Selection: Non-linear programs

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Presentation transcript:

Selection: Non-linear programs Introduction to Python

Learning objectives Use selection statements if, else and elif in a program Learn how to use different comparison operators Use indentation correctly to define a block of code

What exactly does this program do? #Password Checker print("Welcome to PGO Security Systems") print("*******************************") password = input("Enter your password: ") if password == "abcd1234": print("Access Granted") else: print("Access Denied") print("Press ENTER to exit the program")

Indentation! if password == "abcd1234": print("Access Granted") else: Python requires indentation as part of the syntax Indentation signifies the start and end of a block of code Programs will not run without correct indentation if password == "abcd1234": print("Access Granted") else: print("Access Denied") print("Press ENTER to exit the program")

Using an IF statement might get away with it Else busted An IF Statement uses Selection IF forces a decision If condition Then do this Else do that If nobody saw me do it Then might get away with it Else busted

IF syntax age = int(input("Enter age: ")) if age >= 18: print ("Adult") else: print ("Child")

Greater than or equal to Comparison operators Operator Meaning Example Evaluates to == equal to 7==7 True != not equal to 6!=7 > Greater than 7>6 < Less than 5<8 >= Greater than or equal to 6>=8 False <= Less than or equal to 7<=7

Who uses IF statements? Thinking of a mobile phone, for example, where might an IF Statement appear in its coding?

Write a program Write a simple program that might be used inside a police speed camera The Requirements are: It must accept the driver’s speed IF the speed is over 70mph, a message “Issue Fine” should appear on the speed gun Otherwise it should display “No Action”

The ELIF statement if grade >= 80: print("Distinction") If gives you two options ELIF stands for Else, If and gives you more options You can use it as many times as you like if grade >= 80: print("Distinction") elif grade >= 70: print("Merit") elif grade >= 60: print("Pass") else: print("Fail")

Using the ELIF statement Add an ELIF statement to the Speeding program Issue a warning between 70 and 75mph Only issue a fine for 75mph and over