sympy/sympy — pull request #8201 by skirpichev (2014-10-05 19:14:48+00:00)
Title: Printing support for directional limits

Now:
```
In [1]: Limit(x, x, 0)
Out[1]:
lim x
x->0⁺

In [2]: Limit(x, x, 0, dir='-')
Out[2]:
lim x
x->0⁻

In [3]: init_printing(use_unicode=False)

In [4]: Limit(x, x, 0)
Out[4]:
lim x
x->0+

In [5]: Limit(x, x, 0, dir='-')
Out[5]:
lim x
x->0-

```