pandas合并多个csv文件

Posted 2020-11-25 levylaw

import pandas as pd
import os

#文件路径注意用\\
inputfilepath = ‘C:\\Users\\Administrator\\AAA\\BBB\\‘
outputfilepath = ‘C:\\Users\\Administrator\\AAA\\‘
df_filename = ‘file_8_27-11_19.csv‘
columns_list = [‘id‘, ‘Code‘, ‘Name‘, ‘update_time‘]

#先创建一个只有表头列名的空dataframe，保存为csv
df = pd.DataFrame(columns = columns_list)
df.to_csv(outputfilepath + df_filename)

#遍历输入路径文件夹，用pandas读取后追加在目标csv文件中
for inputfile in os.listdir(inputfilepath):
    df = pd.read_csv(inputfilepath+inputfile)
    df.to_csv(outputfilepath + df_filename, mode=‘a‘, index=True,header = False)

#查看合并后的表格
pd.read_csv(outputfilepath + df_filename)