Python new.instancemethod() Examples

def _unjelly_method(self, rest):
        ''' (internal) unjelly a method
        '''
        im_name = rest[0]
        im_self = self.unjelly(rest[1])
        im_class = self.unjelly(rest[2])
        if type(im_class) is not types.ClassType:
            raise InsecureJelly("Method found with non-class class.")
        if im_class.__dict__.has_key(im_name):
            if im_self is None:
                im = getattr(im_class, im_name)
            elif isinstance(im_self, NotKnown):
                im = _InstanceMethod(im_name, im_self, im_class)
            else:
                im = instancemethod(im_class.__dict__[im_name],
                                    im_self,
                                    im_class)
        else:
            raise 'instance method changed'
        return im 

def force_unicode(s, encoding='UTF-8'):
        return str(s)

# new.instancemethod() is obsolete for new-style classes (Python 3.x)
# We need to use descriptor methods instead. 

def _unjelly_method(self, rest):
        """
        (internal) Unjelly a method.
        """
        im_name = rest[0]
        im_self = self.unjelly(rest[1])
        im_class = self.unjelly(rest[2])
        if type(im_class) is not types.ClassType:
            raise InsecureJelly("Method found with non-class class.")
        if im_name in im_class.__dict__:
            if im_self is None:
                im = getattr(im_class, im_name)
            elif isinstance(im_self, NotKnown):
                im = _InstanceMethod(im_name, im_self, im_class)
            else:
                im = instancemethod(im_class.__dict__[im_name],
                                    im_self,
                                    im_class)
        else:
            raise TypeError('instance method changed')
        return im 

def get_generic_cmd(obj, ui, cliclass=GenericCLI, aliases=None, gbl=None):
    """get a GenericCLI (or other) command set wrapping any class instance
    object. The wrapped objects public methods have CLI command counterparts
    automatically created."""
    import new
    from pycopia.methodholder import MethodHolder
    cmd = cliclass(ui, aliases)
    if gbl is None:
        gbl = globals()
    hashfilter = {}
    for name in _get_methodnames(obj):
        if hasattr(cmd, name):
            continue # don't override already defined methods
        # all this mess does is introspect the object methods and map it to a CLI
        # object method of the same name, with a docstring showing the attributes
        # and their default values, and the actual code mirroring the
        # _generic_call method in the GenericCLI class.
        else:
            obj_meth = getattr(obj, name)
            if id(obj_meth.__func__) in hashfilter: # filter out aliases
                continue
            else:
                hashfilter[id(obj_meth.__func__)] = True
            mh = MethodHolder(obj_meth)
            doc = "%s  *\n%s" % (mh, obj_meth.__doc__ or "")
            code = cliclass._generic_call.func_code
            nc = new.code(code.co_argcount, code.co_nlocals, code.co_stacksize,
                code.co_flags, code.co_code,
                (doc,)+code.co_consts[1:], # replace docstring
                code.co_names, code.co_varnames, code.co_filename,
                code.co_name, code.co_firstlineno, code.co_lnotab)
            f = new.function(nc, gbl, name)
            m = new.instancemethod(f, cmd, cliclass)
            setattr(cmd, name, m)
    cmd._setup(obj, "Object:%s> " % (obj.__class__.__name__,))
    return cmd 

def addStr(anInstance):
    anInstance.__str__ = new.instancemethod(__str__, anInstance, anInstance.__class__)

# Test it 

def install(self, methodIdentifier):
        """Install myself on my instance in place of this method.
        """
        oldMethod = getattr(self.instance, methodIdentifier, None)

        # XXX: this conditional probably isn't effective.
        if oldMethod is not self:
            # avoid triggering __setattr__
            self.instance.__dict__[methodIdentifier] = (
                new.instancemethod(self, self.instance,
                                   self.instance.__class__))
            self.oldMethod = (methodIdentifier, oldMethod) 

def __setitem__(self, n, obj):
        assert n == 0, "only zero index allowed"
        if not isinstance(obj, NotKnown):
            self.resolveDependants(instancemethod(self.my_class.__dict__[self.name],
                                                  obj,
                                                  self.my_class)) 

def unpickleMethod(im_name,
                    im_self,
                    im_class):
    'support function for copy_reg to unpickle method refs'
    try:
        unbound = getattr(im_class,im_name)
        if im_self is None:
            return unbound
        bound=instancemethod(unbound.im_func,
                                 im_self,
                                 im_class)
        return bound
    except AttributeError:
        log.msg("Method",im_name,"not on class",im_class)
        assert im_self is not None,"No recourse: no instance to guess from."
        # Attempt a common fix before bailing -- if classes have
        # changed around since we pickled this method, we may still be
        # able to get it by looking on the instance's current class.
        unbound = getattr(im_self.__class__,im_name)
        log.msg("Attempting fixup with",unbound)
        if im_self is None:
            return unbound
        bound=instancemethod(unbound.im_func,
                                 im_self,
                                 im_self.__class__)
        return bound 

def install(self, methodIdentifier):
        """Install myself on my instance in place of this method.
        """
        oldMethod = getattr(self.instance, methodIdentifier, None)

