This looks like some kind of import issue or something you’re doing is
interfering with the alembic.context module.
Another issue is that your stack trace seems to begin with running the
“alembic” command; the example in the documentation refers to API use of
Alembic, not using the command line script.
Here’s how that section is used. Create this script, “test.py":
# inside of a "create the database" script, first create
# tables:
from sqlalchemy import create_engine, MetaData, Table, Column, Integer
my_metadata = MetaData()
Table('t', my_metadata, Column('x', Integer))
engine = create_engine("sqlite:///mydb.db", echo=True)
my_metadata.create_all(engine)
# then, load the Alembic configuration and generate the
# version table, "stamping" it with the most recent rev:
from alembic.config import Config
from alembic import command
alembic_cfg = Config("./alembic.ini")
command.stamp(alembic_cfg, "head")
run it:
$ python test.py
2014-10-21 14:47:30,868 INFO sqlalchemy.engine.base.Engine SELECT
CAST('test plain returns' AS VARCHAR(60)) AS anon_1
2014-10-21 14:47:30,868 INFO sqlalchemy.engine.base.Engine ()
2014-10-21 14:47:30,868 INFO sqlalchemy.engine.base.Engine SELECT
CAST('test unicode returns' AS VARCHAR(60)) AS anon_1
2014-10-21 14:47:30,869 INFO sqlalchemy.engine.base.Engine ()
2014-10-21 14:47:30,869 INFO sqlalchemy.engine.base.Engine PRAGMA
table_info("t")
2014-10-21 14:47:30,869 INFO sqlalchemy.engine.base.Engine ()
2014-10-21 14:47:30,870 INFO sqlalchemy.engine.base.Engine
CREATE TABLE t (
x INTEGER
)
2014-10-21 14:47:30,870 INFO sqlalchemy.engine.base.Engine ()
2014-10-21 14:47:30,871 INFO sqlalchemy.engine.base.Engine COMMIT
INFO [alembic.migration] Context impl SQLiteImpl.
INFO [alembic.migration] Will assume non-transactional DDL.
that’s how the code in that section is invoked.
> On Oct 21, 2014, at 9:14 AM, Bryan Hanson <hans...@gmail.com> wrote:
>
> While following the tutorial section about building from scratch I get this
> error:
>
> Traceback (most recent call last):
> File "/home/ubuntu/workspace/Envs/ScrapyProj/bin/alembic", line 9, in
> <module>
> load_entry_point('alembic==0.6.7', 'console_scripts', 'alembic')()
> File
> "/home/ubuntu/workspace/Envs/ScrapyProj/local/lib/python2.7/site-packages/alembic/config.py",
> line 306, in main
> CommandLine(prog=prog).main(argv=argv)
> File
> "/home/ubuntu/workspace/Envs/ScrapyProj/local/lib/python2.7/site-packages/alembic/config.py",
> line 300, in main
> self.run_cmd(cfg, options)
> File
> "/home/ubuntu/workspace/Envs/ScrapyProj/local/lib/python2.7/site-packages/alembic/config.py",
> line 286, in run_cmd
> **dict((k, getattr(options, k)) for k in kwarg)
> File
> "/home/ubuntu/workspace/Envs/ScrapyProj/local/lib/python2.7/site-packages/alembic/command.py",
> line 129, in upgrade
> script.run_env()
> File
> "/home/ubuntu/workspace/Envs/ScrapyProj/local/lib/python2.7/site-packages/alembic/environment.py",
> line 105, in __exit__
> context._remove_proxy()
> File
> "/home/ubuntu/workspace/Envs/ScrapyProj/local/lib/python2.7/site-packages/alembic/util.py",
> line 84, in _remove_proxy
> del globals_[name]
> KeyError: 'config'
>
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