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From: "Prasad, Ramit" <ramit.prasad@jpmorgan.com.dmarc.invalid>
To: "python-list@python.org" <python-list@python.org>
Subject: RE: refresing the edited python function
Thread-Topic: refresing the edited python function
Thread-Index: AQHOnXMazhc7jGa+rEm0mc50BzCUoJmeMzCg
Date: Tue, 20 Aug 2013 15:08:48 +0000
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alex23
> 
> On 19/08/2013 10:55 AM, Sudheer Joseph wrote:
> > I have been using ipython and ipython with qtconsole and working on a
> > code with functions. Each time I make a modification in function
> > I have to quit IPTHON console (in both with and with out qt console )
> > and reload the function freshly. If I need to see the changed I made in
> > the function. I tried below options
> 
> > del function name
> > import the module again  by issuing "from xxx.py import yy"
> 
> This doesn't re-import the module if xxx has already been imported. It
> simply rebinds xxx.yy to yy.
> 
> > import xxx.py
> 
> This also doesn't re-import the module if it has already been imported.
> 
> When you import a module, or a function from a module, a module object
> is created and stored in sys.modules. Any subsequent 'import <module>'
> calls will return a reference to that module object, and won't reload
> from file at all.
> 
> You can easily verify this by creating a test module 'foo' with a single
> line of `print('loading foo')` and then trying this from the console:
> 
>      In [1]: import foo
>      loading foo
> 
>      In [2]: del foo
> 
>      In [3]: import foo
> 
>      In [4]:
> 
> Note that you only see 'loading foo' the first time you import the
> module. In order to have the module loaded again rather than returning
> the existing reference, you would use `reload(foo)`:
> 
>      In [5]: reload(foo)
>      loading foo
> 
> So: in order to be able to use functions from a re-loaded module, you
> should always refer to them via the module object, and not import them
> directly:
> 
>      >>> import xxx
>      >>> xxx.yy() # original code
>      # ...modify function `yy` in your source file
>      >>> reload(xxx)
>      >>> xxx.yy() # new code
> 
> Or: you can reload the module and then rebind the functions:
> 
>      >>> from xxx import yy
>      >>> yy() # original code
>      # ...modify function `yy` in your source file
>      >>> reload(xxx)
>      >>> from xxx import yy
>      >>> yy() # new code
> 
> Hope this helps.
> 
> --

In Python 3 the reload built-in was moved to the imp module.
So use imp.reload(<module>) instead.


~Ramit



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