Comment #3 on issue 2421 by smi...@gmail.com: python(expr) issues
http://code.google.com/p/sympy/issues/detail?id=2421
The problem in the last comment is that you couldn't run that as python
code and have it work.
Also, there is a strange error when trying to S to srepr form of piecewise:
>>> q
Piecewise((1, [0, 1)))
>>> srepr(q)
"Function('Piecewise')(Function('ExprCondPair')(Integer(1),
Interval(Integer(0), Integer(1), False, True)))"
>>> S(_)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy/core/basic.py", line 501, in __repr__
return sstr(self)
File "sympy/printing/str.py", line 439, in sstr
s = p.doprint(expr)
File "sympy/printing/printer.py", line 224, in doprint
return self._str(self._print(expr))
File "sympy/printing/printer.py", line 248, in _print
return getattr(self, printmethod)(expr, *args)
File "sympy/printing/str.py", line 105, in _print_Function
return expr.func.__name__ + "(%s)"%self.stringify(expr.args, ", ")
File "sympy/printing/str.py", line 28, in stringify
return sep.join([self.parenthesize(item, level) for item in args])
File "sympy/printing/str.py", line 25, in parenthesize
return self._print(item)
File "sympy/printing/printer.py", line 248, in _print
return getattr(self, printmethod)(expr, *args)
File "sympy/printing/str.py", line 99, in _print_ExprCondPair
return '(%s, %s)' % (expr.expr, expr.cond)
AttributeError: 'ExprCondPair' object has no attribute 'expr'
It does have that attribute. I don't know why the error is raising.
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