#源代码
import urllib.request
urllib.request.urlopen('https://www.baidu.com').read()
#运行后报错信息
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1317, in do_open
encode_chunked=req.has_header('Transfer-encoding'))
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1244, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1290, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1239, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1026, in _send_output
self.send(msg)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 966, in send
self.connect()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 1414, in connect
server_hostname=server_hostname)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 423, in wrap_socket
session=session
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 870, in _create
self.do_handshake()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 1139, in do_handshake
self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1076)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "", line 1, in
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 222, in urlopen
return opener.open(url, data, timeout)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 525, in open
response = self._open(req, data)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 543, in _open
'_open', req)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 503, in _call_chain
result = func(*args)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1360, in https_open
context=self._context, check_hostname=self._check_hostname)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1319, in do_open
raise URLError(err)
urllib.error.URLError:
解决方案：
#方法1（忽略Https校验）
from urllib.request import urlopen
import ssl
#生成证书上下文(unverified 就是不验证https证书)
context = ssl._create_unverified_context()
ret = urlopen(url,context=context)
#打印页面内容
print(ret.read().decode('utf-8'))
#方法2（重写Https默认的校验方式）
from urllib.request import urlopen
import ssl
ssl._create_default_https_context = ssl._create_unverified_context
ret = urlopen('https://www.jd.com').read()
print(ret.decode('utf-8'))
在平时工作中，难免会遇到把 XML 作为数据存储格式。面对目前种类繁多的解决方案，哪个最适合我们呢？在这篇文章中，我对这四种主流方案做一个不完全评测，仅仅针对遍历 XML 这块来测试，因为遍历 XML 是工作中使用最多的（至少我认为）。 预 备 测试环境： AMD 毒龙1.4G OC 1.5G、256M DDR333、Windows2000 Server
Netty 3.x的user guide里FrameDecoder的例子，有几个疑问：
1.文档说：FrameDecoder calls decode method with an internally maintained cumulative buffer whenever new data is received.
为什么每次有新数据到达时，都会调用decode方法？
2.Dec
hive> select * from t_test where ds=20150323 limit 2;
OK
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
问题原因： hive堆内存默认为256M
这个问题的解决方法为：
修改/us
Simply do the following:
I. Declare a global variable:
var markersArray = [];
II. Define a function:
function clearOverlays() {
for (var i = 0; i < markersArray.length; i++ )
Quick sort is probably used more widely than any other. It is popular because it is not difficult to implement, works well for a variety of different kinds of input data, and is substantially faster t
