Python 求两数间素数和为何会输出等于号？

def num(n):    for i in range(2,n):        if n %i == 0:            return 0        break    else:        return na = int(input())b = int(input())s = 0for n in range(a,b+1):    s += num(n)    if n == 1:        print("he%d"%s-1)    else:        print("he%d"%s)

def num(n):    return [n if n%i!=0 else (n-n) for i in range(2,n)]a = int(input())b = int(input())s = 0for n in range(a,b+1):    for t in num(n):        s += t    if n == 1:        print("he%d"%(s-1))    else:        print("he%d"%s)