我已经安装（在 Windows 机器上（Win7 64 位））：
- python 3.5.0 和 sympy 0.7.6.1
- 八度音程 4.0.0.0 和符号 2.2.2
当我尝试使用多个操作员做任何事情时，这就是我得到的：
>> pkg load symbolic
>> syms x
OctSymPy v2.2.2: this is free software without warranty, see source.
Initializing communication with SymPy using a popen2() pipe.
Detected Windows: using "winwrapy.bat" to workaround Octave bug #43036
Some output from the Python subprocess (pid 28092) might appear next.
OctSymPy: Communication established. SymPy v0.7.6.1.
Python 3.5.0 (v3.5.0:374f501f4567, Sep 13 2015, 02:16:59) [MSC v.1900 32 bit (Int
el)]
>> x^2
ans = (sym)
2
x
>> x^2 + 2*x + 1
PYTHON: Error in var export
Resetting the octsympy communication mechanism
Closing the Python pipe...
error: python_cmd: unexpected return
error: called from
python_cmd at line 143 column 6
mtimes at line 42 column 5
>>
怎么了？