sympy/sympy — pull request #1376 by jrioux (2012-06-22 10:33:10+00:00)
Title: Implement integral of Piecewise with symbolic bounds.

```
In [1]: p = Piecewise( (0, x<0), (x, x<=1), (1, True)); p
Out[1]:
/0 for x < 0
|