Will test the change tomorrow.

FYI I believe the error was:

TypeError: Converting py args to operator properties: : keyword "proportional" unrecognized

So the only significant change in this patch is simply on line 132, from:

proportional='DISABLED'

to

use_proportional_edit=False

(not sure that the properties listed after that are even necessary.)
The rest is just single-line formatting for readability.

Perhaps related to:
rB40b66ac2a654809f518b3df91c5af2111013cb4d
rBe83d4d963766487919edb8858de0020ef2c3cfe8