Project organization and import

[Michele Simionato]

On Mar 5, 1:21 am, "Martin Unsal" <martinun... at gmail.com> wrote:

> 2) Importing and reloading. I want to be able to reload changes
> without exiting the interpreter.

What about this?

$ cat reload_obj.py
"""
Reload a function or a class from the filesystem.

For instance, suppose you have a module

$ cat mymodule.py
def f():
    print 'version 1 of function f'

Suppose you are testing the function from the interactive interpreter:

>>> from mymodule import f
>>> f()
version 1 of function f

Then suppose you edit mymodule.py:

$ cat mymodule.py
def f():
    print 'version 2 of function f'

You can see the changes in the interactive interpreter simply by doing

>>> f = reload_obj(f)
>>> f()
version 2 of function f
"""

import inspect

def reload_obj(obj):
    assert inspect.isfunction(obj) or inspect.isclass(obj)
    mod = __import__(obj.__module__)
    reload(mod)
    return getattr(mod, obj.__name__)

Pretty simple, isn't it?

The issue is that if you have other objects dependending on the
previous version
of the function/class, they will keep depending on the previous
version, not on
the reloaded version, but you cannot pretende miracles from reload! ;)

You can also look at Michael Hudson's recipe

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/160164

for a clever approach to automatic reloading.

           Michele Simionato