txt2 = """cars,flowers,countries,vegetables
Audi,Rose,Spain,Carrots
BMW,Tulip,Nigeria,Celery
Honda,Dandelion,Egypt,Onion"""
df = pd.read_csv(StringIO(txt1))
df2 = pd.read_csv(StringIO(txt2))
Comparing two DataFrames by one column with a return of three different outputs with Panadas