Hi all,
  I'm fairly new to sage and have been developing some tools for
arithmetic dynamics over projective and affine spaces this semester. I
met william stein last week and am starting to get actually set-up to
get involved in Sage.  First things first is to post the (potential)
bugs I've come across.  There will be 4 in total.

Here is the first and most minor. I know there is a new function for
this, but this still produces an error. This is potentially a user
problem, but I thought I'd post it as I couldn't find a discussion of
it.

'Sage Version 4.8, Release Date: 2012-01-20' on Ubuntu 11.10

K.<t>=GF(13)
is_PrimeField(K)

__main__:1: DeprecationWarning:
Using is_PrimeField from the top level is deprecated since it was
designed to be used by developers rather than end users.
It most likely does not do what you would expect it to do.  If you
really need to use it, import it from the module that it is defined
in.
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "_sage_input_25.py", line 10, in <module>
    exec compile(u'open("___code___.py","w").write("# -*- coding:
utf-8 -*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("Sy48dD49R0YoMTMpCmlzX1ByaW1lRmllbGQoSyk="),globals())
+"\\n"); execfile(os.path.abspath("___code___.py"))
  File "", line 1, in <module>

  File "/tmp/tmp1oEtRy/___code___.py", line 4, in <module>
    exec compile(u'is_PrimeField(K)
  File "", line 1, in <module>

  File "/home/ben/sage-4.8/local/lib/python2.6/site-packages/sage/misc/
misc.py", line 2412, in wrapper
    return func(*args, **kwds)
  File "/home/ben/sage-4.8/local/lib/python2.6/site-packages/sage/
rings/field.py", line 23, in is_PrimeField
    from finite_field.constructor import is_FiniteField
ImportError: No module named finite_field.constructor

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