drop_duplicates在pandas 中不起作用？

Question

我的代码的目的是导入2个Excel文件，对其进行比较，然后将差异打印到新的Excel文件中。

但是，在连接所有数据并使用该drop_duplicates功能之后，控制台将接受该代码。但是，当打印到新的excel文件时，重复副本仍会在当天保留。

我想念什么吗？是某种使drop_duplicates功能无效的东西吗？

我的代码如下：

import datetime
import xlrd
import pandas as pd
#identify excel file paths
filepath = r"excel filepath"
filepath2 = r"excel filepath2"
#read relevant columns from the excel files
df1 = pd.read_excel(filepath, sheetname="Sheet1", parse_cols= "B, D, G, O")
df2 = pd.read_excel(filepath2, sheetname="Sheet1", parse_cols= "B, D, F, J")
#merge the columns from both excel files into one column each respectively
df4 = df1["Exchange Code"] + df1["Product Type"] + df1["Product Description"] + df1["Quantity"].apply(str)
df5 = df2["Exchange"] + df2["Product Type"] + df2["Product Description"] + df2["Quantity"].apply(str)
#concatenate both columns from each excel file, to make one big column containing all the data
df = pd.concat([df4, df5])
#remove all whitespace from each row of the column of data
df=df.str.strip()
df=["".join(x.split()) for x in df] 
#convert the data to a dataframe from a series
df = pd.DataFrame({'Value': df}) 
#remove any duplicates
df.drop_duplicates(subset=None, keep="first", inplace=False)
#print to the console just as a visual aid
print(df)
#print the erroneous entries to an excel file
df.to_excel("Comparison19.xls")

Answer 1

您已经拥有了，inplace=False所以您没有进行修改df。你想要

 df.drop_duplicates(subset=None, keep="first", inplace=True)

要么

 df = df.drop_duplicates(subset=None, keep="first", inplace=False)