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Comparing boxed Long values 127 and 128
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Java caches Integer objects instances from the range -128 to 127. That said:
If you set to N Long variables the value 127 (cached), the same object instance will be pointed by all references. (N variables, 1 instance)
If you set to N Long variables the value 128 (not cached), you will have an ob...
Database cluster and load balancing
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Database clustering is a bit of an ambiguous term, some vendors consider a cluster having two or more servers share the same storage, some others call a cluster a set of replicated servers.
Replication defines the method by which a set of servers remain synchronized without having to share t...
Python group by
...ctionaries or external library such as pandas? If not, then how can I get rid of items and type in my result?
– Kourosh
Nov 26 '18 at 5:13
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difference and when to use getApplication(), getApplicationContext(), getBaseContext() and someClass
I'm new to android and I'm trying to understand the difference between getApplication() , getApplicationContext( ), getBaseContext() , getContext() and someClass.this and especially when to use the these methods in the following code lines:
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How to form tuple column from two columns in Pandas
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Did this work on your data? If so, can you share your pandas version and the data? I wonder why your code did not work, it should.
– Wouter Overmeire
Apr 16 '13 at 12:25
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nil detection in Go
...aring a structure instance and nil. They're not of the same type so it considers it as an invalid comparison and yells at you.
What you want to do here is to compare a pointer to your config instance to nil, which is a valid comparison. To do that you can either use the golang new builtin, or initi...
How can I do DNS lookups in Python, including referring to /etc/hosts?
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How to write header row with csv.DictWriter?
... / 3.2 there is a new writeheader() method. Also, John Machin's answer provides a simpler method of writing the header row.
Simple example of using the writeheader() method now available in 2.7 / 3.2:
from collections import OrderedDict
ordered_fieldnames = OrderedDict([('field1',None),('field2',No...
Closing WebSocket correctly (HTML5, Javascript)
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consider these problems with onbeforeunload event
– artkoenig
Jan 16 '15 at 21:06
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How to edit a node module installed via npm?
I'm using the node_swiz module, which in turn uses the validator module.
5 Answers
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