另外一个建议。
您可以同时利用nosetests和pdb，而不是手动在视图中注入pdb.set_trace()。这样做的好处是，您可以在错误条件第一次启动时观察到它们，可能是在第三方代码中。
这是我今天的一个错误。
TypeError at /db/hcm91dmo/catalog/records/
render_option() argument after * must be a sequence, not int
....
Error during template rendering
In template /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/crispy_forms/templates/bootstrap3/field.html, error at line 28
render_option() argument after * must be a sequence, not int
18
19 {% if field|is_checkboxselectmultiple %}
20 {% include 'bootstrap3/layout/checkboxselectmultiple.html' %}
21 {% endif %}
22
23 {% if field|is_radioselect %}
24 {% include 'bootstrap3/layout/radioselect.html' %}
25 {% endif %}
26
27 {% if not field|is_checkboxselectmultiple and not field|is_radioselect %}
28
{% if field|is_checkbox and form_show_labels %}
现在，我知道这意味着我把表单的构造函数弄糊涂了，我甚至很清楚哪个字段有问题。但是，我可以使用pdb看到脆皮的形式是抱怨，在一个模板?
是的，我会。在nosetests上使用——pdb选项:
测试$ nosetests test_urls_catalog.py——pdb
一旦我碰到任何异常(包括优雅地处理的异常)，pdb就会停止，我可以四处查看。
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py", line 537, in __str__
return self.as_widget()
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/forms.py", line 593, in as_widget
return force_text(widget.render(name, self.value(), attrs=attrs))
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/widgets.py", line 513, in render
options = self.render_options(choices, [value])
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/widgets.py", line 543, in render_options
output.append(self.render_option(selected_choices, *option))
TypeError: render_option() argument after * must be a sequence, not int
INFO lib.capture_middleware log write_to_index(http://localhost:8082/db/hcm91dmo/catalog/records.html)
INFO lib.capture_middleware log write_to_index:end
> /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/forms/widgets.py(543)render_options()
-> output.append(self.render_option(selected_choices, *option))
(Pdb) import pprint
(Pdb) pprint.PrettyPrinter(indent=4).pprint(self)
<django.forms.widgets.Select object at 0x115fe7d10>
(Pdb) pprint.PrettyPrinter(indent=4).pprint(vars(self))
{ 'attrs': { 'class': 'select form-control'},
'choices': [[('_', 'any type'), (7, (7, 'type 7', 'RECTYPE_TABLE'))]],
'is_required': False}
(Pdb)
现在，很明显，我对crispy field构造函数的choices参数是一个列表中的列表，而不是元组中的list/tuple。
'choices': [[('_', 'any type'), (7, (7, 'type 7', 'RECTYPE_TABLE'))]]
整洁的事情是，这个pdb发生在脆皮的代码，而不是我的，我不需要手动插入它。
