Python瓶没有返回cookie/ValueError:查看功能没有返回响应
我仍在努力将Python中的字符串传递给另一个函数。Python瓶没有返回cookie/ValueError:查看功能没有返回响应
我试图按照这里给出的例子:https://www.tutorialspoint.com/flask/flask_cookies.htm
我已经试过落实到我的代码,这但现在我得到以下回溯:
Traceback (most recent call last): File "/Users/marcel/tensorflow/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/Users/marcel/tensorflow/lib/python3.6/site-packages/flask/app.py", line 1615, in full_dispatch_request
return self.finalize_request(rv)
File "/Users/marcel/tensorflow/lib/python3.6/site-packages/flask/app.py", line 1630, in finalize_request
response = self.make_response(rv)
File "/Users/marcel/tensorflow/lib/python3.6/site-packages/flask/app.py", line 1725, in make_response
raise ValueError('View function did not return a response')
ValueError: View function did not return a response
这将意味着我我没有返回任何东西,但我真的不知道我要去哪里错了,我不得不承认我很迷茫。
我完整的代码看起来是这样的:
from __future__ import print_function import tensorflow as tf
import argparse
import os
from six.moves import cPickle
from model import Model
from six import text_type
import flask
from flask import jsonify, render_template, request, make_response
app = flask.Flask(__name__)
@app.route('/')
def index():
return render_template('index.html')
@app.route('/test')
def tester():
return "This is a test"
@app.route('/', methods = ['POST', 'GET'])
def main():
if request.method == 'POST':
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('--save_dir', type=str, default='save',
help='model directory to store checkpointed models')
parser.add_argument('-n', type=int, default=500,
help='number of characters to sample')
parser.add_argument('--prime', type=text_type, default=u' ',
help='prime text')
parser.add_argument('--sample', type=int, default=1,
help='0 to use max at each timestep, 1 to sample at '
'each timestep, 2 to sample on spaces')
args = parser.parse_args()
resp = make_response(render_template('sample.html'))
resp.set_cookie('args', args)
return resp
@app.route('/sampler', methods = ['POST', 'GET'])
def sample():
args = request.cookies.get('args')
with open(os.path.join(args.save_dir, 'config.pkl'), 'rb') as f:
saved_args = cPickle.load(f)
with open(os.path.join(args.save_dir, 'chars_vocab.pkl'), 'rb') as f:
chars, vocab = cPickle.load(f)
model = Model(saved_args, training=False)
with tf.Session() as sess:
tf.global_variables_initializer().run()
saver = tf.train.Saver(tf.global_variables())
ckpt = tf.train.get_checkpoint_state(args.save_dir)
if ckpt and ckpt.model_checkpoint_path:
saver.restore(sess, ckpt.model_checkpoint_path)
if request.method == 'POST':
text = model.sample(sess, chars, vocab, args.n, args.prime,
args.sample).encode('utf-8')
resp = make_response(render_template('text.html'))
resp.set_cookie('verse', text)
return resp
@app.route('/text')
def printer():
verse = request.cookies.get('verse')
return verse
@app.errorhandler(404)
def page_not_found(error):
return render_template('404.html'), 404
if __name__ == '__main__':
main()
之前,我曾试图刚刚从我的样本功能打印机功能发送Cookie,但它返回相同的错误。
我的代码之前:
def sample(args): with open(os.path.join(args.save_dir, 'config.pkl'), 'rb') as f:
saved_args = cPickle.load(f)
with open(os.path.join(args.save_dir, 'chars_vocab.pkl'), 'rb') as f:
chars, vocab = cPickle.load(f)
model = Model(saved_args, training=False)
with tf.Session() as sess:
tf.global_variables_initializer().run()
saver = tf.train.Saver(tf.global_variables())
ckpt = tf.train.get_checkpoint_state(args.save_dir)
if ckpt and ckpt.model_checkpoint_path:
saver.restore(sess, ckpt.model_checkpoint_path)
text = model.sample(sess, chars, vocab, args.n, args.prime,
args.sample).encode('utf-8')
resp = make_response(render_template('text.html'))
resp.set_cookie('verse', text)
return resp
@app.route('/text')
def printer():
verse = request.cookies.get('verse')
return verse
回答:
当verse
cookie的值不存在的价值verse
变量将变为None
。这意味着您的text
视图将返回None
,其中Flask
不喜欢并理解为“视图函数未返回响应”。
您可能需要妥善处理这种情况下 - 例如,简单地返回一个空字符串会解决这个问题(当然,这只是一个样本简单的解决方法来证明的差异):
@app.route('/text') def printer():
return request.cookies.get('verse', '')
而且,并非sample()
视图中的所有代码路径都会返回有效的响应 - 请确保解决该问题(例如,向sample()
视图发出GET
请求会导致相同的“视图函数未返回响应”错误) 。
回答:
在main
,你将需要外部的请求参数校验范围返回值:
@app.route('/', methods = ['POST', 'GET']) def main():
if request.method == 'POST':
parser = argparse.ArgumentParser(
....#statements follow
args = parser.parse_args()
resp = make_response(render_template('sample.html'))
resp.set_cookie('args', args)
return resp
return render_template('home.html') #need to return something here
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