Error Detection and Corrections:
– Communication and Error Detection
– “card magic” – matrix of bits for sending images, or other data
– XOR, in logics and in python
– XOR for ints – what does it mean?
– Code for parity checking in 2d matrix
– Israeli ID – finding & checking the last digit
– RAID – how to backup many Hard disks using single disk with parity checks
  (no implementation)
– Nearest neighbor for detecting errors in strings (e.g. spell checker) – no implementation

Image Processing:
– Introduction – pixels for representing images, bit depth
– the class matrix, drawing pixles, lines and functions
– displaying the images with plt library
– drawing boxes with different colors

Links:

• Lecture code and PDF

Multithreaded program contains two or more parts that can run concurrently and each part can handle a different task at the same time making optimal use of the available resources specially when your computer has multiple CPUs.
A process is an executing instance of an application. for example, when you double-click the Microsoft Word icon, you start a process that runs Word. A thread is a path of execution within a process. Also, a process can contain multiple threads. When you start Word, the operating system creates a process and begins executing the primary thread of that process. It’s important to note that a thread can do anything a process can do. But since a process can consist of multiple threads, a thread could be considered a ‘lightweight’ process. Thus, the essential difference between a thread and a process is the work that each one is used to accomplish. Threads are used for small tasks, whereas processes are used for more ‘heavyweight’ tasks – basically the execution of applications.

More topics covered:

• threading library
• urllib.request library
• urllib.request download from web using urlretrieve
• daemon thread
• thread.isAlive
• daemon thread
• thread.name
• Thread target, args = (x,)
• threading.currentThread()
• urllib.request.urlopen(url).info().get(‘content-length‘)

Links:

• Class code: thread introduction
• Class code: solution ex 1
• Class code: solution ex 2 – global
• Class code: solution ex 2 – oop
• Class code: thread with parameter
• Class code: download url using thread
• threading – tutorials point
• Python threading – python docs
• Python urllib.request – python docs 
• Home Work!
• Lesson Summary Video!