        # XXX: this conditional probably isn't effective.
        if oldMethod is not self:
            # avoid triggering __setattr__
            self.instance.__dict__[methodIdentifier] = (
                new.instancemethod(self, self.instance,
                                   self.instance.__class__))
            self.oldMethod = (methodIdentifier, oldMethod) 

def __setitem__(self, n, obj):
        assert n == 0, "only zero index allowed"
        if not isinstance(obj, NotKnown):
            self.resolveDependants(instancemethod(self.my_class.__dict__[self.name],
                                                  obj,
                                                  self.my_class)) 

def unpickleMethod(im_name,
                    im_self,
                    im_class):
    'support function for copy_reg to unpickle method refs'
    try:
        unbound = getattr(im_class,im_name)
        if im_self is None:
            return unbound
        bound=instancemethod(unbound.im_func,
                                 im_self,
                                 im_class)
        return bound
    except AttributeError:
        log.msg("Method",im_name,"not on class",im_class)
        assert im_self is not None,"No recourse: no instance to guess from."
        # Attempt a common fix before bailing -- if classes have
        # changed around since we pickled this method, we may still be
        # able to get it by looking on the instance's current class.
        unbound = getattr(im_self.__class__,im_name)
        log.msg("Attempting fixup with",unbound)
        if im_self is None:
            return unbound
        bound=instancemethod(unbound.im_func,
                                 im_self,
                                 im_self.__class__)
        return bound 

def __call__(self):
            '''Return a new bound-method like the original, or the
            original function if it was just a function or unbound
            method.
            Returns None if the original object doesn't exist.
            '''
            if self.is_dead():
                return None
            if self._obj is not None:
                return new.instancemethod(self._func, self._obj(), self._class)
            else:
                # we don't have an instance: return just the function
                return self._func 

def __call__(self):
            '''Return a new bound-method like the original, or the
            original function if it was just a function or unbound
            method.
            Returns None if the original object doesn't exist.
            '''
            if self.is_dead():
                return None
            if self._obj is not None:
                return new.instancemethod(self._func, self._obj(), self._class)
            else:
                # we don't have an instance: return just the function
                return self._func 

def setUp(self):
        TestCase.setUp(self)
        self.memcache = InMemoryMemcacheProtocol()
        self.ccn = MemcacheChangeNotifier(
            StubURLResource(':memory:'),
            cachePool=self.memcache)

        self.ccn._newCacheToken = instancemethod(_newCacheToken,
                                                 self.ccn,
                                                 MemcacheChangeNotifier) 

def curry1(func, arg):
    return new.instancemethod(func, arg, object) 

def addStr(anInstance):
    anInstance.__str__ = new.instancemethod(__str__, anInstance, anInstance.__class__)

# Test it 

def __init__(cls, name, bases, cls_dict):
            super(Memoized_Metaclass, cls).__init__(name, bases, cls_dict)

            for counter in cls_dict.get('memoizer_counters', []):
                method_name = counter.method_name

                counter.name = cls.__name__ + '.' + method_name
                counter.underlying_method = cls_dict[method_name]

                replacement_method = new.instancemethod(counter, None, cls)
                setattr(cls, method_name, replacement_method) 

def AddAdjustResults(test_set):
  def AdjustResults(self, results):
    for values in results.values():
      # Add the raw value to be expando'd and store a munged value in score.
      values['expando'] = values['raw_score']
      values['raw_score'] = int(round(values['raw_score'] / 2.0))
    return results
  test_set.AdjustResults = new.instancemethod(
      AdjustResults, test_set, test_set.__class__) 

def make_instancemethod(function, instance):
        return new.instancemethod(function.im_func, instance,
                                  instance.__class__) 

def make_instancemethod(function, instance):
        return new.instancemethod(function.im_func, instance,
                                  instance.__class__) 

def __init__(cls, name, bases, cls_dict):
        cls.use_metaclass = 1
        def fake_method(self):
            pass
        new.instancemethod(fake_method, None, cls) 

def _do_set_current_user(user_fun):
    setattr(_thread_locals, USER_ATTR_NAME, instancemethod(user_fun, _thread_locals, type(_thread_locals))) 

