Updates:
Status: Fixed
Comment #3 on issue 2300 by smi...@gmail.com: x.diff(4) doesn't fail
http://code.google.com/p/sympy/issues/detail?id=2300
>>> x.diff(4)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\core\expr.py", line 1653, in diff
return Derivative(self, *new_symbols, **assumptions)
File "sympy\core\function.py", line 622, in __new__
raise ValueError('Derivative expects Symbol [, Integer] args but
got %s, %s'
% (s, count))
ValueError: Derivative expects Symbol [, Integer] args but got 4, 1
>>> x.diff(2*x)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\core\expr.py", line 1653, in diff
return Derivative(self, *new_symbols, **assumptions)
File "sympy\core\function.py", line 622, in __new__
raise ValueError('Derivative expects Symbol [, Integer] args but
got %s, %s'
% (s, count))
ValueError: Derivative expects Symbol [, Integer] args but got 2*x, 1
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