Python OverviewInstallation, Sample Usage, Strings and OOP

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Table of Contents

Installing and Running Python Fundamentals of Python

development Data types Control structures: loops,

conditionals Functions Object-oriented programming

Installing PythonOn MAC, Linux and Windows

Installing Python

On MAC Homebrew can be used$ brew install python

On Linux Part of Linux is built with Python, so it

comes out-of-the-box On Windows

Download the installer from https://www.python.org/

Add the installation path to System Variables $PATH

Installing Python on Windows and MAC

Live Demo

Running Python Open the CMD/Terminal and run: You can run python code:

Print the numbers from 0 to 4

$ python

for i in range(5): print(i)

sum = 0for i in range(5, 10): sum += Iprint(sum)

Sum the numbers from 5 to 9

Significant whitespace matters

a lot

Significant Whitespace

Significant whitespace is a way to write code in python This is actually the identation

Significant whitespace creates blocks in python code It is the equivalent of curly brackets

({ }) in other languages

Python FundamentalsData types, Control Structures and

more

Python Fundamentals

Python supports all the primary data types: int - integer numbers

int(intAsString) parses a string to int float - floating-point numbers

float(floatAsString) parses a string to float

none – like null bool – Boolean values (True and

False)

Data TypesLive Demo

Control Structures Python supports conditionals:if conditionOne: # run code if conditionOne is Trueelif conditionTwo: # run code if conditionOne is False # but conditionTwo is Trueelse # run code if conditionOne and # conditionTwo are False

The conditions are True-like and False-like i.e. "String", 0, none are evaluated to

True While ""(empty string), any number or

object are evaluated to False

Conditional StatementsLive Demo

Loops There are two types of loops in Python for loopfor i in range(5):

# run code with values of i: 0, 1, 2, 3 and 4

names = ['Doncho', 'Asya', 'Evlogi', 'Nikolay', 'Ivaylo']for i in range(len(names)): print('Hi! I am %s!'%names[i]);

while loopnumber = 1024binNumber = '';while number >= 1: binNumber += '%i'%(number%2) number /= 2print(binNumber[::-1])

LoopsLive Demo

Functions in PythonSeparate the code in smaller and

reusable pieces

Functions in Python Functions in Python:

Are defined using the keyword "def" Have an identifier A list of parameters A return type

def toBin(number): bin = '' while number >= 1: bin += '%i'%(number%2) number /= 2 return bin[::-1]

Functions in PythonLive Demo

Modules in PythonHow to separate the code in different

modules

Modules in Python Python applications are separated

into modules These module represent just a list of

functions and or classes To use all functions from a module numeralSystems:

import numeralSystemsprint(numeralSystems.toBin(1023))print(numeralSystems.toHex(1023))

from numeralSystems import toBin as bin

A single function:

Or some functionsfrom numeralSystems import toBin as bin, toHex as hex

Modules in PythonLive Demo

Classes and OOP

Classes and OOP

Python has classes and inheritance

class Person: lastPersonId = 0 def __init__(self, name): self.__id = ++lsatPersonId self.__name = name def getId(): return self.__id def getName(): return self.__name def setName(newName): self.__name = newName

Classes and OOPLive Demo

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Python Overview

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