[Python-Dev] csv changed from python 2.4 to 2.5 (original) (raw)

Nick Craig-Wood nick at craig-wood.com
Wed Jun 27 12:50:41 CEST 2007

Christian K <ckkart at hoc.net> wrote:

I could not find documentation of the following change in python2.5. What is the reason for that?

Python 2.4.4 (#2, Apr 12 2007, 21:03:11) [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import csv >>> d=csv.getdialect('excel') >>> d.delimiter = ',' >>> ck at kiste:/media/hda6/home/ck/prog/peak-o-mat/trunk$ python2.5 Python 2.5.1 (r251:54863, May 2 2007, 16:56:35) [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import csv >>> d=csv.getdialect('excel') >>> d.delimiter = ',' Traceback (most recent call last): File "", line 1, in TypeError: readonly attribute >>>

Looks like this is the reason - the get_dialect call (which is implemented in C) is now returning a read only Dialect object rather than an instance of the original class :-

2.5 >>> import csv >>> d = csv.get_dialect('excel') >>> d.class <type '_csv.Dialect'> >>>

2.4 >>> import csv >>> d = csv.get_dialect('excel') >>> d.class <class csv.excel at 0xb7d1f74c> >>>

Python 2.5.1 (r251:54863, May 2 2007, 16:56:35) [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import csv >>> d = csv.excel >>> d.delimiter = ',' >>>

Don't you want to do this anyway?

import csv class my_dialect(csv.excel): delimeter = ","

-- Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick

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