完成功能时找不到临时文件

Question

我正在尝试创建一个临时文件，写入它，然后从我的烧瓶应用程序下载它。但是，我在完成该功能时收到 FileNotFoundError。这是我的代码和收到的错误。提前致谢。

    with tempfile.TemporaryFile (mode='w', newline="", dir=".", suffix='.csv') as csvfilenew:
        writer = csv.writer(csvfilenew, delimiter= ';')
        myClick()
        return send_file(str(csvfilenew.name), as_attachment=True, attachment_filename='cleanfile.csv')

FileNotFoundError: [Errno 2] No such file or directory: '/Desktop/bulk_final/10'

Answer 1

当询问名称属性时，

TemporaryFile 不是 return 有效的文件描述符。您可以使用 NamedTemporaryFile 来询问姓名。

from flask import send_file
import tempfile
import csv

@app.route('/download')
def download():
    with tempfile.NamedTemporaryFile(mode='w', newline='', dir='.', suffix='.csv') as csvfilenew:
        writer = csv.writer(csvfilenew, delimiter= ';')
        writer.writerow(['Spam', 'Lovely Spam', 'Wonderful Spam'])
        csvfilenew.flush()
        csvfilenew.seek(0)
        return send_file(csvfilenew.name,
            as_attachment=True,
            attachment_filename='cleanfile.csv'
        )

另一个针对少量数据的简单解决方法如下：

from flask import send_file
import csv
import io

@app.route('/download')
def download():
    with io.StringIO() as doc:
        writer = csv.writer(doc, delimiter= ';')
        writer.writerow(['Spam', 'Lovely Spam', 'Wonderful Spam'])
        doc.seek(0)
        return send_file(io.BytesIO(doc.read().encode('utf8')),
            as_attachment=True,
            attachment_filename='cleanfile.csv'
        )

完成功能时找不到临时文件

Tempfile not found when finishing function

python

flask

backend

python-3.7

temporary-files