It looks like a conversion mode problem. "df" in your example is
converted back into a Python dict as soon as it's created, so when
you pass it to r.is_data_frame(), R doesn't know what it is. Try the
following:
df = with_mode(NO_CONVERSION, r.data_frame) \
(timeDataFrame["utility"], \
timeDataFrame["target"], \
timeDataFrame["build"], \
timeDataFrame["timeType"], \
timeDataFrame["time"])
r.print_(r.is_data_frame(df))
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