通用条目字段检查,适应于各种场景的使用。
Project description
gggifcheck
通用条目字段检查(General General General Item Field Check) ,是基于Python编写通用检查工具,适应于各种场景的使用,只需要略微进行适配。
使用方法
安装
pip install gggifcheck
使用CheckField
from gggifcheck.fields import StringCheckField
# 方式1
s = StringCheckField(key='s', value='aa', min_length=1, max_length=2,
contains=['a'], excludes=['b'])
print(s.value)
# 方式2
s = StringCheckField(min_length=1, max_length=2, contains=['a'], excludes=['b'])
s.input('s', 'aa')
print(s.value)
使用CheckItem
from gggifcheck import fields, items
class TestCheckItem(items.CheckItem):
a = fields.StringCheckField(min_length=1,
max_length=2, contains=['a'], excludes=['b'])
b = fields.StringCheckField(min_length=1,
max_length=2, contains=['a'], excludes=['c'])
item = TestCheckItem()
item['a'] = 'aa'
item['b'] = 'ab'
print(dict(item))
使用案例
结合scrapy
# 对scrapy Item进行改写
import scrapy
from gggifcheck import fields
from gggifcheck.items import CheckItem
class ScrapyCheckItem(scrapy.Item, CheckItem):
def __init__(self, *args, **kwargs):
self._values = {}
self._base_values = {}
if args or kwargs:
for k, v in dict(*args, **kwargs).items():
self[k] = v
def __getitem__(self, key):
if key in self.fields and key not in self._values:
value = None
for field1, field2 in self.relate_process_default:
value = self[field2]
break
self[key] = value
return self._values[key]
def __setitem__(self, key, value):
if key in self.fields:
self._base_values[key] = value
field = self.fields[key]
check_field = field.get('check_field')
if isinstance(check_field, fields.CheckField):
fe = check_field.from_instance()
fe.input(key, value)
self._values[key] = fe.value
else:
self._values[key] = value
else:
raise KeyError(
f"{self.__class__.__name__} does not support field: {key}")
def __setattr__(self, name, value):
if name.startswith('_'):
self.__dict__[name] = value
else:
raise AttributeError(
f"Use item[{name!r}] = {value!r} to set field value")
def check_all(self):
"""
进行所有字段检查
:return:
"""
self._process_and_check()
_ = [self[field] for field in self.fields]
def keys(self):
# 不能放在此处验证的原因是scrapy item进入pipeline前有日志打印等操作导致进行
# 此处验证,导致如果在pipeline里进行透传时验证不生效,提前检查报错,此处验证放
# 在check_all方法中,因此需要手动调用
# self._process_and_check()
# _ = [self[field] for field in self.fields] # 进行所有字段检查
return self._values.keys()
# 示例
class PostItem(ScrapyCheckItem):
id = scrapy.Field(
check_field=fields.MD5CheckField(nullable=False))
channel = scrapy.Field(
check_field=fields.IntegerCheckField(
nullable=False, min_value=1, max_value=6))
item = PostItem()
item['id'] = '81dc9bdb52d04dc20036dbd8313ed055'
item['channel'] = 1
print(dict(item))
关于作者
- 邮箱:1194542196@qq.com
- 微信:hu1194542196
- 目前还需要很多需要改进的地方,可以私信作者,你们的提供越多,本库才能更完善。
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