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Edit File : Range.py \| Size : 3.05 KB
"""Example of a generator: re-implement the built-in range function without actually constructing the list of values. OldStyleRange is coded in the way required to work in a 'for' loop before iterators were introduced into the language; using __getitem__ and __len__ . """ def handleargs(arglist): """Take list of arguments and extract/create proper start, stop, and step values and return in a tuple""" try: if len(arglist) == 1: return 0, int(arglist[0]), 1 elif len(arglist) == 2: return int(arglist[0]), int(arglist[1]), 1 elif len(arglist) == 3: if arglist[2] == 0: raise ValueError("step argument must not be zero") return tuple(int(x) for x in arglist) else: raise TypeError("range() accepts 1-3 arguments, given", len(arglist)) except TypeError: raise TypeError("range() arguments must be numbers or strings " "representing numbers") def genrange(a): """Function to implement 'range' as a generator""" start, stop, step = handleargs(a) value = start while value < stop: yield value value += step class oldrange: """Class implementing a range object. To the user the instances feel like immutable sequences (and you can't concatenate or slice them) Done using the old way (pre-iterators; __len__ and __getitem__) to have an object be used by a 'for' loop. """ def __init__(self, a): """ Initialize start, stop, and step values along with calculating the nubmer of values (what __len__ will return) in the range""" self.start, self.stop, self.step = handleargs(a) self.len = max(0, (self.stop - self.start) // self.step) def __repr__(self): """implement repr(x) which is also used by print""" return 'range(%r, %r, %r)' % (self.start, self.stop, self.step) def __len__(self): """implement len(x)""" return self.len def __getitem__(self, i): """implement x[i]""" if 0 <= i <= self.len: return self.start + self.step * i else: raise IndexError, 'range[i] index out of range' def test(): import time, __builtin__ #Just a quick sanity check correct_result = __builtin__.range(5, 100, 3) oldrange_result = list(oldrange(5, 100, 3)) genrange_result = list(genrange(5, 100, 3)) if genrange_result != correct_result or oldrange_result != correct_result: raise Exception("error in implementation:\ncorrect = %s" "\nold-style = %s\ngenerator = %s" % (correct_result, oldrange_result, genrange_result)) print "Timings for range(1000):" t1 = time.time() for i in oldrange(1000): pass t2 = time.time() for i in genrange(1000): pass t3 = time.time() for i in __builtin__.range(1000): pass t4 = time.time() print t2-t1, 'sec (old-style class)' print t3-t2, 'sec (generator)' print t4-t3, 'sec (built-in)' if __name__ == '__main__': test() Back

Edit File : Range.py | Size : 3.05 KB

"""Example of a generator: re-implement the built-in range function
without actually constructing the list of values.

OldStyleRange is coded in the way required to work in a 'for' loop before
iterators were introduced into the language; using __getitem__ and __len__ .

"""
def handleargs(arglist):
    """Take list of arguments and extract/create proper start, stop, and step
    values and return in a tuple"""
    try:
        if len(arglist) == 1:
            return 0, int(arglist[0]), 1
        elif len(arglist) == 2:
            return int(arglist[0]), int(arglist[1]), 1
        elif len(arglist) == 3:
            if arglist[2] == 0:
                raise ValueError("step argument must not be zero")
            return tuple(int(x) for x in arglist)
        else:
            raise TypeError("range() accepts 1-3 arguments, given", len(arglist))
    except TypeError:
        raise TypeError("range() arguments must be numbers or strings "
        "representing numbers")

def genrange(*a):
    """Function to implement 'range' as a generator"""
    start, stop, step = handleargs(a)
    value = start
    while value < stop:
        yield value
        value += step

class oldrange:
    """Class implementing a range object.
    To the user the instances feel like immutable sequences
    (and you can't concatenate or slice them)

Done using the old way (pre-iterators; __len__ and __getitem__) to have an
    object be used by a 'for' loop.

"""

def __init__(self, *a):
        """ Initialize start, stop, and step values along with calculating the
        nubmer of values (what __len__ will return) in the range"""
        self.start, self.stop, self.step = handleargs(a)
        self.len = max(0, (self.stop - self.start) // self.step)

def __repr__(self):
        """implement repr(x) which is also used by print"""
        return 'range(%r, %r, %r)' % (self.start, self.stop, self.step)

def __len__(self):
        """implement len(x)"""
        return self.len

def __getitem__(self, i):
        """implement x[i]"""
        if 0 <= i <= self.len:
            return self.start + self.step * i
        else:
            raise IndexError, 'range[i] index out of range'

def test():
    import time, __builtin__
    #Just a quick sanity check
    correct_result = __builtin__.range(5, 100, 3)
    oldrange_result = list(oldrange(5, 100, 3))
    genrange_result = list(genrange(5, 100, 3))
    if genrange_result != correct_result or oldrange_result != correct_result:
        raise Exception("error in implementation:\ncorrect   = %s"
                         "\nold-style = %s\ngenerator = %s" %
                         (correct_result, oldrange_result, genrange_result))
    print "Timings for range(1000):"
    t1 = time.time()
    for i in oldrange(1000):
        pass
    t2 = time.time()
    for i in genrange(1000):
        pass
    t3 = time.time()
    for i in __builtin__.range(1000):
        pass
    t4 = time.time()
    print t2-t1, 'sec (old-style class)'
    print t3-t2, 'sec (generator)'
    print t4-t3, 'sec (built-in)'

if __name__ == '__main__':
    test()

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