爬虫--文件的下载

from flask import *
app=Flask(__name__)
@app.route('/')
def index():
    if  not "fileName" in request.values:
        s="图像.jpg"
        return s
    else:
        fileName=request.values.get("fileName")
        f=open(fileName,"rb")
        data=f.read()
        f.close()
        return data


if __name__=='__main__':
    app.run(port=5000,debug=True)
from flask import *
app=Flask(__