A Floating Point Range Generator

# a range generator that handles floating point values
# tested with Python25 and Python31   by  vegaseat

def frange(start, stop=None, step=1.0, delta=0.0000001):
    """
    a range generator that handles floating point numbers
    uses delta fuzzy logic to avoid float rep errors
    eg. stop=6.4 --> 6.3999999999999986 would slip through
    """
    # if start is missing it defaults to zero
    if stop == None:
        stop = start
        start = 0.0
    # allow for decrement
    if step <= 0:
        while start > (stop + delta):
            yield start
            start += step
    else:
        while start < (stop - delta):
            yield start
            start += step

# test, should stop before 6.4
# without the fuzzy logic 6.4 would give a problem
for x in frange(6.0, 6.4, 0.1):
    print(x)

print("-"*20)

# test decrement
for x in frange(-6.0, -6.4, -0.1):
    print(x)

print("-"*20)

# test default start and step keyword arg
print(list(frange(5, step=0.5)))

"""my output -->
6.0
6.1
6.2
6.3
--------------------
-6.0
-6.1
-6.2
-6.3
--------------------
[0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5]
"""