CSCI 131: Introduction to Programming with Python
CSCI 131: Introduction to Programming with Python
IF and IF – ELSE statements
if expression:
action
If expression is true the action will be executed, otherwise the program will skip the action and execute the first statement after if
Examples:
a. count = 3
if count = = 3:
print “hello”
print “ yana”
b. count = 3
if count > 5:
print “hello”
print “yana”
c. name = “yana”
if name = = “guy”:
print “ hello”
print “guy”
d. name = “yana”
if name = = “yana”:
print “hello”
print “ guy”
IF – ELSE statement
if expression:
Action 1
else:
Action 2
If expression is true Action1 will be executed, if expression is false Action2 will be executed.
Examples:
1. count = 5
if count % 2 = = 0 :
print “ the number is even “
else:
print “the number is odd “
2. operator means not equal , the same as !=
name = “yana”
if name < > “yana”:
print “ the name is not yana “
else:
print “ the name is yana”
Practice:
1. Write a program sign.py that will read one number and determines if the input number is positive or not. The program will prints an appropriate message.
2. Write a program Lilo.py that will read one name and will check if the name is equal to “LILO”. The program will print an appropriate message.
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