Hi,
I had some trouble debugging a traceback that I got from Cython, which
ended up being a simple typo in a .pyx file. Below is a reduced example of
this problem.
If you have a foo.pxd file (specifying a variable "bar"):
$ cat foo.pxd
cdef class Tree:
cpdef build(self, int bar=*)
And a foo.pyx file (accidentally calling the variable "baz"):
$ cat foo.pyx
cdef class Tree:
cpdef build(self, int baz=None):
print baz
You get this nasty traceback when you try to cython it, which makes you
think there is a bug in Cython instead of a bug in your code:
$ cython foo.pyx
Traceback (most recent call last):
File "/usr/local/bin/cython", line 9, in <module>
load_entry_point('Cython==0.19.1', 'console_scripts', 'cython')()
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Main.py", line 618, in
setuptools_main
return main(command_line = 1)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Main.py", line 635, in
main
result = compile(sources, options)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Main.py", line 610, in
compile
return compile_multiple(source, options)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Main.py", line 579, in
compile_multiple
result = run_pipeline(source, options, context=context)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Main.py", line 425, in
run_pipeline
err, enddata = Pipeline.run_pipeline(pipeline, source)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Pipeline.py", line 322,
in run_pipeline
data = phase(data)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Pipeline.py", line 51,
in generate_pyx_code_stage
module_node.process_implementation(options, result)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/ModuleNode.py", line
111, in process_implementation
self.generate_c_code(env, options, result)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/ModuleNode.py", line
342, in generate_c_code
self.body.generate_function_definitions(env, code)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Nodes.py", line 393, in
generate_function_definitions
stat.generate_function_definitions(env, code)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Nodes.py", line 4267,
in generate_function_definitions
self.body.generate_function_definitions(self.scope, code)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Nodes.py", line 393, in
generate_function_definitions
stat.generate_function_definitions(env, code)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Nodes.py", line 1704,
in generate_function_definitions
self.generate_argument_parsing_code(env, code)
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/Nodes.py", line 2297,
in generate_argument_parsing_code
self.type.opt_arg_cname(declarator.name)))
File "/Library/Python/2.7/site-packages/Cython
-0.19.1-py2.7-macosx-10.8-intel.egg/Cython/Compiler/PyrexTypes.py", line
2684, in opt_arg_cname
return self.op_arg_struct.base_type.scope.lookup(arg_name).cname
AttributeError: 'NoneType' object has no attribute 'cname'
Thanks,
John.
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