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Commit 9719aa1

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author
yangwenqiang.ywq
committed
this and weakref
Change-Id: I3b4ce57023fa50abdcf0e83262a0e77424f30b75
1 parent 76be0bf commit 9719aa1

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‎README.md

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@@ -19,6 +19,8 @@ python的强大之处有很大的一方面在于它有各种各样非常强大
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> Python无所不能
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## [this](content/this.md)
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## [MySQLdb](content/MySQLdb.md)
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## [os](content/os.md)
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## [pyrasite](content/pyrasite.md)
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## [weakref](content/weakref.md)
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## [tools](content/tools.md)
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## [Other_thing](content/other_thing.md)

‎code/marshmallow_demo.py

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# coding=utf-8
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from datetime import datetime
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from marshmallow import Schema, fields, pprint
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class ArtistSchema(Schema):
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name = fields.Str()
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location = fields.List(fields.Str())
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class AlbumSchema(Schema):
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title = fields.Str()
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release_date = fields.Date()
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artist = fields.Nested(ArtistSchema())
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bowie = dict(name='David Bowie', location=["Beijing", "Shanghai"])
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album = dict(artist=bowie, title="Hunky Dory", release_date=datetime.now())
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schema = AlbumSchema()
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result = schema.dump(album)
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pprint(result, indent=2)
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‎code/marshmallow_load.py

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# coding=utf-8
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from pprint import pprint
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from marshmallow import Schema, fields, pprint, post_load
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class User(object):
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"""docstring for User"""
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def __init__(self, created_at, email, name):
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self.created_at = created_at
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self.email = email
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self.name = name
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class UserSchema(Schema):
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created_at = fields.Date()
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email = fields.Str()
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name = fields.Str()
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age = fields.Int()
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# @post_load
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# def make_user(self, data):
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# return User(**data)
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user_data = {
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'created_at': '2014年08月11日T05:26:03.869245',
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# 'email': u'ken@yahoo.com',
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'name': u'Ken',
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'age': '20-'
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}
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schema = UserSchema()
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result = schema.load(user_data)
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pprint(result.data)
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print(type(result.data))
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print(result)
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print(type(result))
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# {'name': 'Ken',
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# 'email': 'ken@yahoo.com',
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# 'created_at': datetime.datetime(2014, 8, 11, 5, 26, 3, 869245)},
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print result.data['name']
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result.data['name'] = 'windard'
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print result
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print result.data.name
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result.data['email'] = result.data.get('email', None)
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print type(result.data['age'])
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‎content/logging.md

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所以可以使用 `logger.exception` 代替 `logger.error` ,日志等级也是 `error`, 但是会打印出异常的堆栈信息。
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logging 如果不配置是没有数据输出的,但是如果不想写这么长的配置怎么办呢?直接使用 `logging.basicConfig()` 进行一个简单的基础配置。
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示例代码
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‎content/this.md

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## this
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```
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>>> import this
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The Zen of Python, by Tim Peters
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Beautiful is better than ugly.
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Explicit is better than implicit.
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Simple is better than complex.
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Complex is better than complicated.
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Flat is better than nested.
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Sparse is better than dense.
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Readability counts.
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Special cases aren't special enough to break the rules.
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Although practicality beats purity.
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Errors should never pass silently.
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Unless explicitly silenced.
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In the face of ambiguity, refuse the temptation to guess.
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There should be one-- and preferably only one --obvious way to do it.
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Although that way may not be obvious at first unless you're Dutch.
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Now is better than never.
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Although never is often better than *right* now.
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If the implementation is hard to explain, it's a bad idea.
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If the implementation is easy to explain, it may be a good idea.
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Namespaces are one honking great idea -- let's do more of those!
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```
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‎content/weakref.md

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## weakref
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正常的引用会将引用计数器加一,最后在引用计数为零的时候删除,回收内存。
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使用弱引用类型不会将计数器加一,可以减少避免循环引用,长期占有内存的情况。
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可以使用 `sys.getrefcount` 来查看一个对象的引用次数。

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