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Overview of Functions and Conditionals in Python Programming

This lecture covers essential concepts of functions and conditionals in Python, including their syntax, parameters, return values, and the importance of using them in programming. It provides insights on how to create functions, utilize parameters, and understand scope. Additionally, the lecture explains the purpose and structure of conditional statements (if, elif, else), alongside practical examples demonstrating their use. The session serves as a review, reinforcing the fundamental building blocks of writing effective Python code.

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Overview of Functions and Conditionals in Python Programming

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Presentation Transcript

  1. ITEC 109 Lecture 16 Functions (3) Conditionals

  2. Review • Functions • Parameters • Returns • Syntax • Scope

  3. Objectives • Review functions • Examples • Introduce iteration

  4. Functions • Why use them? • What is a parameter? • What is a return value

  5. Example def fun1(): fun2() printNow("Done") def fun2(): printNow("Test") fun1()

  6. Example def fun1(var1,var2): return var1+var2 printNow("Done") def fun2(): return int(raw_input()) x = fun2() y = fun2() z = fun1(x,y) printNow(z)

  7. Example def mystery(var1): printNow(var1) if (var1 > 25): return; else: mystery(var1+1) mystery(1)

  8. Conditionals • What is the purpose of if • What is the purpose of elif • What is the purpose of else • What is the syntax for the three?

  9. Example If you shoot a cow Then you get steak

  10. Choose your own adventure • Book where you make choices as you read • Choices you make impact the story • Wildly rich • Horrible deaths If you decide to start back home, turn to page 4. If you decide to wait, turn to page 5.

  11. Priorities

  12. Visually public static void main { //Code before //Code after } Only when if not met and condition is true if (condition) { } First choice else if (condition) Second choice { } else (condition) Last choice { }

  13. Structure • Expression (True or false) • All vars: <,>,==, != • Based on the word / expression a block of code gets executed

  14. Python • First choice = if • Second choice = elif • Third choice = elif • Last choice = else Linear progression Begins with if Ends with else

  15. Example var1=3 if (var1 > 3): printNow("1") elif (var1 < 3): printNow("2") else: printNow("3")

  16. Example x=3; y=4; if (x>3): printNow(“X is big”); elif (y <4): printNow(“Y is small”); elif (x == y): printNow(“Same”); else: printNow(“Can you see me now?”);

  17. Example • Can you guess the number between 1-10 that I’m thinking of exercise • Check to see if it is between 1 and 10 • Then say Exact if it is 5, Higher than my choice if is above 5, Lower than my choice if it is less than 5

  18. Chaining total=3; max=3; sum=4; //Scanner code to read in the values if (total == max): if (total < sum): printNow(“T < S”); else: printNow(“ T = M < S”);

  19. Review • Functions • Conditionals

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