How to use for loop to sum in python

You can use a for loop to implement cumulative summation in Python

for loop syntax:

 for 变量 in range(x):
      循环需要执行的代码

The following implements the summation from 1 to n:

def main():
  sum = 0    # 定义变量做累加器
  n = int(input('n='))   #从键盘上输入累加的范围
  for x in range(n):   
    sum += (x + 1)
  print(sum)
 
if __name__ == '__main__':
  main()

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