Create Catagorical data types in Pandas

• Create a categorical data type within a series.

s = pd.Series(["a","b","c","a", dtype = "category")

• By converting an existing series or column to a category dtype.

df = pd.DataFrame({"A":["a", "b", "c", "a"]})

df["B"] = df["A"].astype('category')

• Create a specific Categorical data type

raw_cat = pd.Categorical(["a", "b", "c", "a"], categories =["b", "c", "d"], ordered=False)

s = pd.Series(raw_cat)

For more information go to: This pandas link