Python – Lists and Dict(ionarie)s

One of the fist things you’ll most likely encounter with Python are the datatypes lists and dicts.  While they initially seem quite simple, things can get awfully complex, awfully fast when you start intermingling the two datatypes.  So we’ll start with the basics, then dive into some more complex examples. 

Lists
Lists are defined as ‘a collection of different pieces of information as a sequence under a single variable name’.  So that’s a fancy way of saying it’s just a list.  In Python, lists are defined by using the ‘[]’ brackets.  So for example…

# A list with one item
list = ["Jon"]

# A list with multiple items
list = ["Jon", "Matt", "Bill"]

# An empty list
list = []

Items in lists can be accessed by index.  For example…

# A list with multiple items
list = ["Jon", "Matt", "Bill"]

print "The second name in the list is " + list[1]

# Result
The second name in the list is Matt

We can also iterate through the list with a simple loop…

# A list with multiple items
list = ["Jon", "Matt", "Bill"]

for name in list:
    print name

# Result
 Continue reading

Network Automation: Be Bold!

I’ve had something on my mind concerning network automation, and I think it’s worth mentioning it here.

There’s been a lot of talk - including plenty from myself - about using tools like Ansible for creating network configuration files; that is, text files that contain configurations for network devices, usually a list of CLI commands. And this is a great first step, certainly if you’re new to network automation.

It’s really not that hard to generate configurations. You can do it in about five lines of Python, or you can stick with that Excel spreadsheet powered by macros (you know who you are). I challenge anyone to tell me that Ansible is better at generating config templates than Excel. The reality is that it’s not - and it’s hardly attempting to be.

So, for the sake of making a point, let’s say the generation mechanism doesn’t matter. Let’s concede that this is the wrong optimization to be making. The question becomes - what is the right optimization?

I think the bigger problem to address is that of treating our networks like fragile snowflakes. I can’t tell you how many times I’ve logged into a device, and felt like I was Continue reading

Network Automation: Be Bold!

I’ve had something on my mind concerning network automation, and I think it’s worth mentioning it here.

There’s been a lot of talk - including plenty from myself - about using tools like Ansible for creating network configuration files; that is, text files that contain configurations for network devices, usually a list of CLI commands. And this is a great first step, certainly if you’re new to network automation.

It’s really not that hard to generate configurations. You can do it in about five lines of Python, or you can stick with that Excel spreadsheet powered by macros (you know who you are). I challenge anyone to tell me that Ansible is better at generating config templates than Excel. The reality is that it’s not - and it’s hardly attempting to be.

So, for the sake of making a point, let’s say the generation mechanism doesn’t matter. Let’s concede that this is the wrong optimization to be making. The question becomes - what is the right optimization?

I think the bigger problem to address is that of treating our networks like fragile snowflakes. I can’t tell you how many times I’ve logged into a device, and felt like I was Continue reading

Network Automation: Be Bold!

Network Automation: Be Bold!

Last Chance! Simplify WAN/MAN Orchestration through SDN Segment Routing

Join SDxCentral and Cisco for a special DemoFriday on October 30th at 10:00am PT on how SDN with Segment Routing can simplify WAN/MAN orchestration.

Teaching AND Training Are Education

Training isn't enough. You need some teaching too.

The post Teaching AND Training Are Education appeared first on EtherealMind.

NASA spots briny water flows on Mars

NASA said today that liquid water flows intermittently on Mars– a significant finding in the decades-long search for life and for possible human use on future trips to the red planet.The water flow evidence was spotted by researchers from Georgia Tech employing NASA’s Mars Reconnaissance Orbiter (MRO) – a 4,800lb spacecraft that has been taking pictures and measurements of Mars since 2006. In this case, using an imaging spectrometer researchers detected signatures of hydrated minerals on slopes where mysterious dark streaks are seen on the red planet in dozens of locations.+More on Network World: NASA touts real technologies highlighted in imminent 'The Martian' flick+To read this article in full or to leave a comment, please click here

