Calling a method using an argument

[C Gillespie]

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

 

[Diez B. Roggisch]

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

 

[Diez B. Roggisch]

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:])

 

[Duncan Booth]

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)

 

[Jeremy Bowers]

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'

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..... def hello(self):
.... print "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.

 

[Diez B. Roggisch]

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

Yup, forgot abount that.

 

[C Gillespie]

Dear All,

Many thanks

Colin

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'

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

Thanks

Colin