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Python Programming - II. The Basics
The document covers a comprehensive introduction to Python programming, including fundamental topics such as controlling program flow, data structures, object-oriented programming, and practical exercises. It provides guidance on using Python syntax, handling exceptions, and manipulating strings, along with various programming concepts such as functions and input/output operations. Additionally, it offers programming exercises to reinforce learning through practical applications.
Python Programming - II. The Basics
- 1. Engr. Ranel O.Padon PYTHON PROGRAMMING II. The Basics
- 2. PYTHON PROGRAMMING TOPICS I • Introduction to Python Programming II • Python Basics III • Controlling the Program Flow IV • Program Components: Functions, Classes, Modules, and Packages V • Sequences (List and Tuples), and Dictionaries VI • Object-Based Programming: Classes and Objects VII • Customizing Classes and Operator Overloading VIII • Object-Oriented Programming: Inheritance and Polymorphism IX • Randomization Algorithms X • Exception Handling and Assertions XI • String Manipulation and Regular Expressions XII • File Handling and Processing XIII • GUI Programming Using Tkinter
- 4. RUNNING A COMPUTERPROGRAM Source Translator Target Low-Level Language Assembler Machine Code High-Level Language Compiler Interpreter
- 5. RUNNING A PYTHONPROGRAM to write & run a Python program you need a Text Editor and a Python Interpreter (preferably Version 2.x since version 3.x is not yet mainstream) Possible Ways (Common Ones) 1. Atom/Notepad++/Sublime Text and command prompt 2. Atom/Notepad++/Sublime Text and IDLE 3. IDLE 4. PyCharm, PyScripter, Aptana Studio, NINJA IDE…
- 6. HELLO WORLD as asalute to all programmers in the world, beginning programmers usually print in the console the infamous Hello World mystical line print “Hello World”
- 7. HELLO WORLD IN2 LINES print “Hello” print “World” in Python, the print statement will always move the cursor to the next line after printing
- 8. HELLO WORLD, SUPRESSINGNEWLINES print “Hello”, print “World” A comma (,) will suppress the auto newline insertion in print statements; it will add a space instead.
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- 10. FORCING NEW LINES& TABS print “Hello ntWorld ntPo!” t = tab
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- 12. EXERCISE Using Escape Sequences,print the following, including the punctuations: “Mahal ko po si Migueeeel!”, sabi ni Amanda. “Hindi maari yan, lalo na’t si Miguel ay isang Halimaw!”, ang tugon ng kanyang ina.
- 13. COMMENTS comments don’t doanything except to serve as a documentation part of a program use comments as often as you can because programmers tend to forget what they’ve programmed after a month or so #this is a comment print ‘Magandang Araw Po!’ #this function computes the sum of two integers def sum(x, y): ...
- 14. RAW INPUT, TEXT x = raw_input(“Unang Salita:”) y = raw_input(“Pangalawang Salita:”) print x + y raw_inputis a built-in function; it’s included in the standard library & returns a string data type
- 15. RAW INPUT, TEXTTO INTEGER x = int(raw_input(“Unang Numero:”)) y = int(raw_input(“Pangalawang Numero:”)) print x + y int is a built-in function; it’s included in the standard library & converts a string to integer
- 16. INPUT, AUTO TEXTTO INTEGER x = input(“Unang Numero:”) y = input(“Pangalawang Numero:”) print x + y input is a built-in function; it’s included in the standard library & converts a string number to integer.
- 17. VARIABLE ASSIGNMENT x = input(“Unang Numero:”) y = input(“Pangalawang Numero:”) sum = x + y print “Ang sum po ay”, sum results couldbe printed directly or assigned to a variable before printing
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- 27. STRING FORMATTING 1. Rounding-offfloating-point values 2. Representing numbers in exponential notation 3. Aligning a column of numbers 4. Right-justifying and left-justifying outputs 5. Inserting characters or strings at precise locations 6. Displaying with fixed-size field widths and precision
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- 35. COMMON ERROR Error: insertingspaces between the pair of symbols: ==, !=, >= and <=
- 36. COMMON ERROR reversing theorder of the pair of operators in any of the operators: ! =, <>, >= and <= Error: writing them as =!, ><, => and =<
- 37. COMMON ERROR Confusing theequality operator == with the assignment symbol = is an error. The equality operator should be read “is equal to” and the assignment symbol should be read “gets,” “gets the value of” or “is assigned the value of.” In Python, the assignment symbol causes a syntax error when used in a conditional statement.
