how to extract values from <bound method Server.diagnostics of <Server: ubuntu12_6>>?

问题

I'm using novaclient.v1_1 to get list of instances and trying to extract diagnostics of each server instance.

code i've written

instances = nova.servers.list()
  for i in instances:
    val_list = i.diagnostics
    print val_list

so here i got output like this

<bound method Server.diagnostics of <Server: ubuntu12_6>>
<bound method Server.diagnostics of <Server: ubuntu12_4>>
<bound method Server.diagnostics of <Server: ubuntu12_3>>
<bound method Server.diagnostics of <Server: ubuntu12_1>>

so how can i get full diagnostics information of each server instance?? how to extract tap interface info from this object?

回答1:

As the output says, diagnostics is a method. That means you need to call it!

instances = nova.servers.list()
  for i in instances:
    val_list = i.diagnostics()     # <---- Add parenthesis here
    print val_list

来源：https://stackoverflow.com/questions/23441003/how-to-extract-values-from-bound-method-server-diagnostics-of-server-ubuntu12