wsgiref錯誤解決筆記 "write() argument must be a bytes instance"

　　錯誤提示：

C:\Users\Dmail\AppData\Local\Programs\Python\Python37\python.exe "E:/s9/day60/06 jinja2版web服務端示例.py"
我再8090等你哦...
Traceback (most recent call last):
  File "C:\Users\Dmail\AppData\Local\Programs\Python\Python37\lib\wsgiref\handlers.py", line 138, in run
    self.finish_response()
  File "C:\Users\Dmail\AppData\Local\Programs\Python\Python37\lib\wsgiref\handlers.py", line 184, in finish_response
    self.write(data)
  File "C:\Users\Dmail\AppData\Local\Programs\Python\Python37\lib\wsgiref\handlers.py", line 279, in write
    "write() argument must be a bytes instance"
AssertionError: write() argument must be a bytes instance
127.0.0.1 - - [29/Sep/2019 13:13:30] "GET /index/ HTTP/1.1" 500 59
127.0.0.1 - - [29/Sep/2019 13:13:30] "GET /favicon.ico HTTP/1.1" 200 14

　　錯誤代碼：

from wsgiref.simple_server import make_server
from jinja2 import Template

def index():
    with open('06jinja2版web框架.html','r',encoding='utf-8')as f:
        data = f.read()
    template = Template(data) # 生成模板文件
    ret = template.render({"name":"Dmail","hobby_list":['編程','大寶劍']}) #把數據填充到模板里面
    return [ret.encode('utf-8'),]



url_func = [
    ('/index/',index)]

def run_server(environ,star_response):
    star_response('200 OK',[('Content-Type','text/html;charset=urf-8')])
    url = environ['PATH_INFO'] #取到用戶輸入的url
    #print(url)
    func = None
    for i in url_func:
        if i[0] == url:
            func = i[1]
            break
    if func:
        response = func()
    else:
        response = b'404 not found!'
    return response

if __name__ == '__main__':
    httpd = make_server('127.0.0.1',8090,run_server)
    print('我再8090等你哦...')
    httpd.serve_forever()

　　

run_server函數執行到
response = func():
...
return [ret.encode('utf-8'),]
得到的返回值是一個列表
發現返回值給錯了，應該是給一個bytes
將最后給返回值的代碼改成
return ret.encode('utf-8')
訪問:127.0.0.1:8090/index/之后可以正常訪問了，但還是會報錯
再將
run_server函數里的return改一下
return [response,]
好了，可以正常訪問了，而且沒有報錯。
修改后的代碼：

from wsgiref.simple_server import make_server
from jinja2 import Template

def index():
    with open('06jinja2版web框架.html','r',encoding='utf-8')as f:
        data = f.read()
    template = Template(data) # 生成模板文件
    ret = template.render({"name":"Dmail","hobby_list":['編程','大寶劍']}) #把數據填充到模板里面
    return ret.encode('utf-8')


url_func = [
    ('/index/',index)]

def run_server(environ,star_response):
    star_response('200 OK',[('Content-Type','text/html;charset=urf-8')])
    url = environ['PATH_INFO'] #取到用戶輸入的url
    #print(url)
    func = None
    for i in url_func:
        if i[0] == url:
            func = i[1]
            break
    if func:
        response = func()
    else:
        response = b'404 not found!'
    return [response,]

if __name__ == '__main__':
    httpd = make_server('127.0.0.1',8090,run_server)
    print('我再8090等你哦...')
    httpd.serve_forever()

　　服務端日志：

C:\Users\Dmail\AppData\Local\Programs\Python\Python37\python.exe "E:/s9/day60/06 jinja2版web服務端示例.py"
我再8090等你哦...
127.0.0.1 - - [29/Sep/2019 13:27:37] "GET /index/ HTTP/1.1" 200 213
127.0.0.1 - - [29/Sep/2019 13:27:37] "GET /favicon.ico HTTP/1.1" 200 14
127.0.0.1 - - [29/Sep/2019 13:27:40] "GET /index/ HTTP/1.1" 200 213
127.0.0.1 - - [29/Sep/2019 13:27:40] "GET /favicon.ico HTTP/1.1" 200 14

　　PS：報錯啥原因我也一臉懵逼，不太清楚，反正搜索谷歌，百度啊，修修改改就改好了。emmm，記個博客吧，怕以后遇到類似的錯誤。