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How to use filter, map, and reduce in Python 3
...ou can read about the changes in What's New In Python 3.0. You should read it thoroughly when you move from 2.x to 3.x since a lot has been changed.
The whole answer here are quotes from the documentation.
Views And Iterators Instead Of Lists
Some well-known APIs no longer return lists:
[...]
map(...
Fatal error: “No Target Architecture” in Visual Studio
When I try to compile my c++ project using Visual Studio 2010 in either Win32 or x64 mode I get the following error:
11 Ans...
How do I convert between big-endian and little-endian values in C++?
How do I convert between big-endian and little-endian values in C++?
31 Answers
31
...
How can I implement a tree in Python?
...an/Jan'), Node('/Udo/Dan/Joe'))
Features
anytree has also a powerful API with:
simple tree creation
simple tree modification
pre-order tree iteration
post-order tree iteration
resolve relative and absolute node paths
walking from one node to an other.
tree rendering (see example above)
node attach...
Why does ReSharper tell me “implicitly captured closure”?
...s) => this.label1.Text = (g.Next() + i).ToString();
}
I get an "Implicitly captured closure: g" warning at the first lambda. It is telling me that g cannot be garbage collected as long as the first lambda is in use.
The compiler generates a class for both lambda expressions and puts all variab...
Calling constructors in c++ without new
...ng a constructor of the format Thing(const char*).
The second one is a bit more complex. It essentially does the following
Create an object of type Thing using the constructor Thing(const char*)
Create an object of type Thing using the constructor Thing(const Thing&)
Call ~Thing() on the o...
How to find out which package version is loaded in R?
I am in a process of figuring out how to use my university cluster. It has 2 versions of R installed. System wide R 2.11 (Debian 6.0) and R 2.14.2 in non-standard location.
...
Stop Mongoose from creating _id property for sub-document array items
...
It's simple, you can define this in the subschema :
var mongoose = require("mongoose");
var subSchema = mongoose.Schema({
//your subschema content
},{ _id : false });
var schema = mongoose.Schema({
// schema conten...
Why does Ruby 1.9.2 remove “.” from LOAD_PATH, and what's the alternative?
...
It was deemed a "security" risk.
You can get around it by using absolute paths
File.expand_path(__FILE__) et al
or doing
require './filename' (ironically).
or by using
require_relative 'filename'
or adding an "inc...
Get model's fields in Django
Given a Django model, I'm trying to list all of its fields. I've seen some examples of doing this using the _meta model attribute, but doesn't the underscore in front of meta indicate that the _meta attribute is a private attribute and shouldn't be accessed directly? ... Because, for example, the ...