从 python (flask) 网络服务向浏览器提供文件

Question

我有一个 python 网络服务，它应该从浏览器接收 GET 请求，将一些数据写入 csv 文件并将其返回给浏览器。

我正在努力完成最后一步。如何将文件返回给浏览器？有没有办法在不在服务器上创建或保留 csv 文件的情况下做到这一点？

@app.route('/', methods = ['GET'])
def get_file():

        alldata = []

        while len(new_data) > 0:
                new_data = api.timeline(max_id=oldest)
                alldata.extend(new_data)
                oldest = alldata[-1].id - 1    
        outdata = [[info.id_str] for data in alldata]

        #write the csv
        with open('data.csv', 'wb') as f:
                writer = csv.writer(f)
                writer.writerows(outdata)
        pass

if __name__ == '__main__':
  app.run(host = app.config['HOST'], port = app.config['PORT'])

Answer 1

您可以 return 像这样

而不是将文件写入磁盘：

from flask import make_response

outdata = ""

for data in alldata:
    outdata += ",".join(data) + "\n"

response = make_response(outdata)
response.headers["Content-Disposition"] = "attachment; filename=data.csv"

return response

或者，如果您确实想将文件写入磁盘，您可以使用 send_from_directory:

return send_from_directory('my_app', 'data.csv')

从 python (flask) 网络服务向浏览器提供文件

Serve file to browser from python (flask) webservice

python

io

web-services

flask