Python Using Functions as Decorators

Python Using Functions as Decorators

#############Using Functions as Decorators###########
#http://www.python.org/dev/peps/pep-0318/
#http://www.siafoo.net/article/68

def apply(func):
   print "\n------func----", func
   print "\n------locals()----", locals()
   return func()

@apply
def test():
   print "\n----in test-----"
   return 'hello'

print "----1----", test

"""
Equal to
fun = apply(test)
"""

print "=========A========="

def apply1(t):
   print "\n----t------", t
   print "\n----locals()------", locals()
   def apply2(f):
       print "\n----f------", f
       print "\n----vars(f)------",  vars(f)
       print "\n-----locals()-----", locals()
       print "\n-----can access t here--------", t
       def apply3(x,y):
           print "\n----x,y------", x,y
           print "\n----- locals()-----", locals()
           print "\n-----can access t here--------", t
       print "\n-------apply3--------", apply3, vars(apply3)
       print "\n-------globals--------", globals()          
       return apply3
   print "\n-------apply2--------", apply2, vars(apply2)
   return apply2

t=100
@apply1(t)
def test1(a, b):
   print "\n----in test1-----"
   return a+b

print "\n----2-----", test1(5,5)

print "\n-------apply1--------", apply1, vars(apply1)
print "\n-------test1--------", test1, vars(test1)

"""
Equal to
fun = apply1(t)(test1)(a,b)

OR

apply2=apply1(t)
apply3=apply2(test1)
fun=apply3(a,b)
"""

print "=========B========="

"""
http://www.python.org/dev/peps/pep-0318/
http://www.siafoo.net/article/68

@dec2
@dec1
def func(arg1, arg2, ...):
   pass

This is equivalent to:

def func(arg1, arg2, ...):
   pass
func = dec2(dec1(func))

---------------------------------

@decomaker(argA, argB, ...)
def func(arg1, arg2, ...):
   pass

This is equivalent to:

func = decomaker(argA, argB, ...)(func)

"""
print "=========C========="

#############Using Class as Decorators###########
#http://www.artima.com/weblogs/viewpost.jsp?thread=240808


OUTPUT
=======

------func---- 

------locals()---- {'func': }

----in test-----
----1---- hello
=========A=========

----t------ 100

----locals()------ {'t': 100}

-------apply2--------  {}

----f------ 

----vars(f)------ {}

-----locals()----- {'t': 100, 'f': }

-----can access t here-------- 100

-------apply3--------  {}

-------globals-------- {'apply1': ,
'__builtins__': ,
'__file__': 'deco.py', '__package__': None, 't': 100,
'apply': , 'test': 'hello',
'__name__': '__main__', '__doc__': None}

----2-----
----x,y------ 5 5

----- locals()----- {'y': 5, 'x': 5, 't': 100}

-----can access t here-------- 100
None

-------apply1--------  {}

-------test1--------  {}
=========B=========
=========C=========