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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 maybe_infer_freq(freq):
 """ Comparing a DateOffset to the string "infer" raises, so we need to be careful about comparisons. Make a dummy variable `freq_infer` to signify the case where the given freq is "infer" and set freq to None to avoid comparison trouble later on. Parameters freq : {DateOffset, None, str} Returns ------- freq : {DateOffset, None} freq_infer : bool """

    freq_infer = False
    if not isinstance(freq, DateOffset):
        # if a passed freq is None, don't infer automatically
        if freq != 'infer':
            freq = frequencies.to_offset(freq)
        else:
            freq_infer = True
            freq = None
    return freq, freq_infer