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OPS435 Python Lab 6

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'''** DO NOT USE - TO BE UPDATED FOR CENTOS 8.0 **'''
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= LAB OBJECTIVES =
* Create new type of objects using the Class construct and investigate different ways in using them. :Python is an object oriented programming language. Python uses the concept of "objectsobject" to store data(attributes) and code(methods) efficiently for later use. By using objects, programming languages gain the advantage of making large/complex programs into smaller and modular objectscodes, which can be used or shared with other codeusers/programs. In Python, almost everything that we have used is actually an object with a specific purpose, however starting in this lab we will create our own objects, and investigate different ways to use them.
== PYTHON REFERENCE ==
:In previous labs, you have been advised to make notes and use online references. This also relates apply to learning about objected object oriented programming to help becoming "overwhelmed" with the volume of information in this lab.
:Below is a table with links to useful online Python reference sites (by category)document for Classes and objects. You may find these references useful when performing assignments should study the information given below and make sure you understand the key concepts introduced and labsdiscussed before start working on this lab.
{| class="wikitable" | style="margin-left:20px; border: 2px solid black;"
|- style="background-color:white;border:none;"
| style="border: 2px solid black;" valign="top"|
:Handling Errors &amp; ExceptionsUsing Classes
| style="border: 2px solid black;" valign="top"|
:[https://docs.python.org/3/tutorial/errorsclasses.html Errors &amp; ExceptionsClasses]
|- style="background-color:white;border:none;"
| style="border: 2px solid black;" valign="top"|
:Built-in ExceptionsClasses and Objects
| style="border: 2px solid black;" valign="top"|
:[httpshttp://docsgreenteapress.python.orgcom/3thinkpython2/libraryhtml/exceptionsthinkpython2016.html Built-in ExceptionsThink Python Chapter 15]
|- style="background-color:white;border:none;"
| style="border: 2px solid black;" valign="top"|
:ListsClasses and functions
| style="border: 2px solid black;" valign="top"|
:[httpshttp://docsgreenteapress.python.orgcom/3thinkpython2/tutorialhtml/introductionthinkpython2017.html#lists ListsThink Python Chapter 16]
|- style="background-color:white;border:none;"
| style="border: 2px solid black;" valign="top"|
:DictionariesClasses and methods
| style="border: 2px solid black;" valign="top"|
:[httpshttp://docsgreenteapress.python.orgcom/3thinkpython2/tutorialhtml/datastructuresthinkpython2018.html#dictionaries DictionariesThink Python Chapter 17]
|- style="background-color:white;border:none;"
| style="border: 2px solid black;" valign="top"|
:Using Classes
| style="border: 2px solid black;" valign="top"|
:[https://docs.python.org/3/tutorial/classes.html Classes]
|}
 
== Key Concepts related to Python Class and Object ==
* Programmer-defined types
* Class Object
* Class methods: __init__, __str__, etc
* Class instance: attributes and methods
* Object instantiation
* Object Attributes
* Pure Function
* Scopes and Namespaces: local, nonlocal, and global
* Class definition syntax
* Class and Instance variables
* Iterators and Generators
 
* Operator overloading
= INVESTIGATION 1: Creating Classes =
== PART 1 - Creating a Class ==
:Each object of a class that we write in Python can contain variables, functions, code, but none of the code is executed or run until the class is used to create an object. Remember that the class is a blueprint for how your object will work, the object that will be created is what will actually be running the code. This part of a class works in the same way as a function definition, the function doesn't run until it's executed, code inside classes doesn't run until the they are made into objects.
:'''Perform the Following Steps:'''
:# Have a look at the contents of the object student1:<source lang="python">
print(student1.name)
print(student1.number)print(student1.courses)
student1.displayStudent()
</source>
:# Take a closer look at some of these different attributes and methods.<source lang="python">
print(student2.name)
print(student2.number)print(student2.courses)
student2.displayStudent()
</source>
::*The script should contain no errors
:::'''Sample Run 1:'''<source lang="python">
python3 ./lab6a.py
Student Name: John
Student Number: 013454900
['cpp244', 'ipc144']
</source>
:::'''Sample Run 2 (with import into ipython3):'''<source lang="python">
from lab6a import Student
student1.displayStudent()
# Will print: 'Student Name: Jack\nStudent Number: 931686102'
student1.displayGPA()
# Will print: 'GPA of student Jack is 1.0'
student1.displayCourses()
# Will print: ['ops535']
student2 = Student('Jen', 987654321)
 
student2.addGrade('uli101', 0.0)
student2.displayGPA()
# Will print: 'GPA of student Jen is 0.0'
student2.displayCourses()
# Will print: []
</source>
::3. Exit the ipython3 shell, download Download the checking script and check your work. Enter the following commands from the bash shell.<source lang="bash">
cd ~/ops435/lab6/
pwd #confirm that you are in the right directory
python3 ./CheckLab6.py -f -v lab6a
</source>
::4. Before proceeding, make certain that you identify any and all errors in lab6a.py. When the checking script tells you everything is OK before proceeding - proceed to the next step.
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