How do I do to have more then 1 constraint?

[DBruV]

Hi,
How do I have to write the code so I can have two or more constraints? I've tried like this, but it gives me an error.

stats = bt.optimize(
    Fema_len = range(2,100,1),
    Sema_len = range(20,200,1),
    Lema_len = range(200,500,10),
    maximize= optim_func,
    constraint= lambda param: param.Fema_len < param.Sema_len, 
    constraint= lambda param: param.Sema_len < param.Lema_len, 
)

[kernc]

Bactest.optimize(constraint=) function can be arbitrarily complex:

stats = bt.optimize(
    ...,
    constraint=lambda param: (param.Fema_len < param.Sema_len and 
                              param.Sema_len < param.Lema_len)
)