not_
ReQL command: ~, not_
Command syntax
bool.not_() → bool not_(bool) → bool (~bool) → bool
Description
Compute the logical inverse (not) of an expression.
not_
can be called either via method chaining, immediately after an expression that evaluates as a boolean value, or by passing the expression as a parameter to not_
. All values that are not False
or None
will be converted to True
.
You may also use ~
as a shorthand operator.
Example: Not true is false.
r.not_(True).run(conn) r.expr(True).not_().run(conn) (~r.expr(True)).run(conn)
These evaluate to false
.
Note that when using ~
the expression is wrapped in parentheses. Without this, Python will evaluate r.expr(True)
first rather than using the ReQL operator and return an incorrect value. (~True
evaluates to −2 in Python.)
Example: Return all the users that do not have a “flag” field.
r.table('users').filter( lambda users: (~users.has_fields('flag')) ).run(conn)
Example: As above, but prefix-style.
r.table('users').filter( lambda users: r.not_(users.has_fields('flag')) ).run(conn)
Related commands
Get more help
Couldn't find what you were looking for?
- Ask a question on Stack Overflow
- Chat with us and our community on Slack
- Talk to the team on IRC on #rethinkdb@freenode.net — via Webchat
- Ping @rethinkdb on Twitter
- Post an issue on the documentation issue tracker on GitHub
© RethinkDB contributors
Licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License.
https://rethinkdb.com/api/python/not/