如何在python中修复'TypeError：'function'类型的参数不可迭代'答案

【问题标题】：How to fix 'TypeError: argument of type 'function' is not iterable' in python如何在python中修复'TypeError：'function'类型的参数不可迭代'
【发布时间】：2019-05-15 11:17:36
【问题描述】：

我正在制作一个可以发送和接收电子邮件的 django 应用程序。对于 django 应用程序，我正在编写 views.py 的代码运行文件后，我遇到了这个错误。这是我的 django 应用程序中的 views.py

from django.shortcuts import render
from django.contrib import messages
from django.core.mail import send_mail
#from demoapp.form import ContactForm


# Create your views here.

def index(request):
    return render(request,'index.html',{'page':'home'})


def contact(request):
    try:
        if request.method == 'POST':
            form = ContactForm(request.POST)
            if form.is_valid():
                send_mail(form.cleaned_data)
                messages.success(request,'Your message is successfully submitted')

        else:
            form = ContactForm()

    except:
        messages.error(request,'contact.html',{'page':'contact','form':form})

def clear(request):
    form = ContactForm()
    messages.error(request,'Fields Cleared')
    return render(request,'contact.html',{'page':'contact','form':form})

Urls.py 这个 urls.py 来自 django 项目。我还没有为我的应用创建任何 urls.py。

from django.contrib import admin
from django.urls import path
from django.conf.urls import url
from demoapp.views import index,about,contact,clear
urlpatterns = [
    path('admin/', admin.site.urls),
    url(r'^$' , index , name=index),
    url(r'^about/$' , about , name=about),
    url(r'^contact/$' , contact , name=contact),
    url(r'^clear/$' , clear , name=clear),


]

运行 python3 manage.py runserver 后出现以下错误


Watching for file changes with StatReloader
Performing system checks...

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.6/dist-packages/django/utils/autoreload.py", line 54, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/commands/runserver.py", line 117, in inner_run
    self.check(display_num_errors=True)
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/base.py", line 390, in check
    include_deployment_checks=include_deployment_checks,
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/base.py", line 377, in _run_checks
    return checks.run_checks(**kwargs)
  File "/usr/local/lib/python3.6/dist-packages/django/core/checks/registry.py", line 72, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/usr/local/lib/python3.6/dist-packages/django/core/checks/urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "/usr/local/lib/python3.6/dist-packages/django/core/checks/urls.py", line 23, in check_resolver
    return check_method()
  File "/usr/local/lib/python3.6/dist-packages/django/urls/resolvers.py", line 399, in check
    messages.extend(check_resolver(pattern))
  File "/usr/local/lib/python3.6/dist-packages/django/core/checks/urls.py", line 23, in check_resolver
    return check_method()
  File "/usr/local/lib/python3.6/dist-packages/django/urls/resolvers.py", line 325, in check
    warnings = self._check_pattern_name()
  File "/usr/local/lib/python3.6/dist-packages/django/urls/resolvers.py", line 333, in _check_pattern_name
    if self.pattern.name is not None and ":" in self.pattern.name:
TypeError: argument of type 'function' is not iterable

【问题讨论】：

你能添加你的 urls.py 吗？
您的urls.py 可能有问题。
您的代码中是否有一个名为 name 的函数？
clear 视图也有点“奇怪”。人们通常不会通过视图来做到这一点。通常这是在 HTML/JavaScript 中完成的。
还要注意contact 永远不会返回响应。

标签： python django python-3.x

【解决方案1】：

您的names 不是字符串，而是对视图函数的引用。您应该改用字符串，例如：

urlpatterns = [
    path('admin/', admin.site.urls),
    url(r'^$' , index , name='index'),
    url(r'^about/$' , about , name='about'),
    url(r'^contact/$' , contact , name='contact'),
    url(r'^clear/$' , clear , name='clear'),
]

所以我们在这里使用 字符串字面量 'index' 而不是 index 标识符，它只是引用视图函数。

【讨论】：