为什么 inspect.getsource 不返回整个类源？

Question

我的forms.py 中有此代码：

from django import forms
from formfieldset.forms import FieldsetMixin


class ContactForm(forms.Form, FieldsetMixin):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)

    fieldsets = ((u'Personal Information',
                {'fields': ('full_name', 'email', 'website'),
                'description': u'Your personal information will not ' \
                                u'be shared with 3rd parties.'}),
                (None,
                {'fields': ('message',),
                'description': u'All HTML will be stripped out.'}),
                (u'Preferences',
                {'fields': ('send_notification',)}))

当我尝试使用inspect 以编程方式提取代码时，它忽略了fieldsets：

In [1]: import inspect

In [2]: import forms

In [3]: print inspect.getsource(forms)
from django import forms
from formfieldset.forms import FieldsetMixin


class ContactForm(forms.Form, FieldsetMixin):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)

    fieldsets = ((u'Personal Information',
                {'fields': ('full_name', 'email', 'website'),
                'description': u'Your personal information will not ' \
                                u'be shared with 3rd parties.'}),
                (None,
                {'fields': ('message',),
                'description': u'All HTML will be stripped out.'}),
                (u'Preferences',
                {'fields': ('send_notification',)}))

In [4]: print inspect.getsource(forms.ContactForm)
class ContactForm(forms.Form, FieldsetMixin):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)


In [5]:      

这似乎不是空行的问题。我已经在没有空行的情况下进行了测试，并且在其他属性之间添加了额外的空行。结果不会改变。

任何想法为什么检查只返回fieldsets 之前的部分而不是类的整个源？

Answer 1

编辑：根据 cmets 修改：

在inspect.getsource(forms.ContactForm) 内部，BlockFinder.tokeneater() 方法用于确定ContactForm 块停止的位置。除此之外，它还会检查 tokenize.DEDENT，它会在存储在 github 的版本中的字段集之前找到它。该行仅包含一个换行符，因此inspect 认为当前块已结束。

如果你插入 4 个空格，它又对我有用。我无法争论这背后的基本原理，也许是性能。

class ContactForm(forms.Form):
    full_name = forms.CharField(max_length=120)
    email = forms.EmailField()
    website = forms.URLField()
    message = forms.CharField(max_length=500, widget=forms.Textarea)
    send_notification = forms.BooleanField(required=False)
    # <-- insert 4 spaces here
    fieldsets = ((u'Personal Information',
                {'fields': ('full_name', 'email', 'website'),
                'description': u'Your personal information will not ' \
                                u'be shared with 3rd parties.'}),
                (None,
                {'fields': ('message',),
                'description': u'All HTML will be stripped out.'}),
                (u'Preferences',
                {'fields': ('send_notification',)}))

inspect.getsource(forms) 工作方式不同的原因是因为inspect 在这种情况下不必确定类定义的开始和结束。它只是输出整个文件。

Answer 2

为我工作。我的代码中没有“from formfieldset.forms import FieldsetMixin”。也许这会导致问题..