convert non categorical to categorical values in pandas code example

Example 1: transform categorical variables python

from sklearn.preprocessing import LabelEncoder

lb_make = LabelEncoder()
obj_df["make_code"] = lb_make.fit_transform(obj_df["make"])
obj_df[["make", "make_code"]].head(11)

Example 2: how to make a column a factor in pandas

df['col_name'] = df['col_name'].astype('category')