I finded the flavor, and have returned, but why the function still raise Exception? and strange is I can not catch it .

I have a retrieveFlavor function.

    try:
        vcpus_id = data["vcpus"]
        vcpus = CPUType.objects.get(id=vcpus_id).name[:-1]
        flavor = retrieveFlavor(vcpu=str(vcpus),
                                ram=str(data["ram"]),
                                disk=str(data["disk_os"]["disk_size"]),
                                rxtx_factor=str(data["bandwidth"]))
    except Exception as e:
        raise Exception("创建Flavor失败，请联系运营商")

this is the retrieveFlavor function details:

In it, I find_flavor = super_conn.conn.compute.find_flavor(name_or_id=flavor_name)

and it have found the flavor, you can see in the red arrow, but when I step over it get out to the outter:

You can see it comes to the retrieveFlavor invoke place, and the exception is:

'NoneType' object has no attribute '_body'

The strange is

1) the compute.find_flavor() have get the flavor, why still raise Exception? 2) the compute.find_flavor() did not except the Exception, , direct raise to the outter(retrieveFlavor() invoke there).

How to do with that?