How to modify using pandas to cell merge

This original data Before:

| 0 | name | age | sex |
| 1 | jan  | 30  | M  |
| 2 | job | address |
| 3 | yes | 42424   | 
| 4 | name| age | sex |
| 5 | jan |  30 |  M  |
| 6 | job | address |
| 7 | yes | 42424   | 
| 8 | name| age | sex |
| 9 | jan |  30 |  M  |
|10 | job | address |
|11 | yes | 42424   | 

After:

| 0 | name | age | sex | job | address |
| 1 | jan  | 30  |  M  | yes | 42424   |
| 2 | jan  | 30  |  M  | yes | 42424   |
| 3 | jan  | 30  |  M  | yes | 42424   |

I want to change the cells using the Python code with the help of pandas. Please help me with this. Thank you.