@entryExit
def func1():
  print "inside func1()"

@entryExit
def func2():
  print "inside func2()"

@myDecorator
def aFunction():
  print "inside aFunction"

class myDecorator(object):

  def __init__(self, f):
    print "inside myDecorator.__init__()"
    f() # Prove that function definition has completed

  def __call__(self):
    print "inside myDecorator.__call__()"

@myDecorator
def aFunction():
  print "inside aFunction()"

print "Finished decorating aFunction()"

aFunction()

inside myDecorator.__init__()
inside aFunction()
Finished decorating aFunction()
inside myDecorator.__call__()

def foo(): pass
foo = staticmethod(foo)

@staticmethod
def foo(): pass

class entryExit(object):

  def __init__(self, f):
    self.f = f

  def __call__(self):
    print "Entering", self.f.__name__
    self.f()
    print "Exited", self.f.__name__

@entryExit
def func1():
  print "inside func1()"

@entryExit
def func2():
  print "inside func2()"

func1()
func2()

Entering func1
inside func1()
Exited func1
Entering func2
inside func2()
Exited func2

def entryExit(f):
  def new_f():
    print "Entering", f.__name__
    f()
    print "Exited", f.__name__
  return new_f

@entryExit
def func1():
  print "inside func1()"

@entryExit
def func2():
  print "inside func2()"

func1()
func2()
print func1.__name__

def entryExit(f):
  def new_f():
    print "Entering", f.__name__
    f()
    print "Exited", f.__name__
  new_f.__name__ = f.__name__
  return new_f

class decoratorWithArguments(object):

  def __init__(self, arg1, arg2, arg3):
    """
    If there are decorator arguments, the function
    to be decorated is not passed to the constructor!
    """
    print "Inside __init__()"
    self.arg1 = arg1
    self.arg2 = arg2
    self.arg3 = arg3

  def __call__(self, f):
    """
    If there are decorator arguments, __call__() is only called
    once, as part of the decoration process! You can only give
    it a single argument, which is the function object.
    """
    print "Inside __call__()"
    def wrapped_f(*args):
      print "Inside wrapped_f()"
      print "Decorator arguments:", self.arg1, self.arg2, self.arg3
      f(*args)
      print "After f(*args)"
    return wrapped_f

@decoratorWithArguments("hello", "world", 42)
def sayHello(a1, a2, a3, a4):
  print 'sayHello arguments:', a1, a2, a3, a4

print "After decoration"

print "Preparing to call sayHello()"
sayHello("say", "hello", "argument", "list")
print "after first sayHello() call"
sayHello("a", "different", "set of", "arguments")
print "after second sayHello() call"

Inside __init__()
Inside __call__()
After decoration
Preparing to call sayHello()
Inside wrapped_f()
Decorator arguments: hello world 42
sayHello arguments: say hello argument list
After f(*args)
after first sayHello() call
Inside wrapped_f()
Decorator arguments: hello world 42
sayHello arguments: a different set of arguments
After f(*args)
after second sayHello() call

def decoratorFunctionWithArguments(arg1, arg2, arg3):
  def wrap(f):
    print "Inside wrap()"
    def wrapped_f(*args):
      print "Inside wrapped_f()"
      print "Decorator arguments:", arg1, arg2, arg3
      f(*args)
      print "After f(*args)"
    return wrapped_f
  return wrap

@decoratorFunctionWithArguments("hello", "world", 42)
def sayHello(a1, a2, a3, a4):
  print 'sayHello arguments:', a1, a2, a3, a4

print "After decoration"

print "Preparing to call sayHello()"
sayHello("say", "hello", "argument", "list")
print "after first sayHello() call"
sayHello("a", "different", "set of", "arguments")
print "after second sayHello() call"

Inside wrap()
After decoration
Preparing to call sayHello()
Inside wrapped_f()
Decorator arguments: hello world 42
sayHello arguments: say hello argument list
After f(*args)
after first sayHello() call
Inside wrapped_f()
Decorator arguments: hello world 42
sayHello arguments: a different set of arguments
After f(*args)
after second sayHello() call