如何将字符串添加到 Pandas DataFrame 列中的所有值？

How to add string to all values in a column of pandas DataFrame?

提问by mystery man

Say you have a DataFramewith columns;

假设你有一个DataFrame列；

 col_1    col_2 
   1        a
   2        b
   3        c
   4        d
   5        e

how would you change the values of col_2so that, new value= current value+ 'new'

您将如何更改的值，col_2以便新值=当前值+'new'

回答by jezrael

Use +:

使用+：

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 hooyfor another solution:

感谢hooy提供另一种解决方案：

df.col_2 += 'new'

Or assign:

或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