Flask文档的“样式”部分介绍了将文件流传输到客户端而不将其保存到磁盘的过程，特别是在流传输部分。基本上，您要做的是返回一个Response包装了迭代器的完整对象：
from flask import Response
# construct your app
@app.route("/get-file")
def get_file():
results = generate_file_data()
generator = (cell for row in results
for cell in row)
return Response(generator,
mimetype="text/plain",
headers={"Content-Disposition":
"attachment;filename=test.txt"})
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