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Why are Python lambdas useful? [closed]
...name, there is nothing obscure, intimidating or cryptic about it. When you read the following line, replace lambda by function in your mind:
>>> f = lambda x: x + 1
>>> f(3)
4
It just defines a function of x. Some other languages, like R, say it explicitly:
> f = function(x)...
Setting up FTP on Amazon Cloud Server [closed]
... myself and wanted to expand on Jaminto's answer.
I'm assuming that you already have an EC2 instance created and have associated an Elastic IP Address to it.
Step #1: Install vsftpd
SSH to your EC2 server. Type:
> sudo yum install vsftpd
This should install vsftpd.
Step #2: Open up the ...
Merge PDF files
...ions.
#!/usr/bin/env python
import sys
try:
from PyPDF2 import PdfFileReader, PdfFileWriter
except ImportError:
from pyPdf import PdfFileReader, PdfFileWriter
def pdf_cat(input_files, output_stream):
input_streams = []
try:
# First open all the files, then produce the outpu...
What is the correct way of using C++11's range-based for?
... copy ctor.
3 X copy ctor.
5 X copy ctor.
7 X copy ctor.
9
As it can be read from the output, copy constructor calls are made during range-based for loop iterations.
This is because we are capturing the elements from the container by value
(the auto x part in for (auto x : v)).
This is ineffici...
NoSql vs Relational database
...
Documents can be stored in non-relational databases, like CouchDB.
Maybe reading this will help.
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What is InnoDB and MyISAM in MySQL?
...ation to coarser granularity locks) and Oracle-style consistent nonlocking reads increase multi-user concurrency and performance. InnoDB stores user data in clustered indexes to reduce I/O for common queries based on primary keys. To maintain data integrity, InnoDB also supports FOREIGN KEY referent...
How to fetch all Git branches
... oneliner BEFORE git pull --all:
git branch -r | grep -v '\->' | while read remote; do git branch --track "${remote#origin/}" "$remote"; done
TL;DR version
git branch -r | grep -v '\->' | while read remote; do git branch --track "${remote#origin/}" "$remote"; done
git fetch --all
git pull ...
How to change the session timeout in PHP?
...d for EXACTLY 1 hour
session_set_cookie_params(3600);
session_start(); // ready to go!
This works by configuring the server to keep session data around for at least one hour of inactivity and instructing your clients that they should "forget" their session id after the same time span. Both of thes...
html onchange event not working
...t doesn't work. I still need to press the submit button to make it work. I read about AJAX and I am thinking to learn about this. Do I still need AJAX to make it work or is simple JavaScript enough? Please help.
...
How to split csv whose columns may contain ,
...leIO.TextFieldParser class. This will handle parsing a delimited file, TextReader or Stream where some fields are enclosed in quotes and some are not.
For example:
using Microsoft.VisualBasic.FileIO;
string csv = "2,1016,7/31/2008 14:22,Geoff Dalgas,6/5/2011 22:21,http://stackoverflow.com,\"Corv...