In [1]:

    

import pandas as pd
from pandas import DataFrame, Series


    

In [2]:

    

df1 = DataFrame({'a':['one','two','three','four','five'],'b':[1,2,3,4,5],'c':[10,20,30,40,50]})


    

In [3]:

    

df1


    

    
Out[3]:






  

    

      

      
a
      
b
      
c
    
  
  

    

      
0
      
one
      
1
      
10
    
    

      
1
      
two
      
2
      
20
    
    

      
2
      
three
      
3
      
30
    
    

      
3
      
four
      
4
      
40
    
    

      
4
      
five
      
5
      
50
    
  

In [4]:

    

df1 = pd.melt(df1, id_vars='a', value_vars=['b','c'])


    

In [5]:

    

df1


    

    
Out[5]:






  

    

      

      
a
      
variable
      
value
    
  
  

    

      
0
      
one
      
b
      
1
    
    

      
1
      
two
      
b
      
2
    
    

      
2
      
three
      
b
      
3
    
    

      
3
      
four
      
b
      
4
    
    

      
4
      
five
      
b
      
5
    
    

      
5
      
one
      
c
      
10
    
    

      
6
      
two
      
c
      
20
    
    

      
7
      
three
      
c
      
30
    
    

      
8
      
four
      
c
      
40
    
    

      
9
      
five
      
c
      
50