Série 1+2+3+4...=(m*(m+1))/2 em python

(m*(m+1))÷2.py

print("k1 = 1")
print("k1+ k2 +...+ m = (m*(m+1))/2")
k = 1
m=int(input("m = "))
tmp = k
print("k = ",k)
print("sum = ", tmp)
while k < m:
  k+=1
  tmp+=k
  print("k = ",k)
  print("sum = ", tmp)
print("(m*(m+1))/2 = ",(m*(m+1))/2)