python对列表中的字符串加和

def numsum(s):
    sum = 0  # 定义变量，准备记录数字的和
    for i in range(len(s)):  # 遍历字符串
        try:
            sum = sum + float(s[i])  # 将字符转成int，求和
        except:
            continue
    return sum

num(s=[1, 2, 3])