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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 module_entry(yfile):
 """Add entry for one file containing YANG module text. Args: yfile (file):
 File containing a YANG module or submodule. """

    ytxt = yfile.read()
    mp = ModuleParser(ytxt)
    mst = mp.statement()
    submod = mst.keyword == "submodule"
    import_only = True
    rev = ""
    features = []
    includes = []
    rec = {}
    for sst in mst.substatements:
        if not rev and sst.keyword == "revision":
            rev = sst.argument
        elif import_only and sst.keyword in data_kws:
            import_only = False
        elif sst.keyword == "feature":
            features.append(sst.argument)
        elif submod:
            continue
        elif sst.keyword == "namespace":
            rec["namespace"] = sst.argument
        elif sst.keyword == "include":
            rd = sst.find1("revision-date")
            includes.append((sst.argument, rd.argument if rd else None))
    rec["import-only"] = import_only
    rec["features"] = features
    if submod:
        rec["revision"] = rev
        submodmap[mst.argument] = rec
    else:
        rec["includes"] = includes
        modmap[(mst.argument, rev)] = rec