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What is the difference between old style and new style classes in Python?
...a
new-style class instance is permitted to override the value returned
for x.__class__).
The major motivation for introducing new-style classes is to provide a unified object model with a full meta-model.
It also has a number of immediate benefits, like the ability to
subclass most ...
How do I check for C++11 support?
...etect at compile-time if the compiler supports certain features of C++11? For example, something like this:
8 Answers
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How can I filter a date of a DateTimeField in Django?
...te operator. Check "#9596 Comparing a DateTimeField to a date is too hard" for more details.
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How to write header row with csv.DictWriter?
...riter(fou, delimiter='\t', fieldnames=dr.fieldnames)
headers = {}
for n in dw.fieldnames:
headers[n] = n
dw.writerow(headers)
for row in dr:
dw.writerow(row)
As @FM mentions in a comment, you can condense header-writing to a one-liner, e.g.:
with open(outfile,'wb'...
What is the __DynamicallyInvokable attribute for?
...work types run faster. There's a comment about it in the Reference Source for System.Reflection.Assembly.cs, RuntimeAssembly.Flags property:
// Each blessed API will be annotated with a "__DynamicallyInvokableAttribute".
// This "__DynamicallyInvokableAttribute" is a type defined in its own asse...
How to print a query string with parameter values when using Hibernate
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You need to enable logging for the the following categories:
org.hibernate.SQL - set to debug to log all SQL DML statements as they are executed
org.hibernate.type - set to trace to log all JDBC parameters
So a log4j configuration could look li...
Is it intended by the C++ standards committee that in C++11 unordered_map destroys what it inserts?
...g in libstdc++, which is now fixed according to a comment on the question. For those curious, I took a look at the g++-4.8 headers.
bits/stl_map.h, lines 598-603
template<typename _Pair, typename = typename
std::enable_if<std::is_constructible<value_type,
...
Using AES encryption in C#
... rijAlg.IV = IV;
// Create a decryptor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt...
How to detect if a script is being sourced
... of the script or on the line after the shebang (which, if used, should be for ksh in order for it to work under the most circumstances).
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How to determine a Python variable's type?
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You may be looking for the type() built-in function.
See the examples below, but there's no "unsigned" type in Python just like Java.
Positive integer:
>>> v = 10
>>> type(v)
<type 'int'>
Large positive integer:
&g...