SublimeText encloses lines in white rectangles

Looks like you have SublimeLinter installed. It highlights errors and warnings.

If you still have a problem with those solutions suggested above (with anaconda lint):

Disable linting altogether within the user-defined Anaconda settings file, Anaconda.sublime-settings, via the file menu: Sublime > Preferences > Package Settings > Anaconda > Settings – User: When it opens file, just type the following and save it away ;-)

{"anaconda_linting": false}

At least, it fixed my problem. Blessings (a debtor)<><

You probably can change "anaconda_linter_mark_style" to "none" and keep "anaconda_linter_underlines" as true. This way it'll only put a underscore under errors but not highlight the whole line.

Disabling Annaconda linting in sublimetext 3 for current file:

1. Enter command palette by Cntrl + Shift + P or Command + shift + P for Mac OS X
2. Type Anaconda: Disable linting on this file and hit enter
3. To re-enable linting Anaconda: Enable linting on this file

Disabling linting persists between sessions.

Source