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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def quote_split(sep,string):
 """ Splits the strings into pieces divided by sep, when sep in not inside quotes. """

    if len(sep) != 1: raise Exception("Separation string must be one character long")
    retlist = []
    squote = False
    dquote = False
    left = 0
    i = 0
    while i < len(string):
        if string[i] == '"' and not dquote:
            if not squote:
                squote = True
            elif (i+1) < len(string) and string[i+1] == '"':
                i += 1
            else:
                squote = False
        elif string[i] == "'" and not squote:
            if not dquote:
                dquote = True
            elif (i+1) < len(string) and string[i+1] == "'":
                i += 1
            else:
                dquote = False            
        elif string[i] == sep and not dquote and not squote:
            retlist.append(string[left:i])
            left = i + 1
        i += 1
    retlist.append(string[left:])
    return retlist