Can I get PyCharm to suppress a particular warning on a single line?
To suppress PyCharm code inspections for a particular line of code you can use the following construct:
# noinspection INSPECTION_NAMEyour_line_of_code_to_suppresswhere the name of the inspection (INSPECTION_NAME above) you can take from the list of inspection names (they are pretty descriptive).
To suppress pylint command line messages explicitly you have to use different comments/commands, as described here (pylint error names).
Essentially, for the file in which you want to suppress the warning, run it through code inspection, post which PyCharm will give you warnings in that particular file. You can then review the warnings and tell PyCharm to suppress warning for a particular statement.
Code Inspection can be accessed from Code-->Inspect Code menu from where you can select the file that you want to inspect.
Below is an image that shows how to do it for an image, after running code via CodeInspection
Link for more details around suppressing warnings: https://www.jetbrains.com/help/pycharm/2016.1/suppressing-inspections.html#1