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

The cycle method from itertools is good for repeating a common pattern.

from itertools import cycle

seq = cycle([1, 2, 3])
df['Seq'] = [next(seq) for count in range(df.shape[0])]