How to do query with `WHERE value IN list` in the Python Peewee ORM?

The docs has the answer: x << y will perform x IN y, where y is a list or query. So the final query will look like:

MyModel.select().where(MyModel.sell_currency << ['BTC', 'LTC'])

You can also do "IN" expressions with a subquery. For example, to get users whose username starts with "a":

a_users = User.select().where(fn.Lower(fn.Substr(User.username, 1, 1)) == 'a')

The .in_() method signifies an "IN" query

a_user_tweets = Tweet.select().where(Tweet.user.in_(a_users))

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