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报错： _tkinter.TclError: cannot use geometry manager pack inside . which already has slaves managed by grid 原因： 一个程序中，只能使用一种布局，否则会报上面的错误。
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报错： _tkinter.TclError: cannot use geometry manager pack inside . which already has slaves managed by grid 原因： 一个程序中，只能使用一种布局，否则会报上面的错误。
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据这里解释为文件名字和pymysql module名字重复了。麻蛋，原来还这么弱智。
Error
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='pymysql')
AttributeError: 'module' object has no attribute 'connect'
code
import pymysql
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='pymysql')
cur = conn.cursor()
cur.execute("SELECT Host,User FROM user")
print(cur.description)
print()
for row in cur:
print(row)
cur.close()
conn.close()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1318, in do_open
encode_chunked=req.has_header('Transfer-encoding'))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1239, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1285, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1234, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1026, in _send_output
self.send(msg)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 964, in send
self.connect()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1400, in connect
server_hostname=server_hostname)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 407, in wrap_socket
_context=self, _session=session)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 814, in __init__
self.do_handshake()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 1068, in do_handshake
self._sslobj.do_handshake()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 689, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)
python2.7升级到python3需要对ssl进行校验
所以需要引入模块ssl
import ssl
在urlopen中
context添加ssl._create_unverified_context()
关闭ssl校验即可
url = "https://www.baidu.com"context = ssl._create_unverified_context()get = urllib.request.urlopen(url, context = context ).read() print(get)
但是这种办法不推荐，因为最好不要关闭验证
> from urllib import request >>> url = 'https://www.baidu.com' >>> with request.urlopen(url) as f: ... data = f.read() ... print(f.status)
以上办法可能会无效
取消全局验证
import ssl ssl._create_default_https_context = ssl._create_unverified_context
然后使用urllib.urlopen(‘url’)
3.6\twisted\words\im
copying src\twisted\words\xish\xpathparser.g -> build\lib.win-amd64-3.6\twis
ted\words\xish
running build_ext
building ‘twisted.test.raiser’ extension
error: Microsoft Visual C++ 14.0 is required. Get it with “Microsoft Visual
C++ Build Tools”: http://landinghub.visualstudio.com/visual-cpp-build-tools
按照提示网址打开一直提示400，算了，还是自己官网找下https://www.microsoft.com/zh-CN/download/details.aspx?id=48145
1、安装Python开发环境
a、打开官网网址：https://www.python.org/，选择适合计算机系统版本。
b、建议选择Python3.x以上版本，安装。
2、从电脑的开始找到Python，并打开
3、输入print（“Hello，word！”），回车。第一个Python运行成功。
1、简单，确实很简单，没有太别严格的语法，就像说话一样。小学老师说的一句话叫“你写的作文就像流水账！”，对头，Python就是如此。
2、门槛低，入门很快的，不管你是否又编程基础，或是你非IT行业工作者，只要你不是文盲，想提高自己的做事效率，或者转行，Python很适合你。
3、八面玲珑，它涵盖近六个行业的编程应用，如算法，建模，网络安全，web后台，应用软件，数据处理，图像处理……
4、积木达人，具有丰富的功能库，包括官方，第三方，应有尽有，只要你能想到的，基本上都有。拿过来就用。