题解 | #HTTP状态码#

各位请帮忙看下为什么不通过

sum = 0
if a.isdigit() == True:
    if int(a)>=1 or  int(a)<= (10**9):
        for i in range(1,int(a)+1):
            sum+=i
        print(sum)
    else:
        print("erro")
else:
    print("erro")