我刚刚在我的c++嵌入式python编辑器中添加了子解释器,以便每次执行都有一个干净的解释器。
PyThreadState* tmpstate = Py_NewInterpreter();
PyThreadState_Swap(tmpstate);
... run the script ...
Py_EndInterpreter(tmpstate);
我自己的模块正在工作,我测试numpy没有任何问题。问题在于matplotlib
如果我第一次运行,一切看起来都很好。第二次我得到:
<class 'TypeError'>: attribute of type 'NoneType' is not callable: File "<string>", line 1, in <module>
File "C:Python33libsite-packagespylab.py", line 1, in <module>
from matplotlib.pylab import *
File "C:Python33libsite-packagesmatplotlib__init__.py", line 152, in <module>
from matplotlib.rcsetup import (defaultParams,
File "C:Python33libsite-packagesmatplotlibrcsetup.py", line 19, in <module>
from matplotlib.fontconfig_pattern import parse_fontconfig_pattern
File "C:Python33libsite-packagesmatplotlibfontconfig_pattern.py", line 25, in <module>
from matplotlib.pyparsing_py3 import Literal, ZeroOrMore,
File "C:Python33libsite-packagesmatplotlibpyparsing_py3.py", line 3275, in <module>
_escapedHexChar = Combine( Suppress(_bslash + "0x") + Word(hexnums) ).setParseAction(lambda s,l,t:unichr(int(t[0],16)))
File "C:Python33libsite-packagesmatplotlibpyparsing_py3.py", line 2961, in __init__
self.leaveWhitespace()
File "C:Python33libsite-packagesmatplotlibpyparsing_py3.py", line 2587, in leaveWhitespace
self.expr = self.expr.copy()
File "C:Python33libsite-packagesmatplotlibpyparsing_py3.py", line 705, in copy
cpy = copy.copy( self )
File "C:Python33libcopy.py", line 89, in copy
rv = reductor(2)
这似乎是Python 3.3中的一个错误:http://bugs.python.org/issue17408
问题是:
The reason is in Objects/typeobject.c: import_copyreg() has a static cache of the copyreg module.
When the interpreter stops, the module is filled with None... but gets reused in the next instance.
Resetting this "mod_copyreg" variable to NULL fixes the issue.
pickle is also broken for the same reason.