'How to disable emacs evil automatically add comment character

I'm using evil-mode in emacs, writing python code.
When I commented one line, then hit 'o' to start a new line, the comment character # was
automatically added to the new line. How to get rid of this feature?
I know in vim one can use :set formatoptions-=cro to do the trick, but in emacs there seems no such setting available.



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