mlprod:categorical.py

# You have you set of possible categories in a list for example.
# (it could be anything really...)
possible_categories = ['foo', 'bar]

# Convert the categorical column to type Categorical
df['categorical_column'] = pd.Categorical(
  values=df['categorical_column'],
  categories=possible_categories
)
                       
dummies = pd.get_dummies(df['categorical_column'])