def AddMethod(object, function, name = None):
    """
    Adds either a bound method to an instance or an unbound method to
    a class. If name is ommited the name of the specified function
    is used by default.
    Example:
      a = A()
      def f(self, x, y):
        self.z = x + y
      AddMethod(f, A, "add")
      a.add(2, 4)
      print a.z
      AddMethod(lambda self, i: self.l[i], a, "listIndex")
      print a.listIndex(5)
    """
    import new

    if name is None:
        name = function.__name__
    else:
        function = RenameFunction(function, name)

    try:
        klass = object.__class__
    except AttributeError:
        # "object" is really a class, so it gets an unbound method.
        object.__dict__[name] = new.instancemethod(function, None, object)
    else:
        # "object" is really an instance, so it gets a bound method.
        object.__dict__[name] = new.instancemethod(function, object, klass) 

def get_generic_cmd(obj, ui, cliclass=GenericCLI, aliases=None, gbl=None):
    """get a GenericCLI (or other) command set wrapping any class instance
    object. The wrapped objects public methods have CLI command counterparts
    automatically created."""
    import new
    from methodholder import MethodHolder
    cmd = cliclass(ui, aliases)
    if gbl is None:
        gbl = globals()
    hashfilter = {}
    for name in _get_methodnames(obj):
        if hasattr(cmd, name):
            continue # don't override already defined methods
        # all this mess does is introspect the object methods and map it to a CLI
        # object method of the same name, with a docstring showing the attributes
        # and their default values, and the actual code mirroring the
        # _generic_call method in the GenericCLI class.
        else:
            obj_meth = getattr(obj, name)
            if id(obj_meth.im_func) in hashfilter: # filter out aliases
                continue
            else:
                hashfilter[id(obj_meth.im_func)] = True
            mh = MethodHolder(obj_meth)
            doc = "%s  *\n%s" % (mh, obj_meth.__doc__ or "")
            code = cliclass._generic_call.func_code
            nc = new.code(code.co_argcount, code.co_nlocals, code.co_stacksize, 
                code.co_flags, code.co_code, 
                (doc,)+code.co_consts[1:], # replace docstring
                code.co_names, code.co_varnames, code.co_filename, 
                code.co_name, code.co_firstlineno, code.co_lnotab)
            f = new.function(nc, gbl, name)
            m = new.instancemethod(f, cmd, cliclass)
            setattr(cmd, name, m)
    cmd._setup(obj, "Object:%s> " % (obj.__class__.__name__,))
    return cmd 

def get_parser(document=None, namespaces=0, validate=0, external_ges=1,
        logfile=None, doc_factory=POM.new_document):
    import xml
    if hasattr(xml, "use_pyxml"):
        xml.use_pyxml()
    import xml.sax.sax2exts
    import xml.sax.handler
    import new
    handler = ContentHandler(document, doc_factory=doc_factory, logfile=logfile)
    errorhandler = ErrorHandler(logfile)
    # create parser
    parser = xml.sax.sax2exts.XMLParserFactory.make_parser()
    parser.setFeature(xml.sax.handler.feature_namespaces, namespaces)
    parser.setFeature(xml.sax.handler.feature_validation, validate)
    parser.setFeature(xml.sax.handler.feature_external_ges, external_ges)
    parser.setFeature(xml.sax.handler.feature_external_pes, 0)
    parser.setFeature(xml.sax.handler.feature_string_interning, 1)
    # set handlers
    parser.setContentHandler(handler)
    parser.setDTDHandler(handler)
    parser.setEntityResolver(handler)
    parser.setErrorHandler(errorhandler)
    # since the xml API provides some generic parser I can't just
    # subclass I have to "patch" the object in-place with this trick.
    # This is to a) make the API compatible with the HTMLParser, and b)
    # allow specifing the encoding and other headers in the request.
    parser.parse_orig = parser.parse
    def parse(self, url, data=None, encoding=POM.DEFAULT_ENCODING,
                                    useragent=None, accept=None):
        from pycopia.WWW import urllibplus
        fo = urllibplus.urlopen(url, data, encoding, useragent=useragent, accept=accept)
        if logfile:
            from pycopia import UserFile
            fo = UserFile.FileWrapper(fo, logfile=logfile)
        return self.parse_orig(fo)
    parser.parse = new.instancemethod(parse, parser, parser.__class__)
    return parser 

def instancemethod(*args):
        return args[0] 

def save_instancemethod(self, obj):
    """ Save an instancemethod object """
    # Instancemethods are re-created each time they are accessed so this will not be memoized
    args = (obj.im_func, obj.im_self, obj.im_class)
    self.save_reduce(new.instancemethod, args) 

def _init_function(self, r):
        if isinstance(self.function, str):
            self.function = self.function.lower()
            _mapped = {'inverse': 'inverse_multiquadric',
                       'inverse multiquadric': 'inverse_multiquadric',
                       'thin-plate': 'thin_plate'}
            if self.function in _mapped:
                self.function = _mapped[self.function]

