How To Add String To All Values In A Column Of Pandas Dataframe

Say you have a DataFrame with columns; col_1 col_2 1 a 2 b 3 c 4 d 5 e how would you change the values of col_2 so that, new

Solution 1:

Use +:

df.col_2 = df.col_2 + 'new'print (df)
   col_1 col_2
0      1  anew
1      2  bnew
2      3  cnew
3      4  dnew
4      5  enew

Thanks hooy for another solution:

df.col_2 += 'new'

Or assign:

df = df.assign(col_2 = df.col_2 + 'new')
print (df)
   col_1 col_2
0      1  anew
1      2  bnew
2      3  cnew
3      4  dnew
4      5  enew