在编译扩展types时validation兼容性，并在cdef中使用它们

常问问题：

• 为什么在Cython编译中的其他错误指向特定的错误行，而这不是？

在更新之前：

由于难以编译扩展types，如下面的'will not compile'链接所引用的，认为AssertionError与扩展types相关（在其实例化被转移到主pyx文件之后）。

有人从这个论坛发帖说：“如果你真的想要扩展types，并希望在你的代码中声明他们的types，你需要在.pxd文件中声明他们的C属性。

如果在这种情况下是这样的话，问题是在使用pxd文件时，pyx文件将不能编译 。 在一个pyx文件中编译扩展types时没有错误，但是接收到错误extTypeName is not a type identifier在导入后使用扩展types时extTypeName is not a type identifier 。

我在评论中被告知，扩展types可以在pyx文件中用主函数使用它们来定义。 这样做，我收到一个错误，我不知道如何跟踪（ AssertionError: unexpected type int and base type tuple object for indexing ）。 完整的追溯在下面发布。

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很难追查错误

当试图用在同一个pyx文件中声明的扩展types进行编译时的追溯（我不知道是什么原因）：

 Traceback (most recent call last): File "setup.py", line 37, in <module> ext_modules = [Extension("HintToCRdict", ["HintToCRdict.pyx"])] File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 151, in setup dist.run_commands() File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 953, in run_commands self.run_command(cmd) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 972, in run_command cmd_obj.run() File "/Library/Python/2.7/site-packages/Cython/Distutils/build_ext.py", line 164, in run _build_ext.build_ext.run(self) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/command/build_ext.py", line 337, in run self.build_extensions() File "/Library/Python/2.7/site-packages/Cython/Distutils/build_ext.py", line 171, in build_extensions ext.sources = self.cython_sources(ext.sources, ext) File "/Library/Python/2.7/site-packages/Cython/Distutils/build_ext.py", line 324, in cython_sources full_module_name=module_name) File "/Library/Python/2.7/site-packages/Cython/Compiler/Main.py", line 688, in compile return compile_single(source, options, full_module_name) File "/Library/Python/2.7/site-packages/Cython/Compiler/Main.py", line 638, in compile_single return run_pipeline(source, options, full_module_name) File "/Library/Python/2.7/site-packages/Cython/Compiler/Main.py", line 495, in run_pipeline err, enddata = Pipeline.run_pipeline(pipeline, source) File "/Library/Python/2.7/site-packages/Cython/Compiler/Pipeline.py", line 365, in run_pipeline data = phase(data) File "/Library/Python/2.7/site-packages/Cython/Compiler/Pipeline.py", line 53, in generate_pyx_code_stage module_node.process_implementation(options, result) File "/Library/Python/2.7/site-packages/Cython/Compiler/ModuleNode.py", line 131, in process_implementation self.generate_c_code(env, options, result) File "/Library/Python/2.7/site-packages/Cython/Compiler/ModuleNode.py", line 359, in generate_c_code self.body.generate_function_definitions(env, code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 435, in generate_function_definitions stat.generate_function_definitions(env, code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 1944, in generate_function_definitions self.generate_function_body(env, code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 1698, in generate_function_body self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 5851, in generate_execution_code if_clause.generate_execution_code(code, end_label, is_last=i == last) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 5894, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/UtilNodes.py", line 321, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 6402, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/UtilNodes.py", line 321, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 6402, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 5851, in generate_execution_code if_clause.generate_execution_code(code, end_label, is_last=i == last) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 5894, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/UtilNodes.py", line 89, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 6015, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 6192, in generate_execution_code self.body.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 441, in generate_execution_code stat.generate_execution_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 4786, in generate_execution_code self.generate_rhs_evaluation_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/Nodes.py", line 5073, in generate_rhs_evaluation_code self.rhs.generate_evaluation_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/ExprNodes.py", line 699, in generate_evaluation_code self.generate_subexpr_evaluation_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/ExprNodes.py", line 714, in generate_subexpr_evaluation_code node.generate_evaluation_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/ExprNodes.py", line 699, in generate_evaluation_code self.generate_subexpr_evaluation_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/ExprNodes.py", line 714, in generate_subexpr_evaluation_code node.generate_evaluation_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/ExprNodes.py", line 705, in generate_evaluation_code self.generate_result_code(code) File "/Library/Python/2.7/site-packages/Cython/Compiler/ExprNodes.py", line 3737, in generate_result_code self.type, self.base.type) AssertionError: unexpected type int and base type tuple object for indexing 

Answer 1

我可以从你的信息中得到答复。

1. 在Cython中使用Python对象是可能的，但是一旦你cdef某些部分，就会受到限制。 尝试通过“un” – 制定字典。
2. 你有错误表明你有一个expression式是x[y] ，其中x是一个元组， y是一个int。 原则上它应该工作正常（用int int索引一个元组就可以）。 所以你可以看看Cython中的方括号来找出它来自哪里。
3. 你提到已经删除了pxd文件。 你有没有把扩展类/其他types定义的完整声明移动到pyx文件？

Answer 2

扩展types在编译时不是问题（至less在与主cdef函数相同的pyx文件中声明时）。 错误在其他地方出现。

解决 ：

1. AssertionError是由对这个元组的简单索引访问引起的。

一个元组被声明为：

 cdef: tuple curIRs 

…并在嵌套循环中设置为：

 for deriv1 in xrange(len(L1)): for deriv2 in xrange(len(L2)): curIRs = (deriv2, deriv1) 

…和元组索引被访问：

 d1[ix] = (curIRs[0], curIRs[1]) 

curIRs不仅仅是存储，而是通过索引访问实质上复制，这显然是无害的疏忽。 但是，这是错误发生的原因，原因不明：

当（curIRs [0]，curIRs [1]）被curIRreplace时， AssertionError停止。

2. 正如注释中所述，pyx文件中的主函数不能用cdef定义，因为它是在python脚本中调用的。

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Pierre de Buyl在评论中的build议非常有帮助：“删除潜在问题variables的cdef声明，直到错误得到解决。 即在Python中可能没有错误的地方，Cython中可能会发现一个不兼容的地方