我使用以下说明在Mac OS Lion上安装了预装的python 2.6上的numpy和scipy：
numpy and scipy for preinstalled python 2.6.7 on mac OS Lion
Numpy工作得很好;但是，对于from scipy.sparse import csr_matrix，我收到以下错误。我有什么需要做的来解决这个问题吗？
/Library/Python/2.6/site-packages/scipy/sparse/lil.py:21: RuntimeWarning: compiletime version 2.6 of module 'scipy.sparse._csparsetools' does not match runtime version 2.7
from . import _csparsetools
/Library/Python/2.6/site-packages/scipy/sparse/csgraph/__init__.py:150: RuntimeWarning: compiletime version 2.6 of module 'scipy.sparse.csgraph._shortest_path' does not match runtime version 2.7
from ._shortest_path import shortest_path, floyd_warshall, dijkstra,\
/Library/Python/2.6/site-packages/scipy/sparse/csgraph/_validation.py:5: RuntimeWarning: compiletime version 2.6 of module 'scipy.sparse.csgraph._tools' does not match runtime version 2.7
from ._tools import csgraph_to_dense, csgraph_from_dense,\
/Library/Python/2.6/site-packages/scipy/sparse/csgraph/__init__.py:152: RuntimeWarning: compiletime version 2.6 of module 'scipy.sparse.csgraph._traversal' does not match runtime version 2.7
from ._traversal import breadth_first_order, depth_first_order, \
/Library/Python/2.6/site-packages/scipy/sparse/csgraph/__init__.py:154: RuntimeWarning: compiletime version 2.6 of module 'scipy.sparse.csgraph._min_spanning_tree' does not match runtime version 2.7
from ._min_spanning_tree import minimum_spanning_tree
/Library/Python/2.6/site-packages/scipy/sparse/csgraph/__init__.py:155: RuntimeWarning: compiletime version 2.6 of module 'scipy.sparse.csgraph._reordering' does not match runtime version 2.7
from ._reordering import reverse_cuthill_mckee, maximum_bipartite_matching