comefrom: <doocs>2125.Number of Laser Beams in a Bank_1.py
code: def numberOfBeams( bank: List[str]) -> int:
      last = ans = 0
      for b in bank:
          if (t := b.count('1')) > 0:
              ans += last * t
              last = t
      return ans
masked: def sample_funcname ( var_0 : List [ str ] ) -> int :
      var_6 = var_4 = 0
      for var_7 in var_0 :
          if ( var_8 := var_7.count ( '1' ) ) > 0 :
              var_4 += var_6 * var_8
              var_6 = var_8
      return var_4
  