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Intro to Programming and Data Science (Fall 2024)/Day 1 Tutorial
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====even more choices: <code>elif</code>==== If you need to execute code conditional based on more than two cases, you can use the '''<code>elif</code>''' keyword to check more cases. You can have as many <code>elif</code> cases as you want; Python will go down the code checking each <code>elif</code> until it finds a <code>True</code> condition or reaches the default <code>else</code> block. <syntaxhighlight lang="python"> sister_age = 15 brother_age = 12 if sister_age > brother_age: print("sister is older") elif sister_age == brother_age: print("sister and brother are the same age") else: print("brother is older") </syntaxhighlight> You don't have to have an <code>else</code> block, if you don't need it. That just means there isn't default code to execute when none of the <code>if</code> or <code>elif</code> conditions are <code>True</code>: <syntaxhighlight lang="python"> color = "orange" if color == "green" or color == "red": print("Christmas color!") elif color == "black" or color == "orange": print("Halloween color!") elif color == "pink": print("Valentine's Day color!") </syntaxhighlight> If color had been "purple", that code wouldn't have printed anything. '''Remember that '=' is for assignment and '==' is for comparison.'''
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