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What is the difference between these two? (Assigning functions to variables)

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  What is the difference between these two? (Assigning functions to variables) Max Nathaniel Ho <maxhowl86@gmail.com> - 2014-11-04 19:15 -0800
    Re: What is the difference between these two? (Assigning functions to variables) Max Nathaniel Ho <maxhowl86@gmail.com> - 2014-11-04 19:17 -0800
      Re: What is the difference between these two? (Assigning functions to variables) Cameron Simpson <cs@zip.com.au> - 2014-11-05 16:59 +1100
        Re: What is the difference between these two? (Assigning functions to variables) Max Nathaniel Ho <maxhowl86@gmail.com> - 2014-11-04 23:33 -0800

#80243 — What is the difference between these two? (Assigning functions to variables)

Example 1

def compose_greet_func():
    def get_message():
        return "Hello there!"

    return get_message

greet = compose_greet_func()
print greet()


Example 2 

def greet(name):
    return "hello "+name

greet_someone = greet
print greet_someone("John"

In Example 1, the function compoe_greet_func is assigned to the variable greet, and () is included at the end of the function.

However, in Example 2, the function greet is assigned to the variable greet_someone but () is excluded at the end of the function.

Does the () matter when assigning functions to variables? 

Thank you!

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#80244

Just to be clear, I was referring to these two lines

greet = compose_greet_func() 

greet_someone = greet 

On Wednesday, November 5, 2014 11:15:46 AM UTC+8, Max Nathaniel Ho wrote:
> Example 1
> 
> def compose_greet_func():
>     def get_message():
>         return "Hello there!"
> 
>     return get_message
> 
> greet = compose_greet_func()
> print greet()
> 
> 
> Example 2 
> 
> def greet(name):
>     return "hello "+name
> 
> greet_someone = greet
> print greet_someone("John"
> 
> In Example 1, the function compoe_greet_func is assigned to the variable greet, and () is included at the end of the function.
> 
> However, in Example 2, the function greet is assigned to the variable greet_someone but () is excluded at the end of the function.
> 
> Does the () matter when assigning functions to variables? 
> 
> Thank you!

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#80246

On 04Nov2014 19:17, Max Nathaniel Ho <maxhowl86@gmail.com> wrote:
>Just to be clear, I was referring to these two lines
>
>greet = compose_greet_func()
>
>greet_someone = greet

Please don't top-post. Thanks.

Your first assignment:

   greet = compose_greet_func()

_calls_ (runs) the compose_greet_func and assigns its return value to greet.

Your second assignment:

   greet_someone = greet

assigns the current value of "greet", whatever that is, to "greet_someone". No 
function is called.

Cheers,
Cameron Simpson <cs@zip.com.au>

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#80252

On Wednesday, November 5, 2014 2:00:08 PM UTC+8, Cameron Simpson wrote:
> On 04Nov2014 19:17, Max Nathaniel Ho <maxhowl86@gmail.com> wrote:
> >Just to be clear, I was referring to these two lines
> >
> >greet = compose_greet_func()
> >
> >greet_someone = greet
> 
> Please don't top-post. Thanks.
> 
> Your first assignment:
> 
>    greet = compose_greet_func()
> 
> _calls_ (runs) the compose_greet_func and assigns its return value to greet.
> 
> Your second assignment:
> 
>    greet_someone = greet
> 
> assigns the current value of "greet", whatever that is, to "greet_someone". No 
> function is called.
> 
> Cheers,
> Cameron Simpson <cs@zip.com.au>

Apologies about the top posting.

Ahh okay, thank you for your explanation

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