python合并俩列Series

import pandas as pd

import csv

path='test.csv'

data=pd.read_csv(path)

x=data['label']

xt=x.drop_duplicates( keep='first', inplace=False)

path1='val.csv'

data1=pd.read_csv(path1)

x1=data1['label']

xv=x1.drop_duplicates( keep='first', inplace=False)

xt=xt.to_frame()

xv=xv.to_frame()

w=pd.concat([xt, xv], axis=0)