How to Concatenate Two Columns in a Pandas DataFrame?

String Concatenation of Two Pandas Columns

Consider the following DataFrame:

from pandas import *
df = DataFrame({'foo':['a','b','c'], 'bar':[1, 2, 3]})

This DataFrame looks like:

bar	foo
1	a
2	b
3	c

To concatenate the values from the 'foo' and 'bar' columns into a single column, use the following code:

df['bar'] = df.bar.map(str) + " is " + df.foo

The result is:

bar

1 is a

2 is b

3 is c

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