = SimpleDocTemplate(out, ...)

But this doesn't:
from io import StringIO

I thought the io.StringIO was a drop-in replacement, but it gives this exception:

TypeError: string argument expected, got 'str'
File "C:\Python27\Lib\site-packages\reportlab\pdfbase\pdfdoc.py", line 235, in

The thing returned by self.GetPDFData(canvas) is indeed of type 'str' but the
io.StringIO object doesn't seem to like it. Any ideas?

Reportlab 2.5, Win7x32, Py2.7.

Michael Hipp

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