Parsing "aTimeLogger" Android app data to graphs using pandas

[Drone4four]

Toq uote myself from earlier:

# Create a DataFrame
python = bulk_df[bulk_df["Activity"] == "Python"] #.rolling(window=90).mean()

# Plotting
python.plot(x='From', y='Duration', kind='line', marker='o',figsize=(14, 8))

At line 2, when I invoke pandas' dt module to parse quarter years with this:

python = bulk_df[bulk_df["Activity"] == "Python"].dt.quarter

I get this traceback:

Error:
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/tmp/ipykernel_3152351/2962891946.py in ?()
      1 # Create a DataFrame
      2 # python = bulk_df[bulk_df["Activity"] == "Python"] #.rolling(window=90).mean()
----> 3 python = bulk_df[bulk_df["Activity"] == "Python"].dt.quarter
      4 
      5 # Plotting
      6 python.plot(x='From', y='Duration', kind='line', marker='o',figsize=(14, 8))

/usr/lib/python3.11/site-packages/pandas/core/generic.py in ?(self, name)
   5898             and name not in self._accessors
   5899             and self._info_axis._can_hold_identifiers_and_holds_name(name)
   5900         ):
   5901             return self[name]
-> 5902         return object.__getattribute__(self, name)

AttributeError: 'DataFrame' object has no attribute 'dt'