• If statements with “FizzBuzz” 
    # 1, 2, Fizz, 4, Buzz, Fizz, 7, 8, Fizz, Buzz, 11, Fizz, 13, FizzBuzz, 16
  • Classic problem in programming, iterate through the numbers from 1 ~ 100.
    • If the number is divisible by 3, print Fizz.
    • If the number is divisible by 5, print Buzz.
    • If the number is divisible by 15, print FizzBuzz.
      • Otherwise just print the number.
  • To write the above in Python, we do: 
    for n in range(1, 101):
      if n % 15 == 0:
          print('FizzBuzz')
      else:
          if n % 3 == 0:
                 print('Fizz')
               else:
               			if n % 5 == 0:
                                      print('Buzz')
                          else:
                               print(n)
  • This would output something like: 
    1
2
Fizz
4
Buzz
Fizz
7
8
  • It does work, but we can improve it with an elif statement: 
    for n in range(1, 101):
      if n % 15 == 0:
          print('FizzBuzz')
   elif n % 3 == 0:
            print('Fizz')
   elif n % 5 == 0:
              print('Buzz')
   else:
            print(n)
  • The above outputs the same results, but is much cleaner.
    • elif must always be preceded by an if statement.
    • The else statement at the end is optional.
  • Good rule of thumb for if statements is the following:
    • if
    • elif
    • else
      • Provides some sort of default value if none of the above matches.
  • You can also add another if statement as well if you wish: 
    for n in range(1, 101):
      if n % 15 == 0:
          print('FizzBuzz')
   elif n % 3 == 0:
            print('Fizz')
   elif n % 5 == 0:
              print('Buzz')
   else:
            print(n)
		
      if n % 2 == 0:
          print('It is even!')
  • if n % 2 == 0:
  • The problem with the above, is that they can drag on and go for too many lines. There is also a one liner statement as well (Single Line if statements): 
    n = 3
print('Fizz' if n % 3 == 0 else n)
  • The output of this will be 5.
  • Can then take and set the variable to equal the above output with: 
    fizzBuzz = 'Fizz' if n % 3 == 0 else n
  • The above in programming is what is known as a ternary operator.
    • A ternary operator takes in a boolean condition, which in this case is n % 3 == 0, evaluates it and returns one value if the condition is true 'Fizz' and another value if the condition is false: else n
      • These are used to run clean code.
      • Be careful of using these improperly. 
        'Fizz' if n % 3 == 0 else 'Buzz' if n % 5 == 0 else n
  • This will output the following: 
    'Buzz'
  • More stringing is possible with: 
    'FizzBuzz' if n % 3 == 0 else 'Fizz' if n % 5 == 0 else 'Buzz' if n % 5 == 0 else n
  • Can also put these in a list like so: 
    []'FizzBuzz' if n % 3 == 0 else 'Fizz' if n % 5 == 0 else 'Buzz' if n % 5 == 0 else n for n in range (1, 101)]

Updated: