Day10

Day 10: If/Else

Instructions:

1. Open a new python file.
2. Conditional programming is no different than all of the decisions you make in life. "If I wake up on time, then I'll make breakfast." In python, conditional programming takes the form of if/elif/else, where the action is indented underneath the condition. The action is completed if the condition is true. The end of the conditional statement requires a colon (:) to mark the end of the line.

   lost = True
   if lost:
      print("We're going to need a montage.")
   

3. If the primary condition (if) is not met, the action is not completed. An else statement can be used to ensure a specific action is taken if the primary condition is not met.

   lost = False
   if lost:
      print("We're going to need a montage.")
   else:
      print("Celebrate by giving Adrian a kiss.")
   

4. Additional conditions can be added by using the elif statement. There is no limit to the number of elif statements that can be added; however, there can only be a max of one if and else statement each. Conditions are checked in sequential order and the action is completed at the first True condition. Type and execute (multiple times):

   prompt = input("What do you want to know? Type: 'steps' for number of steps at the Art Museum, 'bouts' for the major fights, or 'job' for Rocky's original job.")
   if prompt.lower() == "steps":
      print("You need to run up 72 steps to take a picture with Rocky at the Art Museum in Philadelphia.")
   elif prompt.lower() == "bouts":
      print("Rocky (1976): Apollo Creed\nRocky II (1979): Apollo Creed\nRocky III (1982): James 'Clubber' Lang\nRocky IV (1985): Ivan Drago\nRocky V (1990): Tommy Gunn\nRocky Balboa (2006): Mason Dixon")
   elif prompt.lower() == "job":
      print("Before becoming a professional boxer, Rocky was nothing but a 'bum' that collected payments for a loan shark.")
   else:
      print("{} is not an acceptable entry.".format(prompt))
   

5. As the number of conditions increases though, the code can begin to become unruly.

   num = int(input("Select a positive number between 1 and 10: "))
   if num > 10:
      print("How can you expect to be the champ if you can't follow directions?")
   elif num < 1:
      print("How can you expect to be the champ if you can't follow directions?")
   elif num < 3:
      print("Only {} sides of beef? You need to punch more if you plan to be the champ.".format(num))
   elif num < 6:
      print("{} sides of beef? That's a good number to punch if you want to be the champ.".format(num))
   elif num < 10:
      print("{} sides of beef? Punching that many is a waste. Even if you become the champ, you shouldn't be wasteful.".format(num))
   else:
      print("Well, that shouldn't have happened. {} caused an error.".format(num))
   

6. In the example above, the message for 3 would make the fourth condition true. Therefore, the program flow would end before reaching subsequent conditions.
7. Nested conditional statements are a way to efficiently segment actions based on a parent condition being met first.

   awards = input("Which would you like to see, awards won or nominated?")
   if awards.lower() == 'won':
      print("Rocky won Oscars for Best Picture, Best Director, and Best Film Editing")
   elif awards.lower() == 'nominated':
      movie = input("Which movie do you want to hear about, Rocky or Rocky III?")
      if movie.lower() == 'rocky':
         print("Rocky received Oscar nominations for Best Actor, Best Actress, two Best Supporting Actor, Best Original Screenplay, Best Original Song, and Best Sound.")
      elif movie.lower() == 'rocky iii':
         print("Rocky received Oscar an nomination for Best Original Song.")
      else:
         print("{} is not an acceptable entry.".format(awards))
   else:
      print("{} is not an acceptable entry.".format(awards))
   

8. For simple cases, it's possible to use a ternary operator to complete a conditional operation in a single line. Ternary operators use the format name = something if condition else something-else.

   reviews = 60
   rating = .93 if reviews > 50 else "Not enough reviews"
   print("On Rotten Tomatoes, Rocky has a rating: {} with a number of reviews: {}.".format(rating * 100, reviews))
   

9. Update the log file with what you have learned today.