# Today we will learn about if-elif-else clauses and getting input.
# The programming language we've been using all along is Python 3, by the way
# Here's the code:
favorite_number = int(input("What's your favorite number? "))
if favorite_number > 900:
print("Woah, you like big numbers.")
elif favorite_number == 0:
print("Zero. The number of emptiness.")
elif favorite_number > 0 and favorite_number < 10:
print("You like digits, eh?")
elif favorite_number == 42:
print("The meaning of life!")
else:
print("You have bad taste.")
# and now with explanations:
# Here I added some extra newlines to give us more space to write comments
# Don't worry, blank lines don't do anything in this case.
favorite_number = int( # This converts the input to an integer*
input("What's your favorite number? ") # this gets text input from the user on the console
)
if favorite_number > 900: # In this case, the operator is ">".
print("Woah, you like big numbers.") # As expected, this code executes if the input is greater than 900.
elif favorite_number == 0: # elif is a short form of "else if". Executes if the if condition (and previous elif conditions)
# are all false and the current condition is true
# We use "==" instead of "=" for comparsion. This is less ambiguous and also tradition.
print("Zero. The number of emptiness.")
elif favorite_number > 0 and favorite_number < 10: # and is an operator that evaluates to True if both inputs are True, otherwise False
print("You like digits, eh?")
elif favorite_number == 42: # anot
print("The meaning of life!")
else: # else executes if all if and elif statements evaluate to False.
print("You have bad taste.") # this is just a silly insult
# *and if it isn't an integer, like the user enters "dogs", it'll throw an Exception (an error to you guys!)
# Exceptions can be handled to let the code move on, say ask the user again. But that's for another chapter!
# In this case, it'll throw "ValueError: invalid literal for int() with base 10: 'dog'"
# and by the way, us programmers are very fun and casual. If you asked any other average programmer for some
# sample code they'd fill it with jokes and puns too! For example, a easter egg hidden in the android platform:
# http://stackoverflow.com/questions/13375357/proper-use-cases-for-android-usermanager-isuseragoat