Export a recarray *r* to a CSV file *filename*

def rec2csv(r, filename):
    """Export a recarray *r* to a CSV file *filename*"""
    names = r.dtype.names
    def translate(x):
        if x is None or str(x).lower == "none":
            x = ""
        return str(x)
    with open(filename, "w") as csv:
        csv.write(",".join([str(x) for x in names])+"\n")
        for data in r:
            csv.write(",".join([translate(x) for x in data])+"\n")
    #print "Wrote CSV table %r" % filename
    return filename