On Tue, Sep 15, 2009 at 10:53 AM, Mariah Lenox <mariah.le...@gmail.com> wrote:
>
> Perhaps I do not understand sxrange / xsrange correctly. The
> reference manual entries for them seem to be similar. Is
> there a difference? (If one is just an alias for the other,
> it would be best to say so. If they are different, the reference
> manual needs to emphasize the difference.)
The file misc.py has this line:
sxrange = xsrange
Any chance you could post a patch with a statement that they are
aliases added to the docs?
>
> Also the reference manual entry for
>
> sage.misc.misc.sxrange
>
> has the note
>
> : This function is called xsrange to distinguish it from the builtin
> Python xrange command.
>
> Should it say "sxrange" rather than "xsrange"?
>
> Finally here is my attempt to use sxrange (xsrange
> gives similar output):
>
> e = 1
> while true:
> print Integer(10^e)
> for i in sxrange(Integer(2),Integer(10^e)):
> if i == 3:
> break
> e += 1
>
> gives
>
> 10
> 100
> 1000
> 10000
> 100000
> 1000000
> 10000000
> 100000000
> 1000000000
> 10000000000
> 100000000000
> 1000000000000
> 10000000000000
> 100000000000000
> 1000000000000000
> 10000000000000000
> 100000000000000000
> 1000000000000000000
> 10000000000000000000
> Traceback (most recent call last):
> File "zzzbug.py", line 7, in <module>
> for i in sxrange(Integer(_sage_const_2 ),Integer(_sage_const_10 **e)):
> File
> "/home/mariah/sage/sage-4.1.1-x86_64-Linux-core2-fc/local/lib/python2.6/site-packages/sage/misc/misc.py",
> line 1059, in generic_xsrange
> for k in xrange(icount):
> OverflowError: long int too large to convert to int
>
> I really want an iterator for the "for i in ..." loop.
>
> Is this a bug?
Yes, I think that is a bug given the point of xrange, caused by an optimization.
> Is there a better way to do what I want?
Here is a way to do what you want:
e = 1
while true:
print Integer(10^e)
i = Integer(2)
while i < Integer(10^e):
if i == 3:
break
print type(i)
i += 1
e += 1
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