Installation, Sample Usage, Strings and OOP Telerik Software Academy Software Quality Assurance

 Installing and Running Python  Fundamentals of Python development  Data types  Control structures: loops, conditionals  Functions  Object-oriented programming

On MAC, Linux and Windows

 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  Add the installation path to System Variables $PATH

Live Demo

 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) print(i) sum = 0 for i in range(5, 10): sum += I sum += Iprint(sum)  Sum the numbers from 5 to 9 Significant whitespace matters a lot

 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

Data types, Control Structures and more

 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)

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 Python supports conditionals: if conditionOne: # run code if conditionOne is True # run code if conditionOne is True elif conditionTwo: # run code if conditionOne is False # run code if conditionOne is False # but conditionTwo is True # 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

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 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 # 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]); print('Hi! I am %s!'%names[i]);  while loop number = 1024 binNumber = ''; while number >= 1: binNumber += '%i'%(number%2) binNumber += '%i'%(number%2) number /= 2 number /= 2print(binNumber[::-1])

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Separate the code in smaller and reusable pieces

 Functions in Python:  Are defined using the keyword "def"  Have an identifier  A list of parameters  A return type def toBin(number): bin = '' bin = '' while number >= 1: while number >= 1: bin += '%i'%(number%2) bin += '%i'%(number%2) number /= 2 number /= 2 return bin[::-1] return bin[::-1]

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How to separate the code in different modules

 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)) from numeralSystems import toBin as bin  A single function:  Or some functions from numeralSystems import toBin as bin, toHex as hex

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 Python has classes and inheritance class Person: lastPersonId = 0 lastPersonId = 0 def __init__(self, name): def __init__(self, name): self.__id = ++lsatPersonId self.__id = ++lsatPersonId self.__name = name self.__name = name def getId(): def getId(): return self.__id return self.__id def getName(): def getName(): return self.__name return self.__name def setName(newName): def setName(newName): self.__name = newName self.__name = newName

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