How can I reshape a table with Pandas

I need to reshape a single column table with the next format:

to the format:
| Category | value |
|—–|——-|
| foo | 10 |
| bar | 30 |
| baz | 20 |

I kinda know how to use pandas pivot and pandas melt, but for some reason, it’s not working with my table.
I made the table extracting a single row from a bigger one containing more years.

>Solution :

Simply calling pd.melt on your data works for me, with pandas version 1.4.3

df = pd.DataFrame({
    "Year": [1999],
    "foo": [10],
    "bar": [30],
    "baz": [20],
})
pd.melt(df)

Outputs:

  variable  value
0     Year   1999
1      foo     10
2      bar     30
3      baz     20