duration    start_date  start_year  start_month start_hour  weekday start_city  end_city    subscription_type
0   1.050000    2013-08-29  2013    8   14  3   San Francisco   San Francisco   Subscriber
1   1.166667    2013-08-29  2013    8   14  3   San Jose    San Jose    Subscriber
2   1.183333    2013-08-29  2013    8   10  3   Mountain View   Mountain View   Subscriber
3   1.283333    2013-08-29  2013    8   11  3   San Jose    San Jose    Subscriber
4   1.383333    2013-08-29  2013    8   12  3   San Francisco   San Francisco   Subscriber

viagem_por_tipo = trip_data.groupby(['subscription_type'],['weekday'])['start_year'].count()
viagem_por_tipo.plot.bar()

TypeError                                 Traceback (most recent call last)
<ipython-input-40-4b3318e38ba7> in <module>()
----> 1 viagem_por_tipo = trip_data.groupby(['subscription_type'],['weekday'])['start_year'].count()
      2 viagem_por_tipo.plot.bar()

C:UsersMichel SpieroAnaconda3libsite-packagespandascoregeneric.py in groupby(self, by, axis, level, as_index, sort, group_keys, squeeze, **kwargs)
   4266         if level is None and by is None:
   4267             raise TypeError("You have to supply one of 'by' and 'level'")
-> 4268         axis = self._get_axis_number(axis)
   4269         return groupby(self, by=by, axis=axis, level=level, as_index=as_index,
   4270                        sort=sort, group_keys=group_keys, squeeze=squeeze,

C:UsersMichel SpieroAnaconda3libsite-packagespandascoregeneric.py in _get_axis_number(self, axis)
    339
    340     def _get_axis_number(self, axis):
--> 341         axis = self._AXIS_ALIASES.get(axis, axis)
    342         if is_integer(axis):
    343             if axis in self._AXIS_NAMES:

TypeError: unhashable type: 'list'