(python)字符串中找出連續最長的數字串

代碼：

def long_num(str):
    max_list = []
    
    for i in range(len(str)):
        new_list = []
        for j in range(i+1,len(str)):
            if str[j].isdigit():
                new_list.append(str[j])
            else:
                break
            if len(max_list) < len(new_list):
                max_list = new_list
    return "".join(max_list)

測試：

s = "124241htjrjr797rgrrw1575373573733"
print(long_num(s))

結果：

1575373573733