python使用隐式循环快速求和的实现示例

class Debug:
  def calculateSum(self, size):
    return sum(range(size))


if __name__ == "__main__":
  main = Debug()
  result = main.calculateSum(101)
  print(result)          # 5050

class Debug:
  def calculateSum(self, size):
    _sum = 0
    for i in range(size):
      _sum += i
    return _sum


if __name__ == "__main__":
  main = Debug()
  result = main.calculateSum(101)
  print(result)          # 5050

print(range(101))  # range(0, 101)
print(list(range(101)))
"""
result :
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
"""

class Debug:
  def calculateSum(self, start, end, gap):
    return sum(range(start, end, gap))


if __name__ == "__main__":
  main = Debug()
  result = main.calculateSum(0, 101, 2)
  print(result)          # 2550