如何禁用包含LaTeX符號的函數？

此代碼如何禁用包含LaTeX符號的函數？

from sympy import symbols 
from sympy.utilities.autowrap import ufuncify 
a = symbols(r'\alpha') 
phi = a**2 
phi_f = ufuncify(a, phi)

引發下面的錯誤，這顯然從在Python/C代碼\alpha到來。不幸的是，將\alpha替換爲a作爲Sympy符號並不重要，因爲在我的實際代碼庫中，此代碼是顯示/寫出大量LaTeX輸出的較大程序的一部分。

--------------------------------------------------------------------------- 
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

來源

2016-11-19 Michael A

也許你只需要跳過\因爲它會通過sympy.latex自動添加：

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}

來源

2016-11-19 21:34:05

如何禁用包含LaTeX符號的函數？

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