python报"TypeError: object of type 'Greenlet' has no len()"

TypeError: object of type 'Greenlet' has no len()

Code in question:

gevent.joinall (

gevent.spawn (func1),

gevent.spawn (func2),

gevent.spawn (FUNC3),

)

It should be:

gevent.joinall ([

gevent.spawn (func1),

gevent.spawn (func2),

gevent.spawn (FUNC3),

])

Summary: gevent.joinall ( ) parameter should be a list [gevent.spawn (func1), gevent.spawn (func2), gevent.spawn (func3), ]