使用Python Fabric Library获取env.hosts列表的当前值

Question

I've got this code ( foo and bar are local servers):

env.hosts = ['foo', 'bar']

def mytask():
    print(env.hosts[0])

Which, of course prints foo every iteration.

As you probably know, Fabric iterates through the env.hosts list and executes mytask() on each of them this way:

fab mytask

does

task is executed on foo
task is executed on bar

I'm looking for a way to get the current host in every iteration.

Thanks,

Answer 1

Use env.host_string . You can find a full list of env variables here .

Answer 2

You can just do:

env.hosts = ['foo', 'bar']

def mytask():
     print(env.host)

Because when you're in the task as executed by fab, you'll have that var set for free.

Answer 3

Thanks Marcelo.

If you want to actually use env.host_string (for concatenation purpose for instance), be sure to be inside a task. Its value is None outside.