Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1581 by ondrej.certik: subs(dict()) sometimes breaks
http://code.google.com/p/sympy/issues/detail?id=1581
In [1]: N = 3
In [2]: (1 + x).subs(dict(N=3))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (24, 0))
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/home/ondrej/repos/sympy/<ipython console> in <module>()
/home/ondrej/repos/sympy/sympy/core/basic.pyc in subs(self, *args)
1021 sequence = args[0]
1022 if isinstance(sequence, dict):
-> 1023 return self._subs_dict(sequence)
1024 elif isinstance(sequence, (list, tuple)):
1025 return self._subs_list(sequence)
/home/ondrej/repos/sympy/sympy/core/basic.pyc in _subs_dict(self, sequence)
1111 subst.append(pattern)
1112 subst.reverse()
-> 1113 return self._subs_list(subst)
1114
1115 def _seq_subs(self, old, new):
/home/ondrej/repos/sympy/sympy/core/basic.pyc in _subs_list(self, sequence)
1064 for old, new in sequence:
1065 if hasattr(result, 'subs'):
-> 1066 result = result.subs(old, new)
1067 return result
1068
/home/ondrej/repos/sympy/sympy/core/basic.pyc in subs(self, *args)
1028 elif len(args) == 2:
1029 old, new = args
-> 1030 return self._subs_old_new(old, new)
1031 else:
1032 raise TypeError("subs accepts either 1 or 2 arguments")
/home/ondrej/repos/sympy/sympy/core/cache.pyc in wrapper(*args, **kw_args)
83 except KeyError:
84 pass
---> 85 func_cache_it_cache[k] = r = func(*args, **kw_args)
86 return r
87
/home/ondrej/repos/sympy/sympy/core/basic.pyc in _subs_old_new(self, old,
new)
1037 old = sympify(old)
1038 new = sympify(new)
-> 1039 return self._eval_subs(old, new)
1040
1041 def _eval_subs(self, old, new):
/home/ondrej/repos/sympy/sympy/core/add.pyc in _eval_subs(self, old, new)
293 return self.__class__(*[s._eval_subs(old, new) for s in
self.args ])
294 coeff_self, factors_self = self.as_coeff_factors()
--> 295 coeff_old, factors_old = old.as_coeff_factors()
296 if factors_self == factors_old: # (2+a).subs(3+a,y) -> 2-3+y
297 return Add(new, coeff_self, -coeff_old)
AttributeError: 'function' object has no attribute 'as_coeff_factors'
but this works:
In [3]: (1 + x).subs({N: 3})
Out[3]: 1 + x
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