‘Found this today in a building…’

A Redditor submitted this picture to the section of that site that is devoted to networking. “I think this is more of a network cabling thing,” he writes. “I mean the installation isn’t that old to find something like this but ... personally speechless to find this in a modern building.” Here’s the full picture: Reddit user riahc3 via Imgur What is it?To read this article in full or to leave a comment, please click here

Network Break 55: Microsoft’s Switch, Security Gets Hotter

Network Break 55 examines new switch releases from Microsoft, Arista & Dell, a white-hot security market, Cisco security bugs, and why we don't need to get worked up about cloud outages any more.

The post Network Break 55: Microsoft’s Switch, Security Gets Hotter appeared first on Packet Pushers.

How to ace the CISO interview – be ready for the tough questions

Getting a top job in information security has never been as simple as just having the required training and experience. Yes, those are mandatory, but the modern hiring process also includes personality evaluations to determine the so-called “XQ” – whether a candidate would be a good “fit” for a position – background checks and yes, the personal interview.It is generally the final stop before either a job offer, or a perfunctory “thanks-for-your-interest” dismissal.And as the roles of the CISO and CSO have evolved in recent years from a relatively narrow focus as “guardians of the data” to members of the C suite who are expected to speak the language of business, participate in strategic planning and be perceived as business enablers rather than impediments, the interview has evolved as well.To read this article in full or to leave a comment, please click here(Insider Story)

Cloudera unveils in-memory store, security layer for Hadoop

Just ahead of the opening of Strata + Hadoop World in New York City tomorrow, Cloudera today unveiled a new open source project to enable real-time analytic applications in Hadoop and an open source security layer for unified access control enforcement in Hadoop.The first project, Kudu, is an in-memory store for Hadoop that supports high-performance sequential and random reads and writes, enabling fast analytics on changing data.To read this article in full or to leave a comment, please click here

NSA chief warns cyberthreats persist despite China accord

On the eve of a significant agreement between the United States and China on trade and information security, the head of the National Security Agency cautioned that the two superpowers must develop a set of norms that would curb cyber-espionage and theft of intellectual property from U.S. firms.Adm. Michael Rogers appeared in a rare open hearing of the Senate intelligence committee to offer an update on the agency's work, with a particular focus on the various cyberthreats, which increasingly are coming from state-sponsored actors.[ Related: What would a U.S.-China cybertreaty really mean? ]To read this article in full or to leave a comment, please click here

Using Vagrant with OpenStack

In my earlier post on using Docker Machine with OpenStack, I talked about combining technologies in a “provider/consumer” model. In this post, I’m going to talk about creating this provider/consumer model using a different combination of technologies: OpenStack as the infrastructure provider and Vagrant for consuming that infrastructure.

If you’re unfamiliar with Vagrant, I recommend you first read this introduction to Vagrant (after that you can dig into all the other Vagrant-tagged posts). As I explain in that first post, Vagrant leverages the idea of providers (which enable Vagrant to work with various back-end virtualization platforms/solutions) as well as boxes (which are essentially VM templates). In this particular case, we’re leveraging an OpenStack provider for Vagrant that allows Vagrant to use OpenStack as the back-end virtualization solution. However, since OpenStack already has the equivalent of VM templates (in the form of images), there’s no need to use a Vagrant box. This makes using Vagrant with OpenStack slightly different than your typical Vagrant use case.

Prerequisites

Let’s start with reviewing some prerequisites—these are the things you’ll need to do/have done before you can use Vagrant with OpenStack (besides the obvious things like having Vagrant installed).

