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Recommended way to get hostname in Java
Which of the following is the best and most portable way to get the hostname of the current computer in Java?
11 Answers
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How to check if a column exists in Pandas
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This will work:
if 'A' in df:
But for clarity, I'd probably write it as:
if 'A' in df.columns:
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NSString with \n or line break
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I just ran into the same issue when overloading -description for a subclass of NSObject. In this situation I was able to use carriage return (\r) instead of newline (\n) to create a line break.
[NSString stringWithFormat:@"%@\r%@", mystring1,mystring2];
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Resetting remote to a certain commit
...ch is called master both here and remotely, and that your remote is called origin you could do:
git reset --hard <commit-hash>
git push -f origin master
However, you should avoid doing this if anyone else is working with your remote repository and has pulled your changes. In that case, i...
Use-case of `oneway void` in Objective-C?
I found a strange keyword in NSObject.h
2 Answers
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What is the difference between a cer, pvk, and pfx file?
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Windows uses .cer extension for an X.509 certificate. These can be in "binary" (ASN.1 DER), or it can be encoded with Base-64 and have a header and footer applied (PEM); Windows will recognize either. To verify the integrity of a certificate, you have to...
How to cast an Object to an int
... you're sure that this object is an Integer :
int i = (Integer) object;
Or, starting from Java 7, you can equivalently write:
int i = (int) object;
Beware, it can throw a ClassCastException if your object isn't an Integer and a NullPointerException if your object is null.
This way you assume ...
Conditional Variable vs Semaphore
When should one use a semaphore and when should one use a conditional variable (CondVar) ?
6 Answers
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Floating point vs integer calculations on modern hardware
I am doing some performance critical work in C++, and we are currently using integer calculations for problems that are inherently floating point because "its faster". This causes a whole lot of annoying problems and adds a lot of annoying code.
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How to send a PUT/DELETE request in jQuery?
... Just a note, if you're using an IIS webserver and the jquery PUT or DELETE requests are returning 404 errors, you will need to enable these verbs in IIS. I've found this to be a good resource: geekswithblogs.net/michelotti/archive/2011/05/28/…
– TimDog
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