/usr/share/pyshared/scrapy/item.py is in python-scrapy 0.14.4-1.
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 UserDict import DictMixin
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(type):
def __new__(mcs, class_name, bases, attrs):
fields = {}
new_attrs = {}
for n, v in attrs.iteritems():
if isinstance(v, Field):
fields[n] = v
else:
new_attrs[n] = v
cls = type.__new__(mcs, class_name, bases, new_attrs)
cls.fields = cls.fields.copy()
cls.fields.update(fields)
return cls
class DictItem(DictMixin, BaseItem):
fields = {}
def __init__(self, *args, **kwargs):
self._values = {}
if args or kwargs: # avoid creating dict for most common case
for k, v in dict(*args, **kwargs).iteritems():
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 keys(self):
return self._values.keys()
def __repr__(self):
return pformat(dict(self))
class Item(DictItem):
__metaclass__ = ItemMeta
|