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What does “hashable” mean in Python?
...y and a set member, because these data structures use the hash value internally.
All of Python’s immutable built-in objects are hashable, while no mutable containers (such as lists or dictionaries) are. Objects which are instances of user-defined classes are hashable by default; they all comp...
Immutability of Strings in Java
...t, and changing a reference. s2 still points to the same object as we initially set s1 to point to. Setting s1 to "Help!" only changes the reference, while the String object it originally referred to remains unchanged.
If strings were mutable, we could do something like this:
String s1 = "Hello";
St...
“The remote certificate is invalid according to the validation procedure.” using Gmail SMTP server
...onfirmation that the error is being throw because of a bad certificate.
Call this method before you call smtpclient.Send():
[Obsolete("Do not use this in Production code!!!",true)]
static void NEVER_EAT_POISON_Disable_CertificateValidation()
{
// Disabling certificate validati...
NPM modules won't install globally without sudo
I have just reinstalled Ubuntu 12.04 LTS, and before anything else i did these steps :
14 Answers
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Difference between JSONObject and JSONArray
...en dealing with JSON that begins with curly braces. A JSON object is typically used to contain key/value pairs related to one item.
For example: {"name": "item1", "description":"a JSON object"}
Of course, JSON arrays and objects may be nested inside one another. One common example of this is an A...
Python argparse: How to insert newline in the help text?
...nfortunately Only the name of this class is considered a public API. All the methods provided by the class are considered an implementation detail. So probably not a great idea, although it might not matter, since 2.7 is meant to be the last 2.x python and you'll be expected to refactor lots ...
Where is my Django installation?
...
Current top (accepted) answer works with my Ubuntu installation. As does yours. As do all of them!
– Adam Marshall
Apr 28 '14 at 14:24
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“Private” (implementation) class in Python
I am coding a small Python module composed of two parts:
7 Answers
7
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Storing images in SQL Server?
I have made a small demo site and on it I am storing images within a image column on the sql server. A few questions I have are...
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Throwing exceptions from constructors
...ody who creates the object of mutex has to remember that init() has to be called. I feel it goes against the RAII principle.
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