python 报错：a bytes-like object is required, not 'str'

核心代码：

def ipPools(numPage):
    headers = randomHeads()
    url = 'http://www.xicidaili.com/nn/'
    saveFsvFile = open('ips.csv', 'wb')
    writer = csv.writer(saveFsvFile)
    for num in range(1, numPage + 1):
        full_url = url + str(num)
        re = requests.get(full_url, headers=headers)
        soup = BeautifulSoup(re.text, 'lxml')
        res = soup.find(id="ip_list").find_all('tr')
        for item in res:
            try:
                temp = []
                tds = item.find_all('td')
                proxyIp = tds[1].text.encode("utf-8")
                proxyPort = tds[2].text.encode("utf-8")
                temp.append(proxyIp)
                temp.append(proxyPort)
                writer.writerow(temp)
                print('保存为excel成功！')
            except IndexError:
                pass
注意点：
   一定要将str转为bytes :
   str.encode("utf-8")
   python36 file方法改为open
   open('ips.csv', 'wb')将wb改为w  我出错就在这。  如果有相同错误可以，作为参考吧！

推荐链接：
　　https://stackoverflow.com/questions/43582925/python-a-bytes-like-object-is-required-not-str-while-printing
　　https://blog.csdn.net/csu_vc/article/details/78372932

这两个可以看下。