Re: Given a string - execute a function by the same name

[python@bdurham.com]

Bruno,

Thank you for your detailed analysis. I learned a lot about Python
reading everyone's responses.

For development I'm using #5: "globals().get( "func")" because its
seamless to add additional functionality.

But when I release into production I'm going to shift to #3: "Place all
my functions in dictionary and lookup the function to be called". This
technique will allow me to precisely control the dynamic nature of my
application.

Thanks again to everyone who contributed on this thread.

Regards,
Malcolm

[Arnaud Delobelle]

Re: Given a string - execute a function by the same name

On 29 Apr, 13:10, pyt...@bdurham. com wrote:

Bruno,
>
Thank you for your detailed analysis. I learned a lot about Python
reading everyone's responses.
>
For development I'm using #5: "globals().get( "func")" because its
seamless to add additional functionality.
>
But when I release into production I'm going to shift to #3: "Place all
my functions in dictionary and lookup the function to be called". This
technique will allow me to precisely control the dynamic nature of my
application.
>
Thanks again to everyone who contributed on this thread.
>
Regards,
Malcolm

You could avoid #5 from the start using a decorator:

functions = {}

def register(func):
functions[func.__name__] = func
return func

@register
def foo(): print "Foo!"

@register
def bar(): print "Bar!"

>>functions

{'foo': <function foo at 0x6f2f0>, 'bar': <function bar at 0x6f330>}

>>functions['bar']()

Bar!

--
Arnaud

[python@bdurham.com]

Re: Given a string - execute a function by the same name

Arnaud,

Just when I thought my solution couldn't get any better :)

Thanks for that great tip and for an excellent demonstration of using a
decorator.

Regards,
Malcolm

<snip>
You could avoid #5 from the start using a decorator:

functions = {}

def register(func):
functions[func.__name__] = func
return func

@register
def foo(): print "Foo!"

@register
def bar(): print "Bar!"

>>functions

{'foo': <function foo at 0x6f2f0>, 'bar': <function bar at 0x6f330>}

>>functions['bar']()

Bar!
</snip>

[python@bdurham.com]

Re: Given a string - execute a function by the same name

Erik,

Perhaps I missed something earlier in the thread, but I really don't see the need for that registry dict or the register decorator. Python already

maintains a dictionary for each scope:

The advantage of the decorator technique is that you explicitly declare
which functions are eligible for execution.

Using locals() is too broad because it might allow a user to execute an
unintended function.

Malcolm