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  3. sqlalchemy.ext.declarative.as_declarative()

Python sqlalchemy.ext.declarative 模块，as_declarative() 实例源码

我们从Python开源项目中，提取了以下27个代码示例，用于说明如何使用sqlalchemy.ext.declarative.as_declarative()。

项目：Flask_Blog    作者：sugarguo    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：QXSConsolas    作者：qxsch    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：flasky    作者：RoseOu    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：oa_qian    作者：sunqb    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：chihu    作者：yelongyu    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：ShelbySearch    作者：Agentscreech    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：pyetje    作者：rorlika    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Price-Comparator    作者：Thejas-1    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Flask-NvRay-Blog    作者：rui7157    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Flask-NvRay-Blog    作者：rui7157    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Callandtext    作者：iaora    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：python_ddd_flask    作者：igorvinnicius    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：webapp    作者：superchilli    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：QualquerMerdaAPI    作者：tiagovizoto    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：gardenbot    作者：GoestaO    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：flask-zhenai-mongo-echarts    作者：Fretice    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Data-visualization    作者：insta-code1    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：micro-blog    作者：nickChenyx    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：python-flask-security    作者：weinbergdavid    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：watcher    作者：nosmokingbandit    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Lixiang_zhaoxin    作者：hejaxian    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：flask    作者：bobohope    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Chorus    作者：DonaldBough    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Hawkeye    作者：tozhengxq    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：Alfred    作者：jkachhadia    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：ngx_status    作者：YoYoAdorkable    | 项目源码 | 文件源码 
def as_declarative(**kw):
    """
    Class decorator for :func:`.declarative_base`.

    Provides a syntactical shortcut to the ``cls`` argument
    sent to :func:`.declarative_base`, allowing the base class
    to be converted in-place to a "declarative" base::

        from sqlalchemy.ext.declarative import as_declarative

        @as_declarative()
        class Base(object):
            @declared_attr
            def __tablename__(cls):
                return cls.__name__.lower()
            id = Column(Integer, primary_key=True)

        class MyMappedClass(Base):
            # ...

    All keyword arguments passed to :func:`.as_declarative` are passed
    along to :func:`.declarative_base`.

    .. versionadded:: 0.8.3

    .. seealso::

        :func:`.declarative_base`

    """
    def decorate(cls):
        kw['cls'] = cls
        kw['name'] = cls.__name__
        return declarative_base(**kw)

    return decorate
项目：ormeasy    作者：spoqa    | 项目源码 | 文件源码 
def repr_entity(entity: object) -> str:
    """Make a representation string for the given ``entity`` object.
    If the class specified ``__repr_columns__`` it prints
    these attributes instead of its primary keys.


    .. code-block::

       from sqlalchemy.ext.declarative import as_declarative
       from ormeasy.sqlalchemy import repr_entity

       @as_declarative()
       class Base:

          def __repr__(self):
              return repr_entity(self)


       class Song(Base):

          __tablename__ = 'song'

          __repr_columns__ = 'name', 'genre'

          id = Column(Integer, primary_key=True)

          name = Column(Unicode)

          genre = Column(Unicode)


       print(repr(Song(name='hello', genre='brit-pop'))) # it prints `<Song name=hello, genre=brit-pop>`

    .. seealso::

       ``as_declarative``
          http://docs.sqlalchemy.org/en/latest/orm/extensions/declarative/api.html#sqlalchemy.ext.declarative.as_declarative

    :param entity: an object to make a representation string
    :return: a representation string
    :rtype: :class:`str`

    """  # noqa
    cls = type(entity)
    mod = cls.__module__
    name = ('' if mod == '__main__ ' else mod + '.') + cls.__qualname__
    try:
        columns = entity.__repr_columns__
    except AttributeError:
        columns = cls.__mapper__.primary_key
    names = (column if isinstance(column, str) else column.name
             for column in columns)
    pairs = ((name, getattr(entity, name))
             for name in names
             if hasattr(entity, name))
    args = ' '.join(k + '=' + repr(v) for k, v in pairs)
    return '<{0} {1}>'.format(name, args)