1. You’ll need a working OpenStack Continue reading

After pushing malware, ad networks also used for DDoS

Rogue online advertisements that infect computers with malware have become a common occurrence on the Internet. But now, it appears, hackers have also figured out how to launch crippling distributed denial-of-service (DDoS) attacks through ad networks.The DDoS mitigation team at CloudFlare recently observed a large-scale attack which they believe was the result of malicious ads being loaded inside apps and browsers on mobile devices.The attack, which targeted one of the company's customers, peaked at 275,000 HTTP requests per second and was launched from over 650,000 unique IP (Internet Protocol) addresses, most of them from China.What was interesting about this attack was that the requests appeared to be generated by real browsers, not scripts or malware, as are typically used in HTTP-based DDoS attacks. Furthermore, an analysis of the request headers indicated that almost 80 percent of the devices generating the traffic were smartphones and tablets.To read this article in full or to leave a comment, please click here

How Facebook Tells Your Friends You’re Safe in a Disaster in Under Five Minutes

In a disaster there’s a raw and immediate need to know your loved ones are safe. I felt this way during 9/11. I know I’ll feel this way during the next wild fire in our area. And I vividly remember feeling this way during the 1989 Loma Prieta earthquake.

Most earthquakes pass beneath notice. Not this one and everyone knew it. After ceiling tiles stopped falling like snowflakes in the computer lab, we convinced ourselves the building would not collapse, and all thoughts turned to the safety of loved ones. As it must have for everyone else. Making an outgoing call was nearly impossible, all the phone lines were busy as calls poured into the Bay Area from all over the nation. Information was stuck. Many tense hours were spent in ignorance as the TV showed a constant stream of death and destruction.

It’s over a quarter of a century later, can we do any better?

Facebook can. Through a product called Safety Check, which connects friends and loved ones during a disaster. When a disaster hits Safety Check prompts people in the area to indicate if they are OK or not. Then Facebook closes the worry loop by Continue reading

Getting to Know John Ryan, Business Development & Channels

 

Knowing the members of our Ansible community is important to us, and we want you to get to know the members of our team in (and outside of!) the Ansible office. Stay tuned to the blog to learn more about the people who are helping to bring Ansible to life.

This week we're happy to introduce you to John Ryan, who joined Ansible as head of business development and channels. John has more than 30 years of experience in business development, channels, sales and marketing in infrastructure software, open source and network security. He’s held leadership positions at Proofpoint, Apigee, Red Hat, IBM and Sun Microsystems.  John holds a B.S. in Computer Science from the University of Pittsburgh and an MBA from Case Western Reserve University.

Iran: Latest Nation to Host Critical Global Internet Infrastructure

As crippling economic sanctions are poised to be lifted by the United States, Iran is starting to emerge from its isolation as a regional and, in a very limited sense, global Internet player.  Iran continues to methodically build out its Internet infrastructure, working on its domestic connectivity (including IPv6), providing service to neighboring countries (such as Iraq and Afghanistan), stockpiling limited IPv4 address space, and providing a strategic terrestrial alternative to vulnerable submarine cables.

Recently, Iran began hosting a root DNS server, thereby potentially providing this critical service to the rest of the world.  In this blog, we’ll explore some of these latest developments and their challenges.  In November, European Internet registrar RIPE will hold its regional operator meeting (MENOG) in Tehran, where attendees from around the world will learn firsthand about recent developments in the fast-growing Iranian Internet.

K-root Debuts in Iran

As most readers of this blog will know, when you access any resource on the Internet by name (e.g., www.cnn.com), your computer must first convert this name into an IP address (e.g., 23.235.46.73), which it then uses to gain access to Continue reading

Don’t Miss the Brocade SDN Controller Webinar with Insights on OpenDaylight!

Join SDxCentral and Brocade for the SDN Controller Report webinar on September 29th. Register today!

Worth Reading: The changing mobile landscape

Rather than a large pool of potential suppliers who are strongly motivated to compete with each other by building to the specifications provided by the cellular access providers, the concentration of supply has lead to a different dynamic where the platform providers are able to effectively dictate their terms and conditions to the mobile access network operators. Interestingly this, in turn, has emboldened some of the larger application providers to flex their market muscles and in turn set forth in their own direction. via circle id

The post Worth Reading: The changing mobile landscape appeared first on 'net work.