Python Programming: An Introduction to Computer Science

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1 Pytho Programmig: A Itroductio to Computer Sciece Chapter 1 Computers ad Programs 1

2 Objectives To uderstad the respective roles of hardware ad software i a computig system. To lear what computer scietists study ad the techiques that they use. To uderstad the basic desig of a moder computer. 2

3 Objectives (cot.) To uderstad the form ad fuctio of computer programmig laguages. To begi usig the Pytho programmig laguage. To lear about chaotic models ad their implicatios for computig. 3

4 The Uiversal Machie A moder computer ca be defied as a machie that stores ad maipulates iformatio uder the cotrol of a chageable program. Two key elemets: Computers are devices for maipulatig iformatio. Computers operate uder the cotrol of a chageable program. 4

5 The Uiversal Machie What is a computer program? A detailed, step-by-step set of istructios tellig a computer what to do. If we chage the program, the computer performs a differet set of actios or a differet task. The machie stays the same, but the program chages! 5

6 The Uiversal Machie Programs are executed, or carried out. All computers have the same power, with suitable programmig, i.e. each computer ca do the thigs ay other computer ca do. 6

7 Program Power Software (programs) rule the hardware (the physical machie). The process of creatig this software is called programmig. Why lear to program? Fudametal part of computer sciece Havig a uderstadig of programmig helps you have a uderstadig of the stregths ad limitatios of computers. 7

8 Program Power Helps you become a more itelliget user of computers It ca be fu! Form of expressio Helps the developmet of problem solvig skills, especially i aalyzig complex systems by reducig them to iteractios betwee simpler systems. Programmers are i great demad! 8

9 What is Computer Sciece? It is ot the study of computers! Computers are to computer sciece what telescopes are to astroomy. E. Dijkstra The questio becomes, What processes ca be described? This questio is really, What ca be computed? 9

10 What is Computer Sciece? Desig Oe way to show a particular problem ca be solved is to actually desig a solutio. This is doe by developig a algorithm, a step-by-step process for achievig the desired result. Oe problem it ca oly aswer i the positive. You ca t prove a egative! 10

11 What is Computer Sciece? Aalysis Aalysis is the process of examiig algorithms ad problems mathematically. Some seemigly simple problems are ot solvable by ay algorithm. These problems are said to be usolvable. Problems ca be itractable if they would take too log or take too much memory to be of practical value. 11

12 What is Computer Sciece? Experimetatio Some problems are too complex for aalysis. Implemet a system ad the study its behavior. 12

13 Hardware Basics The cetral processig uit (CPU) is the brai of a computer. The CPU carries out all the basic operatios o the data. Examples: simple arithmetic operatios, testig to see if two umbers are equal. 13

14 Hardware Basics Memory stores programs ad data. CPU ca oly directly access iformatio stored i mai memory (RAM or Radom Access Memory). Mai memory is fast, but volatile, i.e. whe the power is iterrupted, the cotets of memory are lost. Secodary memory provides more permaet storage: magetic (hard drive, floppy), optical (CD, DVD) 14

15 Hardware Basics Iput devices Iformatio is passed to the computer through keyboards, mice, etc. Output devices Processed iformatio is preseted to the user through the moitor, priter, etc. 15

16 Hardware Basics Fetch-Execute Cycle First istructio retrieved from memory Decode the istructio to see what it represets Appropriate actio carried out. Next istructio fetched, decoded, ad executed. Lather, rise, repeat! 16

17 Programmig Laguages Natural laguage has ambiguity ad imprecisio problems whe used to describe complex algorithms. Programs expressed i a uambiguous, precise way usig programmig laguages. Every structure i programmig laguage has a precise form, called its sytax Every structure i programmig laguage has a precise meaig, called its sematics. 17

18 Programmig Laguages Programmig laguage like a code for writig the istructios the computer will follow. Programmers will ofte refer to their program as computer code. Process of writig a algorithm i a programmig laguage ofte called codig. 18

19 Programmig Laguages High-level computer laguages Desiged to be used ad uderstood by humas Low-level laguage Computer hardware ca oly uderstad a very low level laguage kow as machie laguage 19

20 Programmig Laguages Add two umbers: Load the umber from memory locatio 2001 ito the CPU Load the umber from memory locatio 2002 ito the CPU Add the two umbers i the CPU Store the result ito locatio 2003 I reality, these low-level istructios are represeted i biary (1 s ad 0 s) 20

21 Programmig Laguages High-level laguage c = a + b This eeds to be traslated ito machie laguage that the computer ca execute. Compilers covert programs writte i a high-level laguage ito the machie laguage of some computer. 21

22 Programmig Laguages Iterpreters simulate a computer that uderstads a high-level laguage. The source program is ot traslated ito machie laguage all at oce. A iterpreter aalyzes ad executes the source code istructio by istructio. 22

23 Programmig Laguages Compilig vs. Iterpretig Oce program is compiled, it ca be executed over ad over without the source code or compiler. If it is iterpreted, the source code ad iterpreter are eeded each time the program rus Compiled programs geerally ru faster sice the traslatio of the source code happes oly oce. 23

24 Programmig Laguages Iterpreted laguages are part of a more flexible programmig eviromet sice they ca be developed ad ru iteractively Iterpreted programs are more portable, meaig the executable code produced from a compiler for a Petium wo t ru o a Mac, without recompilig. If a suitable iterpreter already exists, the iterpreted code ca be ru with o modificatios. 24

