how to "reimport" module to python then code be changed after import

Question

I have a foo.py

def foo():
    print "test"

In IPython I use:

In [6]:  import foo
In [7]:  foo.foo()
test

Then I changed the foo() to:

def foo():
    print "test changed"

In IPython, the result for invoking is still test:

In [10]:  import foo
In [11]:  foo.foo()
test

Then I use:

In [15]: del foo
In [16]:  import foo
In [17]:  foo.foo()
test

I delete the foo.pyc in same folder foo.py exists, but still no luck.

May I know how to reimport the updated code in runtime?

Answer 1

For Python 2.x

reload(foo)

For Python 3.x

import importlib
import foo #import the module here, so that it can be reloaded.
importlib.reload(foo)