/usr/lib/python3/dist-packages/scrapy/item.py is in python3-scrapy 1.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Scrapy Item
See documentation in docs/topics/item.rst
"""
from pprint import pformat
from collections import MutableMapping
from abc import ABCMeta
import six
from scrapy.utils.trackref import object_ref
class BaseItem(object_ref):
"""Base class for all scraped items."""
pass
class Field(dict):
"""Container of field metadata"""
class ItemMeta(ABCMeta):
def __new__(mcs, class_name, bases, attrs):
classcell = attrs.pop('__classcell__', None)
new_bases = tuple(base._class for base in bases if hasattr(base, '_class'))
_class = super(ItemMeta, mcs).__new__(mcs, 'x_' + class_name, new_bases, attrs)
fields = getattr(_class, 'fields', {})
new_attrs = {}
for n in dir(_class):
v = getattr(_class, n)
if isinstance(v, Field):
fields[n] = v
elif n in attrs:
new_attrs[n] = attrs[n]
new_attrs['fields'] = fields
new_attrs['_class'] = _class
if classcell is not None:
new_attrs['__classcell__'] = classcell
return super(ItemMeta, mcs).__new__(mcs, class_name, bases, new_attrs)
class DictItem(MutableMapping, BaseItem):
fields = {}
def __init__(self, *args, **kwargs):
self._values = {}
if args or kwargs: # avoid creating dict for most common case
for k, v in six.iteritems(dict(*args, **kwargs)):
self[k] = v
def __getitem__(self, key):
return self._values[key]
def __setitem__(self, key, value):
if key in self.fields:
self._values[key] = value
else:
raise KeyError("%s does not support field: %s" %
(self.__class__.__name__, key))
def __delitem__(self, key):
del self._values[key]
def __getattr__(self, name):
if name in self.fields:
raise AttributeError("Use item[%r] to get field value" % name)
raise AttributeError(name)
def __setattr__(self, name, value):
if not name.startswith('_'):
raise AttributeError("Use item[%r] = %r to set field value" %
(name, value))
super(DictItem, self).__setattr__(name, value)
def __len__(self):
return len(self._values)
def __iter__(self):
return iter(self._values)
__hash__ = BaseItem.__hash__
def keys(self):
return self._values.keys()
def __repr__(self):
return pformat(dict(self))
def copy(self):
return self.__class__(self)
@six.add_metaclass(ItemMeta)
class Item(DictItem):
pass
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