Comment 2 for bug 269966

This is indeed a problem, however disabling the above line is not a viable solution, as you can see here. If you comment out that last line, you'll get this behavior:

In [9]: cat tclass.py
"""Simple script to instantiate a class for testing %run"""

class foo: pass

def f():
    return foo()

x = f()

In [10]: run tclass

In [11]: x
Out[11]: <__main__.foo instance at 0x7fc79a42a638>

In [12]: f()
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)

/home/fperez/ipython/repo/trunk-dev/IPython/tests/tclass.py in <module>()
----> 1
      2
      3
      4
      5

/home/fperez/ipython/repo/trunk-dev/IPython/tests/tclass.py in f()
      4
      5 def f():
----> 6 return foo()
      7
      8 x = f()

TypeError: 'NoneType' object is not callable

If that main namespace isn't kept somewhere, it becomes impossible to later use certain things defined in the script (such as instantiating classes).

I still don't have a good solution for this, I'm afraid. Any ideas welcome...