### Dataframes ### Accessing Data in a Dataframe 1. Square Brackets Method (`df['column_name']`): 2. Dot Notation Method (`df.column_name`): ### Data Cleansing in Dataframes #### Handling Nulls - `df.dropna()` - `df.fillna()` ### Data Manipulation #### Sorted Data in a Dataframe - `df.sort_values() ```python df_sorted = df.sort_values(by='A') print("1. sort_values():") print(df_sorted) ```