Answers for "join two string columns pandas"

python merge strings in columns

df["period"] = df["Year"].astype(str) + df["quarter"]

merge two columns pandas

df["period"] = df["Year"] + df["quarter"]

pandas dataframe add two columns int and string

df = df['Day'].map(str) + '-' + df['Month'].map(str) + '-' + df['Year'].map(str)