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CSCI/CMPE 4341 Topic: Programming in Python Chapter 1: Introduction to Python

Learn the basics of Python programming, including the requirements of the course, components of a computer system, the evolution of programming languages, and the difference between structured programming and object-oriented programming.

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CSCI/CMPE 4341 Topic: Programming in Python Chapter 1: Introduction to Python

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  1. CSCI/CMPE 4341 Topic: Programming in PythonChapter 1: Introduction to Python Xiang Lian The University of Texas – Pan American Edinburg, TX 78539 lianx@utpa.edu

  2. Objectives • In this chapter, you will • Know requirements of this course • Recall basic components in a computer system • Learn the evolution of programming language • Refresh your memory about the structured programming vs. object-oriented programming • History of Python

  3. Background Required • C++ Programming • If you made an A in 1370/1170 you will do fine with some effort • If you have already taken 2380, you will find this course not very difficult • You need to be able to look up how to get things done (for example, look up syntax)

  4. Programming, Programming, Programming • This class is unlike other courses in that you will spend a lot of time doing actual programming • You should never copy a program from someone else • Even if your program does not perform as good as someone else’s, you should submit what you have • You should not hesitate to ask questions in class

  5. Assignments • Unless I announce it, programs are due in one week after assignment is given in class, or posted • Occasionally, I will give two weeks for difficult programs • You should work on a program the same day it is assigned • That way you can ask questions during the following class period

  6. Use of the Textbook • I will not be covering chapter by chapter • I will cover important points needed to complete the assignments • You need to search the index in the back to find the topic needed for each assignment • You can also obtain help from websites of online resources

  7. Versions of Python • Python IDE software: • https://www.python.org/downloads/ • Python 2.2.X • Python 3.4.X • You will find differences for different versions Python • Thus, in your assignments, you need to specify which version (3.4.2 recommended) you are using

  8. The Time for Class • I expect to hold the class for little over an hour each time, with a 10-minute break • For assignments, please do not exchange programs with each other, just ideas • For projects, you can discuss the project with your study group members

  9. Study Group • Please form a team with 3-4 team members • Each team needs to finish one programming project, including: • A project report (e.g., problem description, background, solution, implementation, experimental settings, empirical evaluation, and screen captures of graphical interface); • A statement of tasks for each team member; • Source code; • Demonstration (5 minutes); and • Presentation (10-15 minutes).

  10. Python 3.4 Command Line Python 3.4 GUI

  11. CSCI 1380: Elements of a Computer System • Hardware • CPU • Main memory • Secondary storage • Input / Output devices • Software • System programs • Application programs (e.g. Python IDE)

  12. Programming Languages • Machine language • Assembly language • High-level language • E.g., Visual Basic, C, C++, Visual C#, Java, Python

  13. Structured (Procedural) Programming Technology • Early Software Development • Complex and costly for businesses (1960s) • Costs exceeded budgets • Final products unreliable • Research led to structured programming • Disciplined approach to programming • Programs clear and easy to modify • Several languages resulted from research • C, Pascal, Ada

  14. Object-Oriented Programming Technology • We humans are very good in recognizing and working with objects, such as a pen, a dog, or a human being • We learned to categorize them in such a way that make sense to us. • We may categorize them as animate object, inanimate objects, pets, friends, etc.

  15. Object-Oriented Programming Technology(cont'd) • We some times classify objects based on their attributes, for example, green apples or red apples, fat or slim people, etc. • If you think about it each object has many attributes. • If I ask you list the attributes of an orange, you probably could list many things such as color, shape, weight, smell, etc.

  16. Object-Oriented Programming Technology (cont'd) • In addition to attributes, all objects exhibit behaviors. • A dog eats, barks, wags its tail, plays, and begs. • A dog exhibits many more other behaviors than this short list. • Another thing we need to remember about objects is that objects interact between each other

  17. History of Python • Created in 1989 by Guido van Rossum • Created as a scripting language for administrative tasks • Based on All Basic Code (ABC) and Modula-3 • Added extensibility • Named after comic troupe Monty Python • Released publicly in 1991 • Growing community of Python developers • Evolved into well-supported programming language

  18. Python • Python is a scripting language • It is not compiled as an executable file • Python • Structured programming • Like C • Object-oriented programming • Like C++ • Class and object

  19. To Get Python Tutorial/Documentation • Visit: • Python How to Program, Deitel et al. • Learning to Program Using Python, Cody Jackson • Python Documentation

  20. Hello Program # Fig. 2.1: fig02_01.py # Printing a line of text in Python. print ("Welcome to Python Programming Class!") # Results: # Welcome to Python Programming Class! Note: parentheses are needed for Python 3.4.X, but not necessary for Python 2.2.X (used in Textbook)

  21. Hello Program (cont'd) • print ("Welcome to Python Programming Class!") • print ("-- Xiang!") ----------------------------------------------------------- • print ("Welcome to Python Programming Class! \n-- Xiang!")

  22. Your First Assignment • Assignment #1 • The purpose of this assignment is to practice writing to shell and command-line window using Python 3.4. It is a simple assignment. • Please submit Program listing and a screen capture of the program run. • Follow the textbook examples to add comments as documentation.

  23. Assignment Submission • Make sure to include your name, assignment number, date due and date completed on each assignment you submit • Assignment should be submitted in a zip folder with your name and assignment number appearing on the tab • Submit your assignments to the Blackboard

  24. Exercises • Install Python 3.4 on your machine • Find a good Python IDE (other than that on www.python.org) for programming graphical user interface (GUI) • How do you output the string “Total Square Feet: 1238” to the shell/command-line window. • Assume that 1238 in an integer stored in a variable called sqFt. • Describe 3 differences of Python from C++

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