pandas 标签映射成数值的几种方法

2024-08-30 21:05:51

1.

preprocessing.LabelEncoder()

import pandas as pd

from sklearn import preprocessing

le = preprocessing.LabelEncoder()

ddf = pd.DataFrame({"id":[1,2,3,1],"name":["a","b","c","a"],"age":[7,8,9,10]})

ddf[["id","name"]] = ddf[["id","name"]].fillna(0)

k = le.fit_transform(ddf["name"])

ddf["name"] = k

ddf

2.

ddf["name"] = ddf["name"].astype("category").cat.codes

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