此代码
from sympy import symbols
from sympy.utilities.autowrap import ufuncify
a = symbols(r'\alpha')
phi = a**2
phi_f = ufuncify(a, phi)
抛出下面的错误，这些错误显然来自Python / C代码中的\alpha。遗憾的是，将\alpha替换为a作为Sympy符号是非常重要的，因为在我的实际代码库中，此代码是较大程序的一部分，该程序也会显示/写出很多LaTeX输出。
---------------------------------------------------------------------------
CalledProcessError Traceback (most recent call last)
/home/ma/apps/anaconda3/lib/python3.5/site-packages/sympy/utilities/autowrap.py in _process_files(self, routine)
162 try:
--> 163 retoutput = check_output(command, stderr=STDOUT)
164 except CalledProcessError as e:
/home/ma/apps/anaconda3/lib/python3.5/subprocess.py in check_output(timeout, *popenargs, **kwargs)
625 return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
--> 626 **kwargs).stdout
627
/home/ma/apps/anaconda3/lib/python3.5/subprocess.py in run(input, timeout, check, *popenargs, **kwargs)
707 raise CalledProcessError(retcode, process.args,
--> 708 output=stdout, stderr=stderr)
709 return CompletedProcess(process.args, retcode, stdout, stderr)
CalledProcessError: Command '['/home/ma/apps/anaconda3/bin/python', 'setup.py', 'build_ext', '--inplace']' returned non-zero exit status 1
During handling of the above exception, another exception occurred:
CodeWrapError Traceback (most recent call last)
<ipython-input-66-17455e4d65ae> in <module>()
4 a = symbols(r'\alpha')
5 phi = a**2
----> 6 phi_f = ufuncify(a, phi)
/home/ma/apps/anaconda3/lib/python3.5/site-packages/sympy/utilities/autowrap.py in ufuncify(args, expr, language, backend, tempdir, flags, verbose, helpers)
886 code_wrapper = UfuncifyCodeWrapper(CCodeGen("ufuncify"), tempdir,
887 flags, verbose)
--> 888 return code_wrapper.wrap_code(routine, helpers=helps)
889 else:
890 # Dummies are used for all added expressions to prevent name clashes
/home/ma/apps/anaconda3/lib/python3.5/site-packages/sympy/utilities/autowrap.py in wrap_code(self, routine, helpers)
142 self._generate_code(routine, helpers)
143 self._prepare_files(routine)
--> 144 self._process_files(routine)
145 mod = __import__(self.module_name)
146 finally:
/home/ma/apps/anaconda3/lib/python3.5/site-packages/sympy/utilities/autowrap.py in _process_files(self, routine)
165 raise CodeWrapError(
166 "Error while executing command: %s. Command output is:\n%s" % (
--> 167 " ".join(command), e.output.decode()))
168 if not self.quiet:
169 print(retoutput)
CodeWrapError: Error while executing command: /home/ma/apps/anaconda3/bin/python setup.py build_ext --inplace. Command output is:
running build_ext
running build_src
build_src
building extension "wrapper_module_3" sources
build_src: building npy-pkg config files
customize UnixCCompiler
customize UnixCCompiler using build_ext
building 'wrapper_module_3' extension
compiling C sources
C compiler: gcc -pthread -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC
creating build
creating build/temp.linux-x86_64-3.5
compile options: '-I/home/ma/apps/anaconda3/lib/python3.5/site-packages/numpy/core/include -I/home/ma/apps/anaconda3/include/python3.5m -c'
gcc: wrapper_module_3.c
In file included from /home/ma/apps/anaconda3/lib/python3.5/site-packages/numpy/core/include/numpy/ndarraytypes.h:1777:0,
from wrapper_module_3.c:3:
/home/ma/apps/anaconda3/lib/python3.5/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: #warning "Using deprecated NumPy API, disable it by " "#defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-Wcpp]
#warning "Using deprecated NumPy API, disable it by " \
^
In file included from wrapper_module_3.c:6:0:
wrapped_code_3.h:3:1: error: stray ‘\’ in program
double autofunc(double \alpha);
^
In file included from /home/ma/apps/anaconda3/lib/python3.5/site-packages/numpy/core/include/numpy/ndarraytypes.h:1777:0,
from wrapper_module_3.c:3:
/home/ma/apps/anaconda3/lib/python3.5/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: #warning "Using deprecated NumPy API, disable it by " "#defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-Wcpp]
#warning "Using deprecated NumPy API, disable it by " \
^
In file included from wrapper_module_3.c:6:0:
wrapped_code_3.h:3:1: error: stray â\â in program
double autofunc(double \alpha);
^
error: Command "gcc -pthread -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/home/ma/apps/anaconda3/lib/python3.5/site-packages/numpy/core/include -I/home/ma/apps/anaconda3/include/python3.5m -c wrapper_module_3.c -o build/temp.linux-x86_64-3.5/wrapper_module_3.o" failed with exit status 1
答案 0 :(得分：2)
您可能需要跳过\，因为sympy.latex会自动添加from sympy import symbols
from sympy.utilities.autowrap import ufuncify
import sympy
a = symbols('alpha')
phi = a**2
phi_f = ufuncify(a, phi)
print(sympy.latex(phi))
# \alpha^{2}
：
{{1}}