Lecture Notes on 19 Sep 2012

# Conditionals
if (cond):
  # do this

if (cond):
  # do this
else:
  # do that

if (cond1):
  # do task1
elif (cond2):
  # do task2
else:
  # do task3

# Easter Sunday problem
month = ""
if (n == 3):
  month = "March"
elif (n == 4):
  month = "April"
else:
  month = "not valid month"

verb = ""
if (y < 2012):
  verb = "was"
elif (y > 2012):
  verb = "will be"
else:
  verb = "is"

print ("In", y, "Easter Sunday", verb, "on", p, month)

# Boolean expressions

# boolean expression that evaluates to true if num is even
(num % 2 == 0)

# boolean expression that evaluates to true if num is between
# 1 and 100 inclusive
(num >= 1) and (num <= 100)

# boolean expression that evaluates to true if num is between
# 100 and 1000 and is divisible by 3
(num % 3 == 0) and (num >= 100) and (num <= 1000)

# boolean expression that evaluates to true if num is outside
# the range 1 and 10
(num < 1) or  (num > 10)