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Is it possible only to declare a variable without assigning any value in Python?
...es. If you init something to None, make sure that's what you really want, and assign something more meaningful if you can.
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How to hash some string with sha256 in Java?
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You'd basically convert the string into bytes (e.g. using text.getBytes(StandardCharsets.UTF_8)) and then hash the bytes. Note that the result of the hash would also be arbitrary binary data, and if you want to represent that in a string, you should use base64 or hex... don't try to use the String(...
$watch an object
...his therefore means that watching complex objects will have adverse memory and performance implications.
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How to convert a file into a dictionary?
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with is used here to handle the file clean up. When you leave the block (either just by normal execution flow or by an exception) there file will be automatically closed. You can read more about context-managers in Python here: effbot.org/zone/pyt...
Ruby 2.0.0p0 IRB warning: “DL is deprecated, please use Fiddle”
...alled my older versions of Ruby, removed all of my gems
(including Rails), and installed Ruby 2.0. In other words, a totally clean re-install. Upon starting IRB, I received this message:
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Android: How to put an Enum in a Bundle?
How do you add an Enum object to an Android Bundle?
12 Answers
12
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.Net HttpWebRequest.GetResponse() raises exception when http status code 400 (bad request) is return
... @MarkWatts: It should be whatever's been returned by the server, and has been in every situation I've seen. Can you reproduce this with a particular external URL? I suggest you ask a new question (referring to this one) and showing what's going on.
– Jon Skeet
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How do I create an average from a Ruby array?
...ore, it's not as magical as it might appear. It iterates over each element and then applies an accumulator value to it. The accumulator is then handed to the next element. In this case, our accumulator is simply an integer that reflects the sum of all the previous elements.
Edit: Commenter Dave Ray...
Hiding axis text in matplotlib plots
...is().set_ticks([])
In this second option, you can still use plt.xlabel() and plt.ylabel() to add labels to the axes.
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Initial size for the ArrayList
... immediately obvious from the api why you cannot set BOTH the initial size and the initial capacity in a single constructor call. You sort of have to read through the api and say "Oh, I guess ArrayList does not have a method or constructor to do that"
– demongolem
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