在 Mac OS X 10.9 上使用 IPython 无法导入 sympy 和 scipy。尝试在 Mac 终端使用 IPython 导入这两个库，但遇到了如下错误：
In [3]: import sympy
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-3-7fb0c7cf9177> in <module>()
----> 1 import sympy
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/sympy/__init__.py in <module>()
68 # This module is slow to import:
69 #from physics import units
---> 70 from plotting import plot, Plot, textplot, plot_backends, plot_implicit
71 from printing import pretty, pretty_print, pprint, pprint_use_unicode, \
72 pprint_try_use_unicode, print_gtk, print_tree, pager_print, TableForm
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/sympy/plotting/__init__.py in <module>()
----> 1 from plot import plot_backends
2 from plot_implicit import plot_implicit
3 from proxy_pyglet import Plot
4 from textplot import textplot
5 from pygletplot import PygletPlot
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/sympy/plotting/plot.py in <module>()
29 from sympy.core.compatibility import set_union
30 import warnings
---> 31 from experimental_lambdify import (vectorized_lambdify, lambdify)
32
33 #TODO probably all of the imports after this line can be put inside function to
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/sympy/plotting/experimental_lambdify.py in <module>()
71
72 from sympy.external import import_module
---> 73 np = import_module('numpy')
74 import warnings
75
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/sympy/external/importtools.py in import_module(module, min_module_version, min_python_version, warn_not_installed, warn_old_version, module_version_attr, module_version_attr_call_args, __import__kwargs, catch)
121
122 try:
--> 123 mod = __import__(module, **__import__kwargs)
124 except ImportError:
125 if warn_not_installed:
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/numpy/__init__.py in <module>()
141 return loader(*packages, **options)
142
--> 143 import add_newdocs
144 __all__ = ['add_newdocs']
145
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/numpy/add_newdocs.py in <module>()
7 # core/fromnumeric.py, core/defmatrix.py up-to-date.
8
----> 9 from numpy.lib import add_newdoc
10
11 ###############################################################################
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/numpy/lib/__init__.py in <module>()
11
12 import scimath as emath
---> 13 from polynomial import *
14 #import convertcode
15 from utils import *
/Users/nick/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/numpy/lib/polynomial.py in <module>()
9 import re
10 import warnings
---> 11 import numpy.core.numeric as NX
12
13 from numpy.core import isscalar, abs, finfo, atleast_1d, hstack, dot
AttributeError: 'module' object has no attribute 'core'
- 解决方案
为了解决这个问题，需要确保 NumPy 已正确安装。可以通过以下步骤进行安装：
pip install numpy
如果 NumPy 已安装，可以尝试以下方法：
import sys
sys.path.append('/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/')
这将把 NumPy 的安装路径添加到 Python 的搜索路径中。
然后，就可以在 IPython 中导入 sympy 和 scipy：
import sympy
import scipy
