Combine two columns of text in pandas dataframe

Question

I have a 20 x 4000 dataframe in Python using pandas. Two of these columns are named Year and quarter. I\'d like to create a variable called p

Answer 1

One can use assign method of DataFrame:

df= (pd.DataFrame({'Year': ['2014', '2015'], 'quarter': ['q1', 'q2']}).
  assign(period=lambda x: x.Year+x.quarter ))