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

Probably inefficient, but here's sort of a pure pandas solution.

import numpy as np
import pandas as pd

base = [1,2,3]
df = pd.DataFrame(data = None,index = np.arange(10),columns = ["filler"])
df["filler"][:len(base)] = base

df["tmp"] = np.arange(len(df)) % len(base)
df["filler"] = df.sort_values("tmp")["filler"].ffill() #.sort_index()
print(df)