【发布时间】：2020-08-20 04:01:49
【问题描述】：
所以，我从这里安装了 Octave 符号包：
https://sourceforge.net/p/octave/symbolic/ci/master/tree/
在 Octave 命令窗口中我输入了：
pkg install -forge symbolic
安装后我运行了一个测试（如上面的链接所示），输入：
pkg load symbolic
syms x
但是，syms x 出现以下错误。
Symbolic pkg v2.8.0: Traceback (most recent call last):
File "<string>", line 1, in <module>
ImportError: No module named sympy
error: Python cannot import SymPy: have you installed SymPy?
Try "sympref diagnose" for more information.
error: called from
assert_have_python_and_sympy at line 123 column 7
python_ipc_popen2 at line 79 column 5
python_ipc_driver at line 59 column 13
python_cmd at line 163 column 9
valid_sym_assumptions at line 38 column 10
assumptions at line 82 column 7
syms at line 97 column 13
接下来，我访问了以下站点来安装 SymPy（上面说要安装 Anaconda）。
https://docs.sympy.org/latest/install.html#anaconda
那么，我去以下站点下载macOS的图形安装程序（Python 2.7版本）。
https://www.anaconda.com/distribution/#download-section
然后我从 macOS 终端测试，看看是否使用此命令安装了 Anaconda
conda --version
返回conda 4.7.11。
我也输入了
conda list
返回（在一个长列表中）。 sympy 1.4 py27_0.
因此，SymPy 似乎已安装（至少在终端上）。
接下来，我回到 Octave 的命令行并输入：
sympref diagnose
这是输出：
Symbolic package diagnostics
============================
Python and SymPy are needed for most features of the Symbolic package.
The Python interpreter is currently: "python".
Computers may have more than one Python interpreter installed. If you
need to, you can select a different one using the PYTHON environment
variable (see "help sympref"). For example, to use Python 3, try
setenv PYTHON python3
sympref reset
Attempting to run python -c "print(\"Python says hello\")"
status = 0
output = Python says hello
Good, Python ran correctly.
Python version
--------------
Let's check what version of Python we are calling...
Attempting to run python -c "import sys; print(sys.version)"
status = 0
output = 2.7.15 (default, Feb 5 2019, 12:31:36)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)]
SymPy Python Library
--------------------
SymPy is a Python library used by Symbolic for almost all features.
Attempting to run python -c "import sympy; print(sympy.__version__)"
Traceback (most recent call last):
File "<string>", line 1, in <module>
ImportError: No module named sympy
status = 1
output =
Unfortunately status was non-zero: probably Python cannot import sympy.
* Is there an error message above?
* Do you have SymPy installed? If not, please try to install it and
try again.
* If you do have SymPy installed, maybe it's installed for a different
Python interpreter than the one we found? Please try "setenv" as
described above to change your python interpreter.
Octave 无权访问 SymPy。
知道我做错了什么吗？
【问题讨论】：