Download Python Overview

Python Overview
Installation, Sample Usage, Strings and OOP
Software Quality Assurance
Telerik Software Academy
http://academy.telerik.com
Table of Contents
 Installing
and Running Python
 Fundamentals of Python development
 Data types
 Control structures: loops, conditionals
 Functions
 Object-oriented programming
Installing Python
On 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 outof-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
for i in range(5):
print(i)
 Sum the numbers from 5 to 9
sum = 0
for i in range(5, 10):
sum += I
print(sum)
Significant whitespace
matters a lot
$ python
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 Fundamentals
Data 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 Types
Live Demo
Control Structures
 Python supports conditionals:
if conditionOne:
# run code if conditionOne is True
elif conditionTwo:
# run code if conditionOne is False
#
but conditionTwo is True
else
# 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 Statements
Live Demo
Loops
 There are two types of loops in Python
 for loop
for 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 loop
number = 1024
binNumber = '';
while number >= 1:
binNumber += '%i'%(number%2)
number /= 2
print(binNumber[::-1])
Loops
Live Demo
Functions in Python
Separate 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 Python
Live Demo
Modules in Python
How 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 numeralSystems
print(numeralSystems.toBin(1023))
print(numeralSystems.toHex(1023))
 A single function:
from numeralSystems import toBin as bin
 Or some functions
from numeralSystems import toBin as bin, toHex as hex
Modules in Python
Live 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 OOP
Live Demo
Python Overview
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