Python3.0 has more duplication in source code than Python2.5

Terry terry.yinzhe at
Sun Feb 8 02:12:46 CET 2009

On 2月8日, 上午8时51分, Terry <terry.yin... at> wrote:
> On 2月8日, 上午12时20分, Benjamin Peterson <benja... at> wrote:
> > Terry <terry.yinzhe <at>> writes:
> > > On 2月7日, 下午7时10分, "Diez B. Roggisch" <de... at> wrote:
> > > > Do you by any chance have a few examples of these? There is a lot of
> > > > idiomatic code in python to e.g. acquire and release the GIL or doing
> > > > refcount-stuff. If that happens to be done with rather generic names as
> > > > arguments, I can well imagine that as being the cause.
> > > Starting at line 5119 of D:\DOWNLOADS\Python-3.0\Python\Python-ast.c
> > This isn't really fair because Python-ast.c is auto generated. ;)
> Oops! I don't know that! Then the analysis will not be valid, since
> too many duplications are from there.


I have to say sorry because I found I made a mistake. Because Python-
ast.c is auto-generated and shouldn't be counted here, the right
duplication rate of Python3.0 is very small (5%).
And I found the duplications are quite trivial, I wound not say that
all of them are acceptable, but certainly not a strong enough evident
for code quality.

I have made the same analysis to some commercial source code, the
dup60 rate is quite often significantly larger than 15%.

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