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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 get_indices(s: Union[str, 'ChainedBase']) -> Dict[int, str]: """ Retrieve a dict of characters and escape codes with their real index into the string as the key. """

    codes = get_code_indices(s)
    if not codes:
        # This function is not for non-escape-code stuff, but okay.
        return {i: c for i, c in enumerate(s)}

    indices = {}
    for codeindex in sorted(codes):
        code = codes[codeindex]
        if codeindex == 0:
            indices[codeindex] = code
            continue
        # Grab characters before codeindex.
        start = max(indices or {0: ''}, key=int)
        startcode = indices.get(start, '')
        startlen = start + len(startcode)
        indices.update({i: s[i] for i in range(startlen, codeindex)})
        indices[codeindex] = code

    if not indices:
        return {i: c for i, c in enumerate(s)}
    lastindex = max(indices, key=int)
    lastitem = indices[lastindex]
    start = lastindex + len(lastitem)
    textlen = len(s)
    if start < (textlen - 1):
        # Grab chars after last code.
        indices.update({i: s[i] for i in range(start, textlen)})
    return indices