Referencing vars, methods and classes by name

[Sagari]

Greetings,

Sorry for a newbiw question: what is a most elegant and/or effective
way to reference vars, methods and classes by their names in Python?

To illustrate, PHP code:

$a = ''b';
$$a = $something; // assign to $b
$$a($p1); // call function b($p1)
$obj->$a(); // call method b() of the instance $obj

What is the Python way of performing the same indirections?

References to online docs/articles related to the subject are very
welcome.

Thank you!

Konstantin

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Re: Referencing vars, methods and classes by name

[Sagari]

Quite forgot to add the obvious example (in PHP):

$a = 'b';
$obj =& new $a(); // instantiating class b()

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Re: Referencing vars, methods and classes by name

[Sagari]

> For your other examples there are gross hacks using the dictionaries
> that represent the local and global symbol tables, so we translate
> your examples fairly directly, but stylistically we'd usually stay
> away from that kind of thing.

Thanks to everyone for all the comments. I am migrating from PHP to
Python and I am looking for the means to port a controller code that
would, roughly speaking, call a certain method of a certain class
(both class and method names taken from user input). Putting aside
input verification (by the moment I perform the call input must have
been verified), what would be the recommended way of doing the trick?

Thanks!

All the best,

Konstantin

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Calling class method by name passed in variable

[Sagari]

Greetings,

Can someone suggest an efficient way of calling method whose name is
passed in a variable?

Given something like:

class X:
#...
  def a(self):
# ...

  def b(self):
# ...

#...

x = X()
#...
v = 'a'

How do I call the method of x  whose name is stored in v?

PHP code for this would be:

class X {
  function a() {
  }
}

$x = new X();
$v = 'a';
$x->$v();

I need a solution for Python. Could you suggest anything?

The task it to call a function whose name is taken from user-supplied
input.

Thanks.
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Re: Calling class method by name passed in variable

[Sagari]

Thanks to everyone for the advice. In fact, since all the called
methods trap necessary exceptions, I see no big problems with that.

With all respect,

Konstantin
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