TypeError: unhashable type: 'set' in Flask Form 上传文件

Question

我正在尝试从 Flask 中的表单中获取数据，该表单也有一个文件：

app.py

@app.route('/newProjectCreation/', methods=['GET', 'POST'])
def newProjectCreation():
    try:
        if request.method == 'POST':
            # Data Fetch from Models Form
            name = request.form['modelName']
            modelDescription = request.form['modelDescription']
            inputType = request.form.getlist['inputType[]']
            outputType = request.form.getlist['outputType[]']
            model = request.files['model']      # file
            modelLanguage = request.form['modelLanguage']

HTML

它是一个简单的表单（不是Flask-WTF表单）并且正在上传一个文件（这里opencv.png是上传的文件）。

错误：

您尝试访问 request.files 字典中的文件“模型”，但它不存在。请求的 mimetype 是“application/x-www-form-urlencoded”而不是“multipart/form-data”，这意味着没有传输文件内容。要修复此错误，您应该在表单中提供 enctype="multipart/form-data"。

The browser instead transmitted some file names. This was submitted: "opencv.png"
127.0.0.1 - - [11/May/2021 05:24:05] "POST /newProjectCreation HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1926, in dispatch_request
    self.raise_routing_exception(req)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1912, in raise_routing_exception
    raise FormDataRoutingRedirect(request)

flask.debughelpers.FormDataRoutingRedirect: b'请求已发送到此 URL (http://127.0.0.1:5000/newProjectCreation)，但路由系统自动发出重定向到“http://127.0.0.1:5000/newProjectCreation/”。 URL 是用斜杠定义的，因此如果在没有斜杠的情况下访问它，Flask 将自动重定向到带有斜杠的 URL。请确保将您的 POST 请求直接发送到此 URL，因为我们无法使浏览器或 HTTP 客户端使用表单数据可靠地重定向或无需用户交互。\n\n注意：此异常仅在调试模式下引发'

127.0.0.1 - - [11/May/2021 05:24:05] "POST /newProjectCreation HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1926, in dispatch_request
    self.raise_routing_exception(req)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1912, in raise_routing_exception
    raise FormDataRoutingRedirect(request)

flask.debughelpers.FormDataRoutingRedirect: b'请求已发送到此 URL (http://127.0.0.1:5000/newProjectCreation)，但路由系统自动发出重定向到“http://127.0.0.1:5000/newProjectCreation/”。 URL 是用斜杠定义的，因此如果在没有斜杠的情况下访问它，Flask 将自动重定向到带有斜杠的 URL。请确保将您的 POST 请求直接发送到此 URL，因为我们无法使浏览器或 HTTP 客户端使用表单数据可靠地重定向或无需用户交互。\n\n注意：此异常仅在调试模式下引发'

127.0.0.1 - - [11/May/2021 05:24:05] "POST /newProjectCreation/ HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/debughelpers.py", line 96, in __getitem__
    return oldcls.__getitem__(self, key)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/werkzeug/datastructures.py", line 442, in __getitem__
    raise exceptions.BadRequestKeyError(key)
werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/adiagarwal/fantastic-computing-machine/flaskapp-docker/flaskapp/app.py", line 108, in newProjectCreation
    model = request.files['model']
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/debughelpers.py", line 100, in __getitem__
    raise DebugFilesKeyError(request, key)

flask.debughelpers.DebugFilesKeyError：您尝试访问 request.files 字典中的文件“模型”，但它不存在。请求的 mimetype 是“application/x-www-form-urlencoded”而不是“multipart/form-data”，这意味着没有传输文件内容。要修复此错误，您应该在表单中提供 enctype="multipart/form-data"。

浏览器转而传输了一些文件名。这是提交的：“opencv.png”

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/adiagarwal/fantastic-computing-machine/env/lib/python3.8/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/adiagarwal/fantastic-computing-machine/flaskapp-docker/flaskapp/app.py", line 129, in newProjectCreation
    return {{e}}
TypeError: unhashable type: 'set'

本人没有 js 方面的经验，正在学习中，如有可能请简化回答。

提前谢谢你。

Answer 1

在您的退货声明中，您使用的是“{{}}”，只需将其删除即可。 应该是这样的

return e