Question

我是烧瓶新手。我正在尝试创建两个上传请求： 1. 无论第一个文件都会保存 2. 如果我不上传第二个文件，它将帮助我生成 output.json。任何人都可以建议为什么我没有返回有效的回复？谢谢

TypeError：视图函数未返回有效响应。该函数要么返回 None 要么在没有返回语句的情况下结束。

路线：

@app.route('/upload', methods=['POST','GET'])
def upload():
if request.method == 'POST' and 'txt_data' in request.files:

    #Files upload and initiation
    num_sentences = int(request.form['num_sentences'])
    session["num_sentences"] = num_sentences
    uploaded_file = request.files['txt_data']
    filename = secure_filename(uploaded_file.filename)
    session["filename"] = filename 
    
    # save uploaded file
    if filename != '':
        uploaded_file.save(os.path.join(app.config['UPLOAD_PATH'], filename))

    text_file = open(os.path.join('uploads',filename), "r").read()
    nlp_file_doc = nlp(text_file)
    all_sentences = list(nlp_file_doc.sents)
    ongoing_sentences = all_sentences[num_sentences:]
    first_sentence = ongoing_sentences[0].text

    # Save output file 
    if 'output_data' in request.files:
        output_file = request.files['output_data']
        output_filename = secure_filename(output_file.filename)
        uploaded_file.save(os.path.join(app.config['OUTPUT_PATH'], output_filename))
    else:
        data = {first_sentence:[]}
        with open("output.json", "w") as write_file:
            json.dump(data, write_file)

    #Test out the first sentence
    extraction = apply_extraction(first_sentence, nlp)
    return render_template('annotation.html', 
                            all_sentences = all_sentences, 
                            extraction = extraction, num_sentences = num_sentences)

html：

<form method=POST enctype=multipart/form-data action="{{ url_for('upload') }}" class="form-group">
                    <div class="form-group">
                      <input type="file" name="txt_data">
   
                      <form method=POST enctype=multipart/form-data action="{{ url_for('upload') }}" class="form-group">
                        <div class="form-group">
                          <input type="file" name="output_data">
                        </form>

Answer 1

您的路由接受 GET 和 POST 两种方法，但仅在您有 POST 请求的情况下返回。

@app.route('/upload', methods=['POST','GET'])
def upload():
    if request.method == 'POST':
        ...
        return something
    # What happens here if the request.method is 'GET'?

如果您对 /upload 发出 GET 请求，则该函数将不返回任何内容，从而引发错误。

您可以删除 GET 方法或为 GET 案例返回一些内容。

解决方案 1：

@app.route('/upload', methods=['POST'])

解决方案 2：

@app.route('/upload', methods=['POST','GET'])
def upload():
    if request.method == 'POST':
        return something
    return something_else # if request.method == 'POST' returns false.

视图没有在烧瓶中返回响应

1 个答案: