I have table like below

```
Column 1 Column 2 Column 3 ...
0 a 1 2
1 b 1 3
2 c 2 1
```

and I want to convert it to be like below

```
Column 1 Column 2
0 a 1
1 a 2
2 b 1
3 b 3
4 c 2
5 c 1
...
```

I want to take each value from Column 2 (and so on) and pair it to value in column 1. I have no idea how to do it in pandas or even where to start.

### >Solution :

You can use pd.melt to do this:

```
>>> df = pd.DataFrame({'A': {0: 'a', 1: 'b', 2: 'c'},
... 'B': {0: 1, 1: 3, 2: 5},
... 'C': {0: 2, 1: 4, 2: 6}})
>>> df
A B C
0 a 1 2
1 b 3 4
2 c 5 6
>>> pd.melt(df, id_vars=['A'], value_vars=['B', 'C'])
A variable value
0 a B 1
1 b B 3
2 c B 5
3 a C 2
4 b C 4
5 c C 6
```