How to disable special naming convention inspection of PEP 8 in PyCharm?

Question

I installed PyCharm and enabled PEP8 checks in Inspections. If I write:

def func(argOne):
    print(argOne)

The IDE shows me this warning:

Argument name should be lowercase

There is no option to ignore only this inspection. I can't find such error number to ignore in PEP8. The naming inspections are here. How to ignore only some of them?

I need this because the current project coding guidelines must be kept. It's too hard to change the guidelines of the whole project.

I need to disable only some naming inspections. Not all like by "Settings"-> "Editor"-> "Inspections"->"PEP8 coding style violation". E.g. class names should be still inspected with PEP8 but function argument names should not.

Answer 1

Since PyCharm 2.7 you can hover over the inspected code and use the to Ignore errors like this.

Further more you can manage the ignored errors at Settings > Editor > Inspections > Python > PEP 8 naming convention violation > Ignored errors

Tested in PyCharm Community Edition 2016.3.2

Edit:

To remove the modification later on you can use to Show Only Modified Inspections and delete the Ignored errors with

Tested in PyCharm Community Edition 2017.2.3