Single character parameters need to have double quote to avoid yaml keyword conflicts

[Tomcli]

I think this is a bug, we should have double quote on single character parameter for n and y to avoid this issue. For now I will lgtm and open another issue for it

Originally posted by @Tomcli in #660 (comment)

[Tomcli]

to reproduce this issue, use either n or y as the parameter name or key and the issue will be reproduced. We need to put double quotes on them to avoid these conflicts

[pugangxa]

/assign
Strange it works for me with double quotes on. Anyway I will make it clear.

[pugangxa]

I found when I run the file conditions_and_loops.py(change n1 back to n) directly then the yaml would be fine. But in test with GENERATE_GOLDEN_YAML being true then it would be error.
Seems it's due to yaml dump/load, see yaml/pyyaml#247