fixed startup of QoS SAI tests

[antonptashnik]

Description of PR

Summary: fixed startup of QoS SAI tests
Fixes # (issue)
QoS SAI tests fail with the error on ptfhost_utils.py:185 :

TypeError: <lambda>() takes exactly 2 arguments (1 given)

Fixed it

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 201911
• 202012

Approach

What is the motivation for this PR?

Fix QoS SAI tests

How did you do it?

Fixed syntax issue in map func usage

How did you verify/test it?

py.test --inventory=../ansible/lab,../ansible/veos --testbed_file=../ansible/testbed.csv --module-path=../ansible/library -v -rA --topology=t1,any qos/test_qos_sai.py

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[ZhaohuiS]

LGTM

[antonptashnik]

@wangxin take a look please

[ZhaohuiS]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[ZhaohuiS]

@OleksandrKozodoi Does this fix work for both python2 and python3?
I think this is compatibility issue introduced by #4867. For now, sonic-mgmt asks all the changes need to be both python2&3 compatible.
BTW, lambda has different behavior for py2 and py3, is it better to fix it in a common way such as using for loop to replace lambda? Then it could no more compatibility issue for this case. Thanks.
And map doesn't return list in python3, you have to turn it into list.
So, I suggest rewriting the code, don't use lambda and map. What do you think about it?

[antonptashnik]

@ZhaohuiS I agree. I'm closing this PR in favor of #5845

[OleksandrKozodoi]

Hi @ZhaohuiS. You are right, this is compatibility issue introduced by #4867. I agree, that it is better to fix it by using a loop. Thanks for your suggestion!

[ZhaohuiS]

Hi @ZhaohuiS. You are right, this is compatibility issue introduced by #4867. I agree, that it is better to fix it by using a loop. Thanks for your suggestion!

@OleksandrKozodoi Thanks.