25 The Magic of Pytho Whe you start Pytho, you will see somethig like: Pytho (r312:79149, Mar , 00:41:52) [MSC v bit (Itel)] o wi32 Type "copyright", "credits" or "licese()" for more iformatio. >>> 25

26 The Magic of Pytho The >>> is a Pytho prompt idicatig that Pytho is ready for us to give it a commad. These commads are called statemets. >>> prit("hello, world ) Hello, world >>> prit(2+3) 5 >>> prit("2+3=", 2+3) 2+3= 5 >>> 26

27 The Magic of Pytho Usually we wat to execute several statemets together that solve a commo problem. Oe way to do this is to use a fuctio. >>> def hello(): prit("hello") prit("computers are Fu") >>> 27

28 The Magic of Pytho >>> def hello(): prit("hello") prit("computers are Fu") >>> The first lie tells Pytho we are defiig a ew fuctio called hello. The followig lies are ideted to show that they are part of the hello fuctio. The blak lie (hit eter twice) lets Pytho kow the defiitio is fiished. 28

29 The Magic of Pytho >>> def hello(): prit("hello") prit("computers are Fu") >>> Notice that othig has happeed yet! We ve defied the fuctio, but we have t told Pytho to perform the fuctio! A fuctio is ivoked by typig its ame. >>> hello() Hello Computers are Fu >>> 29

30 The Magic of Pytho What s the deal with the () s? Commads ca have chageable parts called parameters that are placed betwee the () s. >>> def greet(perso): prit("hello",perso) prit ("How are you?") >>> 30

31 The Magic of Pytho >>> greet("terry") Hello Terry How are you? >>> greet("paula") Hello Paula How are you? >>> Whe we use parameters, we ca customize the output of our fuctio. 31

32 The Magic of Pytho Whe we exit the Pytho prompt, the fuctios we ve defied cease to exist! Programs are usually composed of fuctios, modules, or scripts that are saved o disk so that they ca be used agai ad agai. A module file is a text file created i text editig software (saved as plai text ) that cotais fuctio defiitios. A programmig eviromet is desiged to help programmers write programs ad usually icludes automatic idetig, highlightig, etc. 32

33 The Magic of Pytho # File: chaos.py # A simple program illustratig chaotic behavior def mai(): prit("this program illustrates a chaotic fuctio") x = eval(iput("eter a umber betwee 0 ad 1: ")) for i i rage(10): x = 3.9 * x * (1 - x) prit(x) mai() We ll use fileame.py whe we save our work to idicate it s a Pytho program. I this code we re defiig a ew fuctio called mai. The mai() at the ed tells Pytho to ru the code. 33

34 The Magic of Pytho >>> This program illustrates a chaotic fuctio Eter a umber betwee 0 ad 1: >>> 34

35 Iside a Pytho Program # File: chaos.py # A simple program illustratig chaotic behavior Lies that start with # are called commets Iteded for huma readers ad igored by Pytho Pytho skips text from # to ed of lie 35

36 Iside a Pytho Program def mai(): Begiig of the defiitio of a fuctio called mai Sice our program has oly this oe module, it could have bee writte without the mai fuctio. The use of mai is customary, however. 36

37 Iside a Pytho Program prit("this program illustrates a chaotic fuctio") This lie causes Pytho to prit a message itroducig the program. 37

38 Iside a Pytho Program x = eval(iput("eter a umber betwee 0 ad 1: ")) x is a example of a variable A variable is used to assig a ame to a value so that we ca refer to it later. The quoted iformatio is displayed, ad the umber typed i respose is stored i x. 38

39 Iside a Pytho Program for i i rage(10): For is a loop costruct A loop tells Pytho to repeat the same thig over ad over. I this example, the followig code will be repeated 10 times. 39

40 Iside a Pytho Program x = 3.9 * x * (1 - x) prit(x) These lies are the body of the loop. The body of the loop is what gets repeated each time through the loop. The body of the loop is idetified through idetatio. The effect of the loop is the same as repeatig this two lies 10 times! 40

41 Iside a Pytho Program for i i rage(10): x = 3.9 * x * (1 - x) prit(x) These are equivalet! x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) x = 3.9 * x * (1 - x) prit(x) 41

42 Iside a Pytho Program x = 3.9 * x * (1 - x) This is called a assigmet statemet The part o the right-had side (RHS) of the = is a mathematical expressio. * is used to idicate multiplicatio Oce the value o the RHS is computed, it is stored back ito (assiged) ito x 42

43 Iside a Pytho Program mai() This last lie tells Pytho to execute the code i the fuctio mai 43

44 Chaos ad Computers The chaos.py program: def mai(): prit("this program illustrates a chaotic fuctio") x = eval(iput("eter a umber betwee 0 ad 1: ")) for i i rage(10): x = 3.9 * x * (1 - x) prit(x) mai() For ay give iput, returs 10 seemigly radom umbers betwee 0 ad 1 It appears that the value of x is chaotic 44

45 Chaos ad Computers The fuctio computed by program has the geeral form kx ( )(1- x) where k is 3.9 This type of fuctio is kow as a logistic fuctio. Models certai kids of ustable electroic circuits. Very small differeces i iitial value ca have large differeces i the output. 45

46 Chaos ad Computers Iput: Iput:

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