如何在Python中为唯一值赋值

df:

df_输出：

Id     Products
100     Shoes
101     Shoes
102     Shoes
103     Chair
104     Chair
105     Chair
106     Chair
107     Chair
108     Clothes
109     Clothes
110     Clothes

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我需要基于“产品”列创建一个新列，为每个不同的产品分配每个唯一的值。

使用

factorize

Id     Products Value
100     Shoes    1
101     Shoes    1
102     Shoes    1
103     Chair    2
104     Chair    2
105     Chair    2
106     Chair    2
107     Chair    2
108     Clothes  3
109     Clothes  3
110     Clothes  3

输出

df['Value']=df.Products.factorize()[0]+1

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使用

factorize

Id     Products Value
100     Shoes    1
101     Shoes    1
102     Shoes    1
103     Chair    2
104     Chair    2
105     Chair    2
106     Chair    2
107     Chair    2
108     Clothes  3
109     Clothes  3
110     Clothes  3

输出

df['Value']=df.Products.factorize()[0]+1