gistfile1.txt

$ python decl_enum.py 
/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/sql/default_comparator.py:153: SAWarning: The IN-predicate on "employee.type" was invoked with an empty sequence. This results in a contradiction, which nonetheless can be expensive to evaluate.  Consider alternative strategies for improved performance.
  'strategies for improved performance.' % expr)
2015-12-14 04:09:53,442 INFO sqlalchemy.engine.base.Engine SELECT CAST('test plain returns' AS VARCHAR(60)) AS anon_1
2015-12-14 04:09:53,442 INFO sqlalchemy.engine.base.Engine ()
2015-12-14 04:09:53,443 INFO sqlalchemy.engine.base.Engine SELECT CAST('test unicode returns' AS VARCHAR(60)) AS anon_1
2015-12-14 04:09:53,444 INFO sqlalchemy.engine.base.Engine ()
2015-12-14 04:09:53,445 INFO sqlalchemy.engine.base.Engine PRAGMA table_info("employee")
2015-12-14 04:09:53,446 INFO sqlalchemy.engine.base.Engine ()
2015-12-14 04:09:53,447 INFO sqlalchemy.engine.base.Engine 
CREATE TABLE employee (
	id INTEGER NOT NULL, 
	name VARCHAR(60) NOT NULL, 
	type VARCHAR, 
	PRIMARY KEY (id), 
	CONSTRAINT ck_employee_type CHECK (type != type)
)


2015-12-14 04:09:53,451 INFO sqlalchemy.engine.base.Engine ()
2015-12-14 04:09:53,452 INFO sqlalchemy.engine.base.Engine COMMIT
2015-12-14 04:09:53,453 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)
2015-12-14 04:09:53,455 INFO sqlalchemy.engine.base.Engine ROLLBACK
Traceback (most recent call last):
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1073, in _execute_context
    context = constructor(dialect, self, conn, *args)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 582, in _init_compiled
    param.append(processors[key](compiled_params[key]))
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/sql/type_api.py", line 962, in process
    return process_param(value, dialect)
  File "decl_enum.py", line 86, in process_bind_param
    return value.value
AttributeError: 'tuple' object has no attribute 'value'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "decl_enum.py", line 127, in <module>
    sess.commit()
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 801, in commit
    self.transaction.commit()
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 392, in commit
    self._prepare_impl()
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 372, in _prepare_impl
    self.session.flush()
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 2015, in flush
    self._flush(objects)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 2133, in _flush
    transaction.rollback(_capture_exception=True)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 182, in reraise
    raise value
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 2097, in _flush
    flush_context.execute()
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/unitofwork.py", line 373, in execute
    rec.execute(self)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/unitofwork.py", line 532, in execute
    uow
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/persistence.py", line 174, in save_obj
    mapper, table, insert)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/orm/persistence.py", line 785, in _emit_insert_statements
    execute(statement, params)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 914, in execute
    return meth(self, multiparams, params)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/sql/elements.py", line 323, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1010, in _execute_clauseelement
    compiled_sql, distilled_params
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1078, in _execute_context
    None, None)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1341, in _handle_dbapi_exception
    exc_info
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 188, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=exc_value)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 181, in reraise
    raise value.with_traceback(tb)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1073, in _execute_context
    context = constructor(dialect, self, conn, *args)
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 582, in _init_compiled
    param.append(processors[key](compiled_params[key]))
  File "/home/vagrant/venv/lib/python3.4/site-packages/sqlalchemy/sql/type_api.py", line 962, in process
    return process_param(value, dialect)
  File "decl_enum.py", line 86, in process_bind_param
    return value.value
sqlalchemy.exc.StatementError: (builtins.AttributeError) 'tuple' object has no attribute 'value' [SQL: 'INSERT INTO employee (name, type) VALUES (?, ?)'] [parameters: [{'name': 'e1', 'type': ('F', 'Full Time')}]]


$ python --version
Python 3.4.3

$ pip show sqlalchemy
---
Name: SQLAlchemy
Version: 1.0.9
Location: /home/vagrant/venv/lib/python3.4/site-packages
Requires: 

$ uname -a
Linux vagrant-ubuntu-trusty-64 3.13.0-68-generic #111-Ubuntu SMP Fri Nov 6 18:17:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux