data snippets

data.py

def chunks(l, n):
    """Yield successive n-sized chunks from l."""
    for i in range(0, len(l), n):
        yield l[i:i + n]
        
def chunks_iter(l, n):
    it = iter(iterable)
    while True:
       chunk = tuple(itertools.islice(it, n))
       if not chunk:
           return
       yield chunk

def range_generator(upper, batch_size):
    """Yield successive n-sized chunks from l."""
    return [
        (i, i + batch_size)
        for i in range(0, upper, batch_size)
    ]