comefrom: <qiyuangong>724_Find_Pivot_Index_1.py
code: def pivotIndex( nums):
      totalsum = sum(nums)
      leftsum = 0
      for i, v in enumerate(nums):
          if leftsum == totalsum - leftsum - v:
              return i
          leftsum += v
      return -1
masked: def sample_funcname ( var_0 ) :
      var_2 = sum ( var_0 )
      var_4 = 0
      for var_6 , var_7 in enumerate ( var_0 ) :
          if var_4 == var_2 - var_4 - var_7 :
              return var_6
          var_4 += var_7
      return - 1
  