Python sqlalchemy.types 模块，FLOAT 实例源码

def __init__(self, precision=None, scale=None, asdecimal=False, **kw):
        """Construct a FLOAT.

        :param precision: Total digits in this number.  If scale and precision
          are both None, values are stored to limits allowed by the server.

        :param scale: The number of digits after the decimal point.

        """

        super(FLOAT, self).__init__(precision=precision, scale=scale,
                                    asdecimal=asdecimal, **kw)

def visit_FLOAT(self, type_):
        if type_.scale is not None and type_.precision is not None:
            return "FLOAT(%s, %s)" % (type_.precision, type_.scale)
        else:
            return "FLOAT"

def __init__(self, precision=None, scale=None, asdecimal=False, **kw):
        """Construct a FLOAT.

        :param precision: Total digits in this number.  If scale and precision
          are both None, values are stored to limits allowed by the server.

        :param scale: The number of digits after the decimal point.

        """

        super(FLOAT, self).__init__(precision=precision, scale=scale,
                                    asdecimal=asdecimal, **kw)

def visit_FLOAT(self, type_):
        if type_.scale is not None and type_.precision is not None:
            return "FLOAT(%s, %s)" % (type_.precision, type_.scale)
        else:
            return "FLOAT"

def __init__(self, precision=None, scale=None, asdecimal=False, **kw):
        """Construct a FLOAT.

        :param precision: Total digits in this number.  If scale and precision
          are both None, values are stored to limits allowed by the server.

        :param scale: The number of digits after the decimal point.

        """

        super(FLOAT, self).__init__(precision=precision, scale=scale,
                                    asdecimal=asdecimal, **kw)

def visit_FLOAT(self, type_):
        if type_.scale is not None and type_.precision is not None:
            return "FLOAT(%s, %s)" % (type_.precision, type_.scale)
        else:
            return "FLOAT"

def sqltype_to_stdtype(sqltype):
    import sqlalchemy.types as sqltypes
    if isinstance(sqltype, (sqltypes.VARCHAR, sqltypes.CHAR, sqltypes.TEXT, sqltypes.Enum, sqltypes.String)):
        return _STRING_TYPE
    if isinstance(sqltype, (sqltypes.DATETIME, sqltypes.DATE, sqltypes.TIME, sqltypes.TIMESTAMP)):
        return _DATE_TYPE
    if isinstance(sqltype, (sqltypes.INTEGER, sqltypes.BIGINT, sqltypes.SMALLINT, sqltypes.Integer)):
        return _INTEGER_TYPE
    if isinstance(sqltype, (sqltypes.REAL, sqltypes.DECIMAL, sqltypes.NUMERIC, sqltypes.FLOAT)):
        return _DECIMAL_TYPE
    if isinstance(sqltype, sqltypes.BOOLEAN):
        return _BOOLEAN_TYPE