基于Python flask web上传下载文件

#!/usr/bin/env python3
#-*- coding:utf-8 -*-

import os,sys
from flask import Flask,render_template,request,send_file,send_from_directory

app=Flask(__name__)
BASE_PATH=os.path.dirname(os.path.abspath(__file__))

@app.route("/upload",methods=["POST"])
def upload_file():
    try:
        f=request.files["file"]
        filename = os.path.join(BASE_PATH,"upload",f.filename)
        print(filename)
        f.save(filename)
        return "file upload successfully!"
    except Exception as e:
        return "failed!"

@app.route("/download/<filename>",methods=["GET"])
def download_file(filename):
    dir = os.path.join(BASE_PATH,‘download‘)
    return send_from_directory(dir,filename,as_attachment=True)
    
def mkdir(dirname):
    dir = os.path.join(BASE_PATH,dirname)
    if not os.path.exists(dir):
        os.makedirs(dir)
    
if   __name__ == "__main__":
    mkdir(‘download‘)
    mkdir(‘upload‘)
    app.run(host="0.0.0.0",port=8000,debug=False)