Как использовать свои функции в ipython --pylab?

def my_func():
        return 'This is my func result'

In [1]: import my_file

In [2]: result = my_file.my_func()

In [3]: result
Out[3]: 'This is my func result'

In [4]: from my_file import my_func

In [5]: result = my_func()

In [6]: result
Out[6]: 'This is my func result'