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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 parse_docs(docs, marks):
 """ Parse YAML syntax content from docs If docs is None, return {} If docs has no YAML content, return {"$desc": docs} Else, parse YAML content, return {"$desc": docs, YAML} Args: docs (str):
 docs to be parsed marks (list):
 list of which indicate YAML content starts Returns: A dict contains information of docs """

    if docs is None:
        return {}
    indexs = []
    for mark in marks:
        i = docs.find(mark)
        if i >= 0:
            indexs.append(i)
    if not indexs:
        return {"$desc": textwrap.dedent(docs).strip()}
    start = min(indexs)
    start = docs.rfind("\n", 0, start)
    yamltext = textwrap.dedent(docs[start + 1:])
    meta = yaml.load(yamltext)
    meta["$desc"] = textwrap.dedent(docs[:start]).strip()
    return meta