[Python-ideas] New 3.x restriction on number of keyword arguments

[Georg Brandl]

Am 21.10.2010 16:06, schrieb Benjamin Peterson:
> Raymond Hettinger <raymond.hettinger at ...> writes:
> 
>> 
>> One of the use cases for named tuples is to have them be automatically created
> from a SQL query or CSV header. 
>> Sometimes (but not often), those can have a huge number of columns.  In Python
> 2.x, it worked just fine -- we
>> had a test for a named tuple with 5000 fields.  In Python 3.x, there is a
> SyntaxError when there are more than
>> 255 fields.
> 
> I'm not sure why you think this is new. It's been true from at least 2.5 as far
> as I can see.

You must be talking of a different restriction.  This snippet works fine in
2.7, but raises a SyntaxError in 3.1:

   exec("def f(" + ", ".join("a%d" % i for i in range(1000)) + "): pass")

Georg

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