P ython p rogramming e xercises

Exercise #23: 99 Bottles of Beer 
# Loop from 99 to 2, displaying the lyrics to each stanza. 
for numberOfBottles in range(99, 1, -1): 
print(numberOfBottles, 'bottles of beer on the wall,') 
print(numberOfBottles, 'bottles of beer,') 
print('Take one down,') 
print('Pass it around,') 
# If there is only one, print "bottle" instead of "bottles". 
if (numberOfBottles - 1) == 1: 
print('1 bottle of beer on the wall,') 
else: 
print(numberOfBottles - 1, ' bottles of beer on the wall,') 
# The last stanza has singular "bottle" and a different final line: 
print('1 bottle of beer on the wall,') 
print('1 bottle of beer,') 
print('Take one down,') 
print('Pass it around,') 
print('No more bottles of beer on the wall!') 
Exercise #24: Every 15 Minutes 
# Loop over am and pm: 
for meridiem in ['am', 'pm']: 
# Loop over every hour: 
for hour in ['12', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11']: 
# Loop over every 15 minutes: 
for minutes in ['00', '15', '30', '45']: 
# Print the time: 
print(hour + ':' + minutes + ' ' + meridiem) 
Exercise #25: Multiplication Table 
# Print the heading of each column: 
print(' | 1 2 3 4 5 6 7 8 9 10') 
print('--+------------------------------') 
# Loop over all numbers from 1 to 10: 

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Python Programming Exercises, Gently Explained 
144 
for column in range(1, 11): 
# Print the number label on the right side: 
print(str(column).rjust(2) + '|', end='') 
# Loop over all numbers from 1 to 10: 
for row in range(1, 11): 
# Print the product, padded to two digits, followed by a space: 
print(str(column * row).rjust(2) + ' ', end='') 
# After the loop, print a newline to end the row: 
print()