- 38. KEYWORDS/RESERVED WORDS They cannotbe used as identifiers.
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- 43. COMMON ERROR Failure toinsert a colon (:) in an if structure. Failure to indent the body of an if structure.
- 44. LINE CONTINUATION A lengthystatement may be spread over several lines with the backslash () line continuation character. If a single statement must be split across lines, choose breaking points that make sense, such as after a comma in a print statement or after an operator in a lengthy expression.
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- 46. ZEN OF PYTHON(import this) q typing import this will yield an awesome narrative
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- 48. PRACTICE EXERCISE 2 Writea program that requests the user to enter two numbers and prints the sum, product, difference and quotient of the two numbers.
- 49. PRACTICE EXERCISE 3 Writea program that reads in the radius of a circle and prints the circle’s diameter, circumference and area. Use the constant value 3.14159 for π. Do these calculations in output statements.
- 50. PRACTICE EXERCISE 4 Writea program that reads in two integers and determines and prints whether the first is a multiple of the second.
- 51. PRACTICE EXERCISE 5 Writea program that reads in a 3-digit number, dissects the number and prints the 3 individual numbers. For example, 214 will be printed as: Hundreds: 2 Tens: 1 Ones: 4
- 52. PRACTICE EXERCISE 5| SOLUTION a = 14 print "Tens:", a/10 print "Ones:", a%10
- 53. PRACTICE EXERCISE 5| SOLUTION a = 214 print "Hundreds:", a/100 hundreds_remainder = a%100 print "Tens:", hundreds_remainder/10 tens_remainder = hundreds_remainder%10 print "Ones:", tens_remainder
- 54. PRACTICE EXERCISE 5| DEBUGGING a = 214 print "Hundreds:", a/100 remainder_100 = a%100 print remainder_100 print "Tens:", remainder_100/10 remainder_10 = remainder_100%10 print "Ones:", remainder_10
- 55. PRACTICE EXERCISE 5| DEBUGGING a = 214 print "Hundreds:", a/100 remainder_100 = a%100 print "Tens:", remainder_100/10 remainder_10 = remainder_100%10 print "Ones:", remainder_10
- 56. PRACTICE EXERCISE 5| SOLUTION a = input(“Magbigay ng 3-digit na numero:”) print "Hundreds:", a/100 remainder_100 = a%100 print "Tens:", remainder_100/10 remainder_10 = remainder_100%10 print "Ones:", remainder_10
- 57. PRACTICE EXERCISE 6 Writea program that reads in 3 integers and determines and prints the largest number.
- 58. PRACTICE EXERCISE 6| SOLUTION a = 2 b = 1 c = 4 max = a if b > max: max = b if c > max: max = c print max
- 59. PRACTICE EXERCISE 6| SOLUTION a = input("Unang Numero Po:") b = input("Pangalawang Numero Po:") c = input("Pangatlong Numero Po:") max = a if b > max: max = b if c > max: max = c print max
- 60. PRACTICE EXERCISE 7 Writea program that reads in 3 integers and determines and prints the smallest & largest numbers.
- 61. PRACTICE EXERCISE 7| SOLUTION a = input("Unang Numero Po:") b = input("Pangalawang Numero Po:") c = input("Pangatlong Numero Po:") max = a min = a if b > max: max = b if c > max: max = c print max if b < min: min = b if c < min: min = c print min
- 63. The Amusing Evolutionof a Programmer http://www.ariel.com.au/jokes/The_Evolution_of_a_Programmer.html
- 64. REFERENCES q Deitel, Deitel,Liperi, & Wiedermann - Python: How to Program (2001). q Disclaimer: Most of the images/information used here have no proper source citation, and I do not claim ownership of these either. I don’t want to reinvent the wheel, and I just want to reuse and reintegrate materials that I think are useful or cool, then present them in another light, form, or perspective. Moreover, the images/information here are mainly used for illustration/educational purposes only, in the spirit of openness of data, spreading light, and empowering people with knowledge. J