How to fill in rows with repeating data in pandas?

Question

In R, when adding new data of unequal length to a data frame, the values repeat to fill the data frame:

df <- data.frame(first=c(1,2,3,4,5,6))
df$second &         


        

Answer 1

How general of a solution are you looking for? I tried to make this a little less hard-coded:

import numpy as np
import pandas 

df = pandas.DataFrame(np.arange(1,7), columns=['first'])

base = [1, 2, 3]
df['second'] = base * (df.shape[0]/len(base))
print(df.to_string())


   first  second
0      1       1
1      2       2
2      3       3
3      4       1
4      5       2
5      6       3