$ twitter-to-sqlite user-timeline tweets.db --sql='select id from users' --ids
Traceback (most recent call last):
  File "/Users/simonw/.local/share/virtualenvs/twitter-to-sqlite-4ech4lJi/bin/twitter-to-sqlite", line 11, in <module>
    load_entry_point('twitter-to-sqlite', 'console_scripts', 'twitter-to-sqlite')()
  File "/Users/simonw/.local/share/virtualenvs/twitter-to-sqlite-4ech4lJi/lib/python3.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/Users/simonw/.local/share/virtualenvs/twitter-to-sqlite-4ech4lJi/lib/python3.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/Users/simonw/.local/share/virtualenvs/twitter-to-sqlite-4ech4lJi/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/simonw/.local/share/virtualenvs/twitter-to-sqlite-4ech4lJi/lib/python3.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/simonw/.local/share/virtualenvs/twitter-to-sqlite-4ech4lJi/lib/python3.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/Users/simonw/Dropbox/Development/twitter-to-sqlite/twitter_to_sqlite/cli.py", line 284, in user_timeline
    "@{:" + str(max(len(identifier) for identifier in identifiers)) + "}"
  File "/Users/simonw/Dropbox/Development/twitter-to-sqlite/twitter_to_sqlite/cli.py", line 284, in <genexpr>
    "@{:" + str(max(len(identifier) for identifier in identifiers)) + "}"
TypeError: object of type 'int' has no len()

$ twitter-to-sqlite user-timeline tweets.db --sql='select "" || id from users' --ids
... this worked ...