代码：

import pandas as pd

data = pd.read_csv(r"noise.csv")
print(data)

data1 = data.drop_duplicates(subset=['function_name'],keep='first')
print(data1)
data1.to_csv('noise.csv', index=0)
#index=0,不写入索引，很实用
#如果写入中文时有乱码，可以用utf-8-sig