05_If_Else.md

05 If and Else

5.1 Go Left and Go Right, Make Decision with if

if key work used with comparison check like below

            givenCommand = "right"

            if givenCommand == "right":
                print("go right")

            givenCommand = "left"

            if givenCommand == "left":
                print("go left")

5.2 Use the else keyword

5.3 Use the elif keyword

5.4 Practices if, elif, else with your input

Try and give many input with below code:

givenCommand4 = input("Which direction you want to go? right/left(r/l):")

while givenCommand4 != "":
    if givenCommand4 == "left":
        print("go left")
    elif givenCommand4 == "right":
        print("go right")
    elif givenCommand4 == "r":
        print("go right")
    elif givenCommand4 == "l":
        print("go left")
    else:
        print ("I don't know where to go!")
    givenCommand4 = input("Which direction you want to go? right/left(r/l):")

5.5 Python Comparison Operators

5.5.1 practices > , < , == with your input

Try and give some input number with below code:

            myNumber = 5

            yourInput = input("Give a number between 1 to 10?")
            givenNumber = int(yourInput)

            if givenNumber == myNumber:
                print( "equal")
            elif givenNumber > myNumber:
                print("greater")
            elif givenNumber < myNumber:
                print("smaller")
            else:
                print("this will not reached!")

5.5.2 Practices >= , <= with your input

            # WhatsMyGrade.py
            grade = eval(input("Enter your number grade (0-100): "))
            if grade >= 90:
                print("You got an A! :) ")
            elif grade >= 80:
                print("You got a B!")
            elif grade >= 70:
                print("You got a C.")
            elif grade >= 60:
                print("You got a D...")
            else:
                print("You got an F. :( ")

5.6 Use if else in loop

• if even number draw circle, if old number draw square

5.7 Use if else in the loop with continue

• If even number draw circle, else skip rest of code go to next loop

5.8 Use if else in the loop with break

• If even number draw circle, else skip rest of code go to next loop

5.9 Complex Conditions with Logic Operators and, or, not

• Practice Logic Operators

5.10 Challenge

• Change your script from last class by control the color by adding if condition
• Continue modify your script to draw polygons instant of circle when Even number
• Try break when loop reach 500

5.11 Practice

1. Conditional Loop

ex. Write a Python program to construct the following pattern, using a nested for loop.

* 
* * 
* * * 
* * * * 
* * * * * 
* * * * 
* * * 
* * 
*

2. Python Loop Quiz

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