code: def set_break(
              self, filename, lineno=None, temporary=False, cond=None,
              funcname=None
      ):
          
          log.info(
              'Setting break fn:%s lno:%s tmp:%s cond:%s fun:%s' %
              (filename, lineno, temporary, cond, funcname)
          )
          breakpoint = self.get_break(
              filename, lineno, temporary, cond, funcname
          )
          self.breakpoints.add(breakpoint)
          log.info('Breakpoint %r added' % breakpoint)
          return breakpoint
docs: Put a breakpoint for filename