python之值错误 : Type names and field names must be valid identifiers: namedtuple

我在 flask View 函数中有以下内容(_我使用的是 python 3.6):

@login_required 
@main.route('/dashboard', methods=['GET', 'POST']) 
def dashboard(): 
    if request.method =='POST': 
        dash_data = namedtuple('dash_data',[('posting', str), ('folder', str)]) 
        print(request.form.get('posting')) 
 
        posted_data= dash_data(posting=request.form.get('posting'),folder=request.form.get('folder')) 

我得到:

  Traceback (most recent call last): 
  File "...\lib\site-packages\flask\app.py", line 1997, in __call__ 
    return self.wsgi_app(environ, start_response) 
  File "...\lib\site-packages\flask\app.py", line 1985, in wsgi_app 
    response = self.handle_exception(e) 
  File "...\lib\site-packages\flask\app.py", line 1540, in handle_exception 
    reraise(exc_type, exc_value, tb) 
  File "...\lib\site-packages\flask\_compat.py", line 33, in reraise 
    raise value 
  File "...\lib\site-packages\flask\app.py", line 1982, in wsgi_app 
    response = self.full_dispatch_request() 
  File "...\lib\site-packages\flask\app.py", line 1614, in full_dispatch_request 
    rv = self.handle_user_exception(e) 
  File "...\lib\site-packages\flask\app.py", line 1517, in handle_user_exception 
    reraise(exc_type, exc_value, tb) 
  File "...\lib\site-packages\flask\_compat.py", line 33, in reraise 
    raise value 
  File "...\lib\site-packages\flask\app.py", line 1612, in full_dispatch_request 
    rv = self.dispatch_request() 
  File "...\lib\site-packages\flask\app.py", line 1598, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
  File "E:\ENVS\r3\posterizer2\app\main\views.py", line 387, in cl_dash 
    Cl_dash_data = namedtuple('cl_dash_data',[('posting', str), ('folder', str)]) 
  File "...\lib\collections\__init__.py", line 403, in namedtuple 
    'identifiers: %r' % name) 
ValueError: Type names and field names must be valid identifiers: "('posting', <class 'str'>)" 

我做错了什么？

请您参考如下方法:

namedtuple 对象不接受 (attribute, type) 元组列表，它们只需要一个可迭代的属性(或单个字符串):

namedtuple('dash_data', ('posting', 'folder')) 

或者:

namedtuple('dash_data', 'posting folder') 

引用the documentation了解如何使用 namedtuple。