creating vector from df.intertuples

[Richard Medina]

I want to create a vector from a dataframe in a loop. Then I want to create a new column from this vector.

    for row in df.itertuples():
        mm  = str(row.t)  #selecting "t" column
        nn = get_sec(mm) #this function converts time to seconds
        df["s"] = nn #I want to add my new vector to a new "s" column in my df
    print(df.head())    #only gives me the last number in the "nn" column.


Any help is appreciated.
Thank you.