df.drop_duplicates无法数据去重

原数据：
id,prouductColor,content
1,黑,裤子
2,白,短袖
3,蓝,牛仔裤
1,黑,裤子

import pandas as pd

file= pd.read_csv('testdata.csv',encoding="gbk")
df = pd.DataFrame(file)

print(df['content'])

df.drop_duplicates(subset=['id','content'], keep='first', inplace=False)

运行后内容没有做到去重

df=df.drop_duplicates(subset=['id','content'], keep='first', inplace=False)
或者df.drop_duplicates(subset=['id','content'], keep='first', inplace=True)

直接这样就行了不要加参数：
df.drop_duplicates()