


# Reindex without fill method: ts3
ts3 = ts2.reindex(ts1.index)

# Reindex with fill method, using forward fill: ts4
ts4 = ts2.reindex(ts1.index,method="ffill")

# Combine ts1 + ts2: sum12
sum12 = ts1+ts2

# Combine ts1 + ts3: sum13
sum13 = ts1+ts3

# Combine ts1 + ts4: sum14
sum14 = ts1+ts4
