power of pi

[sympy-issue-migrator]

Bug of power:

In [1]: x = pi**-1

In [2]: x.evalf()

In [3]: a = x.evalf()

In [4]: a

In [5]: type(a)
Out[5]: <type 'NoneType'>

Original issue for #3131: http://code.google.com/p/sympy/issues/detail?id=32

Original author: https://code.google.com/u/103948515893177094863/

Original owner: https://code.google.com/u/103948515893177094863/

[sympy-issue-migrator]

must be a bug in power, for example: 

a = Pow(Real(2), Real(4))

also returns a NoneType

Original comment: http://code.google.com/p/sympy/issues/detail?id=32#c1

Original author: https://code.google.com/u/103948515893177094863/

[sympy-issue-migrator]

solved. It was a recursion issue.

Original comment: http://code.google.com/p/sympy/issues/detail?id=32#c2

Original author: https://code.google.com/u/103948515893177094863/

[sympy-issue-migrator]

no, it is not solved

Original comment: http://code.google.com/p/sympy/issues/detail?id=32#c3

Original author: https://code.google.com/u/103948515893177094863/

[sympy-issue-migrator]

**Status:** Started  

Original comment: http://code.google.com/p/sympy/issues/detail?id=32#c4

Original author: https://code.google.com/u/103948515893177094863/

[certik]

Right. The Real class is not very much tested. There are probably more bugs like
this. If you need some help, just ask.

Original comment: http://code.google.com/p/sympy/issues/detail?id=32#c5

Original author: https://code.google.com/u/104039945248245758823/

[certik]

Just be sure to write a test for each bug you discover, so that when we fix it, it
won't ever happen again.

Original comment: http://code.google.com/p/sympy/issues/detail?id=32#c6

Original author: https://code.google.com/u/104039945248245758823/

[sympy-issue-migrator]

fixed in svn

**Status:** Fixed  

Original comment: http://code.google.com/p/sympy/issues/detail?id=32#c7

Original author: https://code.google.com/u/103948515893177094863/