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Comparing boxed Long values 127 and 128
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TL;DR
Java caches boxed Integer instances from -128 to 127. Since you are using == to compare objects references instead of values, only cached objects will match. Either work with long unboxed primitive values or use .equals() to compare your Long objects.
Long (pu...
How to find the mime type of a file in python?
...ike this.
# For MIME types
import magic
mime = magic.Magic(mime=True)
mime.from_file("testdata/test.pdf") # 'application/pdf'
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What is the real overhead of try/catch in C#?
... a good way of controlling process flow, but where does this overhead come from and what is it's actual impact?
12 Answers
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What's the difference between JPA and Hibernate? [closed]
...r ORM. Also, I understand that Hibernate has more features than JPA 2. But from a practical point of view, what really is the difference?
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iPhone - Grand Central Dispatch main thread
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Dispatching a block to the main queue is usually done from a background queue to signal that some background processing has finished e.g.
- (void)doCalculation
{
//you can use any string instead "com.mycompany.myqueue"
dispatch_queue_t backgroundQueue = dispatch_queue_c...
Signed to unsigned conversion in C - is it always safe?
...he unsigned value (UINT_MAX +1). Similarly what is the easy way to convert from unsigned to signed? Do we need to subtract the given number from max value (256 in case of unsigned char)? For example: 140 when converted to signed number becomes -116. But 20 becomes 20 itself. So any easy trick here?
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Why does Lua have no “continue” statement?
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Coming from a python background this is a confusing answer because every scope there already knows what are its local variables before running. I.e. I expected an unbound local variable error in the case of reaching until....
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How can I set NODE_ENV=production on Windows?
... they persist beyond just the single command prompt, you can find the tool from System in Control Panel (or by typing 'environment' into the search box in the start menu).
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How to clone all remote branches in Git?
...ou will see
Branch experimental set up to track remote branch experimental from origin.
Switched to a new branch 'experimental'
That last line throws some people: "New branch" - huh?
What it really means is that the branch is taken from the index and created locally for you. The previous line is a...
Getting individual colors from a color map in matplotlib
... do
rgba = cmap(0.5,bytes=True)
So to simplify the code based on answer from Ffisegydd, the code would be like this:
#import colormap
from matplotlib import cm
#normalize item number values to colormap
norm = matplotlib.colors.Normalize(vmin=0, vmax=1000)
#colormap possible values = viridis, j...