dpapathanasiou

#!/usr/bin/env python

"""
A breadth-first search implementation from:

"Python Algorithms: Mastering Basic Algorithms in the Python Language"

by  	Magnus Lie Hetland

ISBN: 	9781484200551 

dpapathanasiou

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dpapathanasiou

SchemaSpy is a neat tool to produce visual diagrams for most relational databases.

Here's how to use it to generate schema relationship diagrams for PostgreSQL databases:

1. Download the jar file from here (the current version is v6.1.0)

2. Get the PostgreSQL JDBC driver (unless your installed version of java is really old, use the latest JDBC4 jar file)

3. Run the command against an existing database. For most databases, the schema (-s option) we are interested in is the public one:

dpapathanasiou

Rationale

The Raspberry Pi Model A+ has just a single usb port, so getting the wifi configured has to done by editing /etc/network/interfaces from a command line prompt.

These instructions assume the Raspbian OS on the SD card, and a usb wifi adapter that supports the RTL8192cu chipset, since the current Raspbian has built-in support for it.

Before the first boot

1. Put a keyboard in the usb slot
2. Connect the HDMI slot to a monitor

dpapathanasiou

Create the Certificate Signing Request (CSR) file

openssl req -nodes -newkey rsa:4096 -keyout example_com.key -out example_com.csr

Prepare the Bundle file

Unzip the file Comodo sends back and create a single certificate bundle file.

dpapathanasiou

Based on the Host communication instructions, but with a tweak for when the usb0 address is not found:

$ /sbin/ip link set usb0 up
Cannot find device "usb0"

Because of the predictable network interface name scheme, though, usb0 may be renamed to something else:

dpapathanasiou

#!/usr/bin/env python3

"""
simple_kv_service.py

A simple example of a key-value (kv) storage and lookup service,
accessible over http/rest:

http://[host]:[port]/set?somekey=somevalue  => assigns "somevalue" to "somekey"
http://[host]:[port]/get?key=somekey        => looks up "somekey" and returns its value, if it exists

dpapathanasiou

#!/usr/bin/env python

"""
An iterative implementation of depth-first search from:

"Python Algorithms: Mastering Basic Algorithms in the Python Language"

by  	Magnus Lie Hetland

ISBN: 	9781484200551 

dpapathanasiou

#!/usr/bin/env python

"""
An implementation of the Bellman-Form algorithm from:

"Python Algorithms: Mastering Basic Algorithms in the Python Language"

by  	Magnus Lie Hetland

ISBN: 	9781484200551 

dpapathanasiou

#!/usr/bin/env python

"""
A breadth-first search implementation from:

"MIT Open CourseWare: Introduction to Algorithms"

Lecture 13: Breadth-First Search
https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-006-introduction-to-algorithms-fall-2011/lecture-videos/lecture-13-breadth-first-search-bfs/