calling function by symbolic reference

$obj = new MyObject;
$f = 'foo';

$obj->$f($args);

def foo():
    print "OK"

ref = foo
ref()  # prints "OK"

>>> def foo():
...     print "Found it!"
...
>>> globals()['foo']()
Found it!
>>> globals()
{'__builtins__': <module '__builtin__' (built-in)>, '__name__': '__main__', 'foo': <function foo at 0x81612cc>, '__doc__': None}
>>> globals()['foo']
<function foo at 0x81612cc>

class Foo:
    def __init__(self):
        pass
    def ok(self):
        print "OK"
    def notok(self):
        print "nope"

obj = Foo()

# say I have a list of strings that correspond to 
# methods in class Foo. The string (method) to 
# call is decided at runtime:

strings = ['ok', 'notok']

for s in strings:
    # I want to be able to call a method using 
    # the variable 's' as the name of the method
    obj.s()   # this won't work, no method 's'

class Foo:
    def __init__(self):
        pass
    def ok(self):
        print "OK"
    def notok(self):
        print "nope"

obj = Foo()

strings = ['ok', 'notok']

for s in strings:
    obj.__class__.__dict__[s](obj)

obj.ok()

class Foo:
    def __init__(self):
        pass
    def ok(self):
        print "OK"
    def notok(self):
        print "nope"

obj = Foo()

strings = ['ok', 'notok']

for string in strings:
    eval("obj.%s()" % string)