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What is aspect-oriented programming?
... understand object oriented programming, and have been writing OO programs for a long time. People seem to talk about aspect-oriented programming, but I've never really learned what it is or how to use it. What is the basic paradigm?
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How does strtok() split the string into tokens in C?
...l to extract these tokens is that you hand strtok your main string and the set of delimiters. Then you call it repeatedly, and each time strtok will return the next token it finds. Till it reaches the end of the main string, when it returns a null. Another rule is that you pass the string in only th...
How to create a temporary directory and get the path / file name in Python
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Add Keypair to existing EC2 instance
...ly want to fix your files, here is the approach that has worked for many:
Setup
Identify the original instance (A) and volume that contains the broken root EBS volume with the files you want to view and edit.
instance_a=i-XXXXXXXX
volume=$(ec2-describe-instances $instance_a |
egrep '^BLOCKDEVI...
jQuery UI DatePicker - Change Date Format
...ed.
$( ".selector" ).datepicker({ dateFormat: 'yy-mm-dd' });
Get or set the dateFormat option, after init.
//getter
var dateFormat = $( ".selector" ).datepicker( "option", "dateFormat" );
//setter
$( ".selector" ).datepicker( "option", "dateFormat", 'yy-mm-dd' );
...
csv.Error: iterator should return strings, not bytes
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Create web service proxy in Visual Studio from a WSDL file
..., Fire up an instance of that class, and it'll have a URL property you can set on the fly, and a bunch of methods that you can call. It'll also generate classes for all/any complex objects passed across the service interface.
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How do you reference a capture group with regex find and replace in Visual Studio 2012, 2013, 2015,
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Pandas percentage of total with groupby
...u can calculate the percentage in a simpler way -- just groupby the state_office and divide the sales column by its sum. Copying the beginning of Paul H's answer:
# From Paul H
import numpy as np
import pandas as pd
np.random.seed(0)
df = pd.DataFrame({'state': ['CA', 'WA', 'CO', 'AZ'] * 3,
...
Convert a String In C++ To Upper Case
...
This problem is vectorizable with SIMD for the ASCII character set.
Speedup comparisons:
Preliminary testing with x86-64 gcc 5.2 -O3 -march=native on a Core2Duo (Merom). The same string of 120 characters (mixed lowercase and non-lowercase ASCII), converted in a loop 40M times (wit...