大约有 30,000 项符合查询结果（耗时：0.0286秒） [XML]
can we use xpath with BeautifulSoup?
... from urllib.request import urlopen
from lxml import etree
url = "http://www.example.com/servlet/av/ResultTemplate=AVResult.html"
response = urlopen(url)
htmlparser = etree.HTMLParser()
tree = etree.parse(response, htmlparser)
tree.xpath(xpathselector)
There is also a dedicated lxml.html() modul...
Parsing HTML using Python
...b2
from BeautifulSoup import BeautifulSoup
page = urllib2.urlopen('http://www.google.com/')
soup = BeautifulSoup(page)
x = soup.body.find('div', attrs={'class' : 'container'}).text
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Memory management in Qt?
...ter. The following article describes various smart pointers in Qt.
https://www.qt.io/blog/2009/08/25/count-with-me-how-many-smart-pointer-classes-does-qt-have
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...
difference between socket programming and Http programming
...t an endpoint. it could follow http protocol to come in a communication in www as a client requesting a page or it could act as a server listening to connections. or maybe it could follow another set of rules or protocols like ssh, ftp and communicate in other ways.
now in socket programming you cou...
How do I use the new computeIfAbsent function?
...ohn");
Stuart Marks & Brian Goetz did a good talk about this
https://www.youtube.com/watch?v=9uTVXxJjuco
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Heroku “psql: FATAL: remaining connection slots are reserved for non-replication superuser connectio
...ow you to pool connections at the database level using PGBouncer.
https://www.lewagon.com/blog/how-to-migrate-heroku-postgres-database-to-amazon-rds
UPDATE:
Heroku responded to my open ticket and stated that my database was improperly load balanced in their network. They said that improvements t...
What does value & 0xff do in Java?
...
From http://www.coderanch.com/t/236675/java-programmer-SCJP/certification/xff
The hex literal 0xFF is an equal int(255). Java represents int as 32 bits. It look like this in binary:
00000000 00000000 00000000 11111111
When you do a b...
Most common way of writing a HTML table with vertical headers?
...y your headings will also be interpreted right on screen readers.
https://www.w3.org/WAI/tutorials/tables/one-header/#table-with-header-cells-in-the-first-column-only
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What do the python file extensions, .pyc .pyd .pyo stand for?
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Also for some further discussion on .pyc vs .pyo, take a look at: http://www.network-theory.co.uk/docs/pytut/CompiledPythonfiles.html (I've copied the important part below)
When the Python interpreter is invoked with the -O flag, optimized code is generated and stored in ‘.pyo’ files. T...
How to use WinForms progress bar?
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Hey there's a useful tutorial on Dot Net pearls: http://www.dotnetperls.com/progressbar
In agreement with Peter, you need to use some amount of threading or the program will just hang, somewhat defeating the purpose.
Example that uses ProgressBar and BackgroundWorker: C#
using ...