[Python] In Flask-migrate ValueError: invalid interpolation syntax in connection string at...

I am using flask migrate to for database creation & migration in flask with flask-sqlalchemy.

Everything was working fine until I changed my database user password contains '@' then it stopped working so, I updated my code based on Writing a connection string when password contains special characters

It working for application but not for flask-migration, Its showing error while migrating

i.e on python manage.py db migrate

ValueError: invalid interpolation syntax in u'mysql://user%40ssword@localhost/testdb' at position 15


Here password is p@ssword and its escaped by urlquote (see above question link).

Full error stack:

Traceback (most recent call last):
File "manage.py", line 20, in <module>
manager.run()
File "/usr/local/lib/python2.7/dist-packages/flask_script/__init__.py", line 412, in run
result = self.handle(sys.argv[0], sys.argv[1:])
File "/usr/local/lib/python2.7/dist-packages/flask_script/__init__.py", line 383, in handle
res = handle(*args, **config)
File "/usr/local/lib/python2.7/dist-packages/flask_script/commands.py", line 216, in __call__
return self.run(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/flask_migrate/__init__.py", line 177, in migrate
version_path=version_path, rev_id=rev_id)
File "/usr/local/lib/python2.7/dist-packages/alembic/command.py", line 117, in revision
script_directory.run_env()
File "/usr/local/lib/python2.7/dist-packages/alembic/script/base.py", line 407, in run_env
util.load_python_file(self.dir, 'env.py')
File "/usr/local/lib/python2.7/dist-packages/alembic/util/pyfiles.py", line 93, in load_python_file
module = load_module_py(module_id, path)
File "/usr/local/lib/python2.7/dist-packages/alembic/util/compat.py", line 79, in load_module_py
mod = imp.load_source(module_id, path, fp)
File "migrations/env.py", line 22, in <module>
current_app.config.get('SQLALCHEMY_DATABASE_URI'))
File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 218, in set_main_option
self.set_section_option(self.config_ini_section, name, value)
File "/usr/local/lib/python2.7/dist-packages/alembic/config.py", line 245, in set_section_option
self.file_config.set(section, name, value)
File "/usr/lib/python2.7/ConfigParser.py", line 752, in set
"position %d" % (value, tmp_value.find('%')))
ValueError: invalid interpolation syntax in u'mysql://user%40ssword@localhost/testdb' at position 15


Please help

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