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global PASSWORD
PASSWORD = "Guild o' Code"


    

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def halver(num):
    """Returns half of the 'num' argument."""  # docstring
    return num / 2


    

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print "halver's name:", halver.__name__
print "halver's docstring:", halver.__doc__


    

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halver?


    

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print halver(20)


    

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print halver(10)


    

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print halver(5)


    

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print [i/2 for i in range(10)]


    

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print [i/2.0 for i in range(10)]


    

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print [float(i)/2 for i in range(10)]


    

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def float_wrapper(func):
    def wrapper(float_me):
        return func(float(float_me))
    return wrapper


    

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print float_wrapper(halver)(10)
print float_wrapper(halver)(5)


    

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halve = float_wrapper(halver)


    

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print halver(10)
print halver(5)


    

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def halver(num):
    """Returns half of the 'num' argument.
    This is a reimplementation of halver()."""
    return num / 2
halver = float_wrapper(halver)


    

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print halve(5)


    

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@float_wrapper
def halver2(num):
    """Returns half of the 'num' argument.
    This is a re-reimplementation of halver()."""
    return num / 2


    

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print halver2(5)


    

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print "halver's name:", halver.__name__
print "halver's docstring:", halver.__doc__

print "halver2's name:", halver2.__name__
print "halver2's docstring:", halver2.__doc__


    

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halver?


    

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import functools

def better_float_wrapper(func):
    @functools.wraps(func)       # this line is the only difference
    def wrapper(num):
        return func(float(num))
    return wrapper


    

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@better_float_wrapper
def halver3(num):
    """Returns half of the 'num' argument.
    This is a re-reimplementation of halve()."""
    return num / 2


    

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print halver3(5)
print "halver3's name:", halver3.__name__
print "halver3's docstring:", halver3.__doc__


    

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halver3?


    

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class StrictAttributeHolder(object):
    def __init__(self):
        self._int_val = None
        
    @property
    def int_val(self):
        if self._int_val is not None:
            return self._int_val
        else:
            raise Exception("Can't read what isn't written!")
    
    @int_val.setter
    def int_val(self, value):
        if isinstance(value, int):
            self._int_val = value
        else:
            raise TypeError("Can't set int_val to a non-int value!")


    

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sah = StrictAttributeHolder()


    

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print sah.int_val


    

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sah.int_val = 5


    

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print sah.int_val


    

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sah.int_val = 5.0


    

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sah.int_val = [5]


    

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# Create a @timed_function decorator that computes and prints the execution time of
# any function that it wraps.  Use *args and **kwargs to capture all function
# arguments.

def timed_function(func):
    # Your implementation here
    pass


    

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# Create a @case_mod decorator that gives any function that it wraps an
# all-lowercase version of an input string and then returns an all-uppercase
# version of the wrapped function's output

def case_mod(func):
    # Your implementation here
    pass


    

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# Create a @secured_function decorator that looks for a global password before
# running the wrapped function and will raise an exception instead of running
# the wrapped function if the wrong password is provided. Use *args and **kwargs
# capture all function arguments.

def timed_function(func):
    global PASSWORD
    # Your implementation here
    pass


    

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# Execute this cell without modifying it.
picky_eater_food = "You can now write your own decorators!".split(' ')

@secured_function
@timed_function
@case_mod
def picky_eater(food):
    if food.islower():
        time.sleep(0.1 * len(food))
        return food
    else:
        raise Exception("I don't wanna eat this!")


    

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# Change ONLY the assigned value of PASSWORD in this cell, then
# execute it.
global PASSWORD
PASSWORD = ''


    

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# Run this cell as-is without any exceptions cropping up and with
# an execution time printed out for each morsel in picky_eater_food.
for morsel in picky_eater_food:
    print picky_eater(morsel)