my_num = int(input("Enter a number... "))
for j in range(1,my_num+1):
    my_list=[]
    for i in range(1,j+1):
        print(i,sep=" ",end=" ")
        if(i<j):
            print("+",sep=" ",end=" ")
        my_list.append(i)
    print("=",sum(my_list))

print()

输入一个数字... 5
1 = 1
1 + 2 = 3
1 + 2 + 3 = 6
1 + 2 + 3 + 4 = 10
1 + 2 + 3 + 4 + 5 = 15