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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 data_in_label(intvl_in, dtype_in_time, dtype_in_vert=False):
 """Create string label specifying the input data of a calculation."""

    intvl_lbl = intvl_in
    time_lbl = dtype_in_time
    lbl = '_'.join(['from', intvl_lbl, time_lbl]).replace('__', '_')
    vert_lbl = dtype_in_vert if dtype_in_vert else False
    if vert_lbl:
        lbl = '_'.join([lbl, vert_lbl]).replace('__', '_')
    return lbl