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Calling a method using an argument
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C Gillespie
*nix forums beginner


Joined: 24 May 2005
Posts: 5

PostPosted: Fri Feb 04, 2005 8:23 am    Post subject: Re: Calling a method using an argument Reply with quote
Dear All,

Many thanks

Colin
"C Gillespie" <csgcsg39@hotmail.com> wrote in message
news:ctth3v$o2r$1@ucsnew1.ncl.ac.uk...
Quote:
Dear All,

I have a simple class
class hello:
def world(self):
return 'hello'
def test(self,arg):
return self.arg

When I want to do is:
hello.test('world')
'hello'

i.e. pass the method name as an argument. How should I do this?

Thanks

Colin

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Diez B. Roggisch
*nix forums Guru


Joined: 20 Feb 2005
Posts: 882

PostPosted: Thu Feb 03, 2005 7:30 pm    Post subject: Re: Calling a method using an argument Reply with quote
Quote:

def test(self, method, *args):
return getattr(self, method)(*args)

Yup, forgot abount that.

--
Regards,

Diez B. Roggisch
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Jeremy Bowers
*nix forums Guru Wannabe


Joined: 23 Feb 2005
Posts: 129

PostPosted: Thu Feb 03, 2005 6:28 pm    Post subject: Re: Calling a method using an argument Reply with quote
On Thu, 03 Feb 2005 15:48:05 +0000, C Gillespie wrote:

Quote:
Dear All,

I have a simple class
class hello:
def world(self):
return 'hello'
def test(self,arg):
return self.arg

When I want to do is:
hello.test('world')
'hello'

i.e. pass the method name as an argument. How should I do this?

In addition to Diez's point, I'd also point out you can do that from
outside the class:

Python 2.3.4 (#1, Jan 25 2005, 21:29:33)
[GCC 3.4.3 (Gentoo Linux 3.4.3, ssp-3.4.3-0, pie-8.7.6.6)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Quote:
class Simple:
.... def hello(self):

.... print "hello"
....
Quote:
s = Simple()
getattr(s, "hello")()
hello


which may be more useful depending on what you are doing. I mention this
because you are essentially re-implementing 'getattr' as a method of your
object and it is likely you don't *really* want to do that, but I don't
know, since we don't know what you are doing with this.
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Duncan Booth
*nix forums Guru


Joined: 11 Mar 2005
Posts: 422

PostPosted: Thu Feb 03, 2005 3:11 pm    Post subject: Re: Calling a method using an argument Reply with quote
Diez B. Roggisch wrote:

Quote:
If you have more args, do this:

def test(self, *args):
return getattr(self, args[0])(*args[1:])


This would be cleaner written as:

def test(self, method, *args):
return getattr(self, method)(*args)

and for complete generality:

def test(self, method, *args, **kw):
return getattr(self, method)(*args, **kw)
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Diez B. Roggisch
*nix forums Guru


Joined: 20 Feb 2005
Posts: 882

PostPosted: Thu Feb 03, 2005 3:02 pm    Post subject: Re: Calling a method using an argument Reply with quote
Diez B. Roggisch wrote:

Quote:
def test(self,arg):
return getattr(self, arg)


Oops, missed the calling:

def test(self,arg):
return getattr(self, arg)()


If you have more args, do this:

def test(self, *args):
return getattr(self, args[0])(*args[1:])


--
Regards,

Diez B. Roggisch
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Diez B. Roggisch
*nix forums Guru


Joined: 20 Feb 2005
Posts: 882

PostPosted: Thu Feb 03, 2005 2:56 pm    Post subject: Re: Calling a method using an argument Reply with quote
def test(self,arg):
return getattr(self, arg)

--
Regards,

Diez B. Roggisch
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C Gillespie
*nix forums beginner


Joined: 24 May 2005
Posts: 5

PostPosted: Thu Feb 03, 2005 2:48 pm    Post subject: Calling a method using an argument Reply with quote
Dear All,

I have a simple class
class hello:
def world(self):
return 'hello'
def test(self,arg):
return self.arg

When I want to do is:
Quote:
hello.test('world')
'hello'


i.e. pass the method name as an argument. How should I do this?

Thanks

Colin
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Google
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