In [1]:

    

import pandas as pd
df = pd.DataFrame([['AA', 1], ['BB', 2], ['CC', 3]], columns=['name', 'value'])


    

In [2]:

    

df


    

    
Out[2]:






  

    

      

      
name
      
value
    
  
  

    

      
0
      
AA
      
1
    
    

      
1
      
BB
      
2
    
    

      
2
      
CC
      
3
    
  

In [3]:

    

def function_1(val_1):
    return "prefix_" + str(val_1)


    

In [4]:

    

df['name'] = df['name'].map(function_1)


    

In [5]:

    

df


    

    
Out[5]:






  

    

      

      
name
      
value
    
  
  

    

      
0
      
prefix_AA
      
1
    
    

      
1
      
prefix_BB
      
2
    
    

      
2
      
prefix_CC
      
3
    
  

In [ ]: