Syntax

About IF

If statements allow you to change the flow of your program. It allows you to test a condition, test what the user has entered or evaluate the current state of your variables. Fundamentally an if statement will allow you to run specific code if a condition is true or not. The condition must evaluate to either true or false. There are no other possible choices.

Here is the sample code from the video. Try this out before moving on.

age = int(raw_input("how old are you?"))
if age > 18:
	print "your an adult"
	print "hai"
else:
	print "your not an adult"

Key term

Control statements – Changes the flow of the program. Also known as flow control.

Helpful links

http://www.ibiblio.org/g2swap/byteofpython/read/if-statement.html

http://www.pwnict.co.uk/webpages/python/syntax/lesson%205/lesson5.html

http://www.pwnict.co.uk/webpages/python/problemSolve/lesson%204/Lesson4.html – NOTE this link shows you how you can decide on what conditions a IF statement should have.

http://www.tutorialspoint.com/python/python_if_else.htm

Test your skill

1. What will be printed by the following code?

a = 21
b = 21
if a>b:
   print "hi"
else:
   print "bye"

sal = int(raw_input("How much do you want? - "))
if sal>=50000:
   print "OK, I will pay you", sal
else:
   print "Your insane! I will not pay you",sal

3. Try the HackIT task – Print or not to print

outOfPaper = False
outOfToner = False
jobsPending = True
if outOfPaper == False:
    print ??????