Given the following dataframe, write code using Python Pandas to return the rows that contain the string 'J' in the 'name' column (to practice searching string contains).
Next, write code to return all rows where 'favorite_color' does not contain the string 'r'.
| Age | Favorite Color | Grade | Name |
|---|---|---|---|
| 20 | blue | 88 | Willard Morris |
| 19 | blue | 95 | Al Jennings |
| 22 | yellow | 92 | Omar Mullins |
| 21 | green | 70 | Spencer McDaniel |