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Why is “if not someobj:” better than “if someobj == None:” in Python?
... the object has a __nonzero__ special method (as do numeric built-ins, int and float), it calls this method. It must either return a bool value which is then directly used, or an int value that is considered False if equal to zero.
Otherwise, if the object has a __len__ special method (as do contain...
How to read XML using XPath in Java
...Then you call expr.evaluate() passing in the document defined in that code and the return type you are expecting, and cast the result to the object type of the result.
If you need help with a specific XPath expressions, you should probably ask it as separate questions (unless that was your question...
Where does Git store the SHA1 of the commit for a submodule?
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Yep. I see where it is now. And it matches the id from git submodule status. Thanks.
– Abizern
Feb 17 '11 at 20:21
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What is the 
 character?
...s the equivalent to \n -> LF (Line Feed).
Sometimes it is used in HTML and JavaScript. Otherwise in .NET environments, use Environment.NewLine.
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HTTP status code 0 - Error Domain=NSURLErrorDomain?
... your http error calll back, angulartutorial.net/2017/03/http-status-codes-and-meanings.html
– Prashobh
Mar 15 '17 at 10:48
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How to create .pfx file from certificate and private key?
...le is just a text file with your private key in it.
If you have a root CA and intermediate certs, then include them as well using multiple -in params
openssl pkcs12 -export -out domain.name.pfx -inkey domain.name.key -in domain.name.crt -in intermediate.crt -in rootca.crt
You can install openssl ...
Can you nest html forms?
...th tabs, each tab is its own form (so you can submit it to save progress), and they're all wrapped in a form, which you can submit to save everything. Makes sense to me.
– Rob Grant
Dec 24 '13 at 6:45
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How to prevent going back to the previous activity?
..., if you have HomeActivity -> IntermediateActivity -> FinalActivity, and you call finish() in the IntermediateActivity immediately after starting the FinalActivity you'll see the HomeActivity for a brief moment.
– David Murdoch
Dec 17 '15 at 18:08
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Detecting 'stealth' web-crawlers
... examined web server logs for excessive activity from any given IP address and issued firewall rules to block offenders. It included whitelists of IP addresses/ranges based on http://www.iplists.com/, which were then updated automatically as needed by checking claimed user-agent strings and, if the...
how to detect search engine bots with php?
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Erm, strpos returns FALSE on failure, too. It's faster and more efficient, though (no preprocessing, and no O(m) storage).
– Damon
Apr 14 '14 at 10:19
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