Pi Is For…
Programming
In
Raspberry

Computers Don’t
Do Anything
Without
Instructions

Programming, or
Coding, is how we
tell computers what
to do using
instructions that
the computer
understands.

What Is A Computer Interface?

Jacquard Loom Interface - 1801

Switch Computer Interface - ENIAC 1945

1950’s - 1960’s Business
No Command Line Interface
1990’s Personal
Graphical User Interface (GUI)
Command Line Computer Interface
1970’s Personal
Command Line Interface Only
(Sometimes called Shell Or Console)

Python Uses A Command Line Interface?

ARM Cortex-A53 CPU
How Does Programming Work?

Hardware Specific, Very Fast But
Very Difficult For Human
Comprehension. This Is The Language
That The Computer Speaks.
ARM Cortex-A53 CPU
How Does Programming Work?

How Does Programming Work?
ARM Cortex-A53 CPU

Hardware Specific, Very Fast And
Somewhat Comprehendible For People.
ARM Cortex-A53 CPU
How Does Programming Work?

ARM Cortex-A53 CPU
How Does Programming Work?

High Level Languages Are Considered
Cross Platform and Comprehendible.
To Maintain Speed They Compile An
Assembly Or Machine Language
Version Of The Code Specifically
For The CPU.
ARM Cortex-A53 CPU
Quality Compilers Can Generate Quicker Code
C Often Used In Graphics and Operating Systems
How Does Programming Work?

ARM Cortex-A53 CPU
Quality Compilers Can Generate Quicker Code
C Often Used In Graphics and Operating Systems
How Does Programming Work?

ARM Cortex-A53 CPU
PYTHON BASIC
Dynamic high-level general-purpose
scripting languages (such as Python
and PERL) execute programs in real
time using pre-compiled API’s or
machine code. Their advantage is
that programs can be be constructed
from pre built blocks and combined
into complex programs.
PERL
Software Intermediary
How Does Programming Work?

How Does Programming Work?
ARM Cortex-A53 CPU - Linux
PYTHON CODE
Python Virtual Machine
Bytecode

How Does Programming Work?
PYTHON CODE
ARM Cortex-A53 CPU - Linux
Python Virtual Machine
AMD Athlon™ X4 CPU - Windows
Python Virtual Machine
Intel® Core™ i7 CPU - MAC OSX
Python Virtual Machine

Hello world! In Machine Code
Why Python?

Why Python?
Hello world! In Assembly Language

Why Python?
Hello world! In BASIC, C and Python

Why Python?
● Python Is A General Purpose Language
○ Many computer devices
○ Libraries for most applications.
● Large Standard Code Library
○ Standard Library runs on Raspberry Pi or CRAY Supercomputer.
● Can Be Compiled To Machine Language
○ Cython compiles Python code To C.
● Can Call C Code
○ Python ctypes
● Clean code
○ Employs indentation
○ No {..code in here..} or <div>..or stuff in here..<div>
● Libraries, Libraries, Libraries
○ The secret power of Python
○ 67,000 libraries (Jan 1, 2016)

Getting Started On Raspberry Pi
● https://www.raspberrypi.org/documentation/usage/python/
○ RUNNING PYTHON ON A RASPBERRY PI
○ INDENTATION
○ VARIABLES
○ COMMENTS
○ LISTS
○ ITERATION and RANGE
○ CREATING/SAVING PYTHON FILES
○ EXECUTING PYTHON FILES

Python Interactive Mode
Python Shell
Command Line Interface
Python Prompt
>>>
Getting Started On Raspberry Pi

Python Interactive Mode
Getting Started On Raspberry Pi

Getting Started On Raspberry Pi
Python Interactive Mode

Getting Started On Raspberry Pi
Python Run Module

Getting Started On Raspberry Pi
Python Run Module

Getting Started On Raspberry Pi
Python Run Module

Getting Started On Raspberry Pi
Python Run Module

CODE
https://trinket.io
Programming In Python - Overview

CODE
RESULT
(CONSOLE OUTPUT)
https://trinket.io
Programming In Python - Overview

https://trinket.io/python/81bea2e14c
Python Sequence Code

https://trinket.io/python/81bea2e14c
Python Sequence Code

https://trinket.io/python/883c20b4a3
Python Functions Code

https://trinket.io/python/883c20b4a3
Python Functions Code

https://trinket.io/python/883c20b4a3
Python Functions Code

https://trinket.io/python/81bea2e14c
Python Functions Code

https://trinket.io/python/883c20b4a3
Python Functions Code

• Python runs as a minimum with always available “built-in
libraries”.
• Libraries provide the code functionality
Python Built-In Libraries

https://trinket.io/python/df57cd9d6f
Python Import Standard Libraries

https://trinket.io/python/df57cd9d6f
Python Import Standard Libraries

Python Object Oriented Code

OBJECT
Python Object Oriented Code

OBJECT
PROPERTIES
Python Object Oriented Code

Python Object Oriented Code

https://trinket.io/python/a9a6112ca5
Python Object Oriented Code

https://trinket.io/python/d4e0f1f07d
Python Object Oriented Code

Python “Clean” Code

Python “Clean” Code
Indentation
and levels
used as
separators in
code. No curly
braces or
containers.

Python “Clean” Code
Minimal use of
colons, semi-
colons, etc.

External Libraries - Wikipedia
The Beatles Wikipedia Page

External Libraries - Wikipedia
Packages Located In The Python Package Index
(PyPI)

External Libraries - Wikipedia
Use Raspberry Pi Terminal To Install External
Libraries Using PIP

External Libraries - Wikipedia
“sudo pip install wikipedia” In Terminal Installs
The Python Wikipedia Library On Your Raspberry Pi

External Libraries - Wikipedia
Estimated 67,000 Libraries (Jan 1, 2016)

Review

Review
PYTHON CODE
ARM Cortex-A53 CPU - Linux
Python Virtual Machine
AMD Athlon™ X4 CPU - Windows
Python Virtual Machine
Intel® Core™ i7 CPU - MAC OSX
Python Virtual Machine

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