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diff --git a/engine/SCons/compat/_scons_itertools.py b/engine/SCons/compat/_scons_itertools.py
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-#
-# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be included
-# in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
-# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-#
-
-__revision__ = "src/engine/SCons/compat/_scons_itertools.py 4720 2010/03/24 03:14:11 jars"
-
-__doc__ = """
-Implementations of itertools functions for Python versions that don't
-have iterators.
-
-These implement the functions by creating the entire list, not returning
-it element-by-element as the real itertools functions do. This means
-that early Python versions won't get the performance benefit of using
-the itertools, but we can still use them so the later Python versions
-do get the advantages of using iterators.
-
-Because we return the entire list, we intentionally do not implement the
-itertools functions that "return" infinitely-long lists: the count(),
-cycle() and repeat() functions. Other functions below have remained
-unimplemented simply because they aren't being used (yet) and it wasn't
-obvious how to do it. Or, conversely, we only implemented those functions
-that *were* easy to implement (mostly because the Python documentation
-contained examples of equivalent code).
-
-Note that these do not have independent unit tests, so it's possible
-that there are bugs.
-"""
-
-def chain(*iterables):
- result = []
- for x in iterables:
- result.extend(list(x))
- return result
-
-def count(n=0):
- # returns infinite length, should not be supported
- raise NotImplementedError
-
-def cycle(iterable):
- # returns infinite length, should not be supported
- raise NotImplementedError
-
-def dropwhile(predicate, iterable):
- result = []
- for x in iterable:
- if not predicate(x):
- result.append(x)
- break
- result.extend(iterable)
- return result
-
-def groupby(iterable, *args):
- raise NotImplementedError
-
-def ifilter(predicate, iterable):
- result = []
- if predicate is None:
- predicate = bool
- for x in iterable:
- if predicate(x):
- result.append(x)
- return result
-
-def ifilterfalse(predicate, iterable):
- result = []
- if predicate is None:
- predicate = bool
- for x in iterable:
- if not predicate(x):
- result.append(x)
- return result
-
-def imap(function, *iterables):
- return apply(map, (function,) + tuple(iterables))
-
-def islice(*args, **kw):
- raise NotImplementedError
-
-def izip(*iterables):
- return apply(zip, iterables)
-
-def repeat(*args, **kw):
- # returns infinite length, should not be supported
- raise NotImplementedError
-
-def starmap(*args, **kw):
- raise NotImplementedError
-
-def takewhile(predicate, iterable):
- result = []
- for x in iterable:
- if predicate(x):
- result.append(x)
- else:
- break
- return result
-
-def tee(*args, **kw):
- raise NotImplementedError
-
-# Local Variables:
-# tab-width:4
-# indent-tabs-mode:nil
-# End:
-# vim: set expandtab tabstop=4 shiftwidth=4: