Rob ran a class session on the use of conditional code logic by spending time describing and using the if, for, and while Python keywords, including using for in a for each context.

Example 1:
food = 'spam'

if food == 'spam':
    print('Ummmm, my favorite!')
elif food == 'tang':
    print('I prefer spam over tang!')
else:
    print("No, I won't have it. I want spam!")

Example 2:
x = 8

if 0 < x:            # assume x is an int here
    if x < 10:
        print("x is a positive single digit.")

Example 3:
for letter in 'Python':     # First Example
   print ('Current Letter :', letter)

fruits = ['banana', 'apple',  'mango']
for fruit in fruits:        # Second Example
   print ('Current fruit :', fruit)

print ("Good bye!")

Example 4:
for num in range(10,20):     #to iterate between 10 to 20
   for i in range(2,num):    #to iterate on the factors of the number
      if num%i == 0:         #to determine the first factor
         j=num/i             #to calculate the second factor
         print ('%d equals %d * %d' % (num,i,j))
         break #to move to the next number, the #first FOR
      else:                  # else part of the loop
         print (num, 'is a prime number')

Rob then ran a class exercise that revisited the Newport sea level data to deconstruct the rate of change into twenty-year time periods. Examples of two of the periods are shown below.