            func_name = "_h_" + self.function
            if hasattr(self, func_name):
                self._function = getattr(self, func_name)
            else:
                functionlist = [x[3:] for x in dir(self) if x.startswith('_h_')]
                raise ValueError("function must be a callable or one of " +
                                     ", ".join(functionlist))
            self._function = getattr(self, "_h_"+self.function)
        elif callable(self.function):
            allow_one = False
            if hasattr(self.function, 'func_code') or \
                   hasattr(self.function, '__code__'):
                val = self.function
                allow_one = True
            elif hasattr(self.function, "im_func"):
                val = get_method_function(self.function)
            elif hasattr(self.function, "__call__"):
                val = get_method_function(self.function.__call__)
            else:
                raise ValueError("Cannot determine number of arguments to function")

            argcount = get_function_code(val).co_argcount
            if allow_one and argcount == 1:
                self._function = self.function
            elif argcount == 2:
                if sys.version_info[0] >= 3:
                    self._function = self.function.__get__(self, Rbf)
                else:
                    import new
                    self._function = new.instancemethod(self.function, self,
                                                        Rbf)
            else:
                raise ValueError("Function argument must take 1 or 2 arguments.")

        a0 = self._function(r)
        if a0.shape != r.shape:
            raise ValueError("Callable must take array and return array of the same shape")
        return a0 

def watchObject(self, object, identifier, callback):
        """Watch the given object.

        Whenever I think the object might have changed, I'll send an
        ObjectLink of it to the callback.

        The identifier argument is used to generate identifiers for
        objects which are members of this one.
        """
        if type(object) is not types.InstanceType:
            raise TypeError, "Sorry, can only place a watch on Instances."

        # uninstallers = []

        dct = {}
        reflect.addMethodNamesToDict(object.__class__, dct, '')
        for k in object.__dict__.keys():
            dct[k] = 1

        members = dct.keys()

        clazzNS = {}
        clazz = new.classobj('Watching%s%X' %
                             (object.__class__.__name__, id(object)),
                             (_MonkeysSetattrMixin, object.__class__,),
                             clazzNS)

        clazzNS['_watchEmitChanged'] = new.instancemethod(
            lambda slf, i=identifier, b=self, cb=callback:
            cb(b.browseObject(slf, i)),
            None, clazz)

        # orig_class = object.__class__
        object.__class__ = clazz

        for name in members:
            m = getattr(object, name)
            # Only hook bound methods.
            if ((type(m) is types.MethodType)
                and (m.im_self is not None)):
                # What's the use of putting watch monkeys on methods
                # in addition to __setattr__?  Well, um, uh, if the
                # methods modify their attributes (i.e. add a key to
                # a dictionary) instead of [re]setting them, then
                # we wouldn't know about it unless we did this.
                # (Is that convincing?)

                monkey = _WatchMonkey(object)
                monkey.install(name)
                # uninstallers.append(monkey.uninstall)

        # XXX: This probably prevents these objects from ever having a
        # zero refcount.  Leak, Leak!
        ## self.watchUninstallers[object] = uninstallers 

def _init_function(self, r):
        if isinstance(self.function, str):
            self.function = self.function.lower()
            _mapped = {'inverse': 'inverse_multiquadric',
                       'inverse multiquadric': 'inverse_multiquadric',
                       'thin-plate': 'thin_plate'}
            if self.function in _mapped:
                self.function = _mapped[self.function]

            func_name = "_h_" + self.function
            if hasattr(self, func_name):
                self._function = getattr(self, func_name)
            else:
                functionlist = [x[3:] for x in dir(self) if x.startswith('_h_')]
                raise ValueError("function must be a callable or one of " +
                                     ", ".join(functionlist))
            self._function = getattr(self, "_h_"+self.function)
        elif callable(self.function):
            allow_one = False
            if hasattr(self.function, 'func_code') or \
                   hasattr(self.function, '__code__'):
                val = self.function
                allow_one = True
            elif hasattr(self.function, "im_func"):
                val = get_method_function(self.function)
            elif hasattr(self.function, "__call__"):
                val = get_method_function(self.function.__call__)
            else:
                raise ValueError("Cannot determine number of arguments to function")

            argcount = get_function_code(val).co_argcount
            if allow_one and argcount == 1:
                self._function = self.function
            elif argcount == 2:
                if sys.version_info[0] >= 3:
                    self._function = self.function.__get__(self, Rbf)
                else:
                    import new
                    self._function = new.instancemethod(self.function, self,
                                                        Rbf)
            else:
                raise ValueError("Function argument must take 1 or 2 arguments.")

        a0 = self._function(r)
        if a0.shape != r.shape:
            raise ValueError("Callable must take array and return array of the same shape")
        return a0