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Just like in real life, sometimes we’d like our code to be able to make decisions. The Python programs we’ve written so far have had one-track minds: they can add two numbers or […] something,…
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Let’s start with the simplest aspect of control flow: comparators. There are six: Equal to ( […] ) […] Not equal to ( […] ) […] Less than ( […] ) […] **Less…
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Excellent! It looks like you’re comfortable with basic expressions and comparators. But what about extreme expressions and comparators?
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Comparisons result in either True or False, which are booleans as we learned before in this exercise . […] Let’s switch it up: we’ll give the boolean, and you’ll write the expression, just l…
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Boolean operators compare statements and result in boolean values. There are three boolean operators: 1. […] , which checks if both the statements are […] ; 2. […] , which checks if a…
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The boolean operator […] returns […] when the expressions on both sides of […] are true. For instance: […] is […] . […] is […] .
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The boolean operator […] returns […] when at least one expression on either side of […] is true. For example: […] is […] ; […] is […] .
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The boolean operator […] returns […] for false statements and […] for true statements. For example: * […] will evaluate to […] , while […] will return […] .
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Boolean operators aren’t just evaluated from left to right. Just like with arithmetic operators, there’s an order of operations for boolean operators: 1. […] is evaluated first; 2. […] is …
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Great work! We’re almost done with boolean operators. […]
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[…] is a conditional statement that executes some specified code after checking if its expression is […] . Here’s an example of […] statement syntax: […] In this example, […] …
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Let’s get some practice with […] statements. Remember, the syntax looks like this: […] Looking at the example above, in the event that […] returns […] , then the indented block of …
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The […] statement complements the […] statement. An […] / […] pair says: “If this expression is true, run this indented code block; otherwise, run this code after the else statement.”…
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[…] is short for “else if.” It means exactly what it sounds like: “otherwise, if the following expression is true, do this!” […] In the example above, the […] statement is only checke…
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Really great work! Here’s what you’ve learned in this unit: Comparators […] Boolean operators […] Conditional statements […] Let’s get to the grand finale.
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Now let’s take what we’ve learned so far and write a Pig Latin translator. Pig Latin is a language game, where you move the first letter of the word to the end and add “ay.” So “Python” becomes “y…
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Let’s warm up by printing a welcome message for our translator users.
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Next, we need to ask the user for input. […] In the above example, […] accepts a string, prints it, and then waits for the user to type something and press Enter (or Return). In the inte…
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Next we need to ensure that the user actually typed something. […] We can check that the user’s string actually has characters!
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Now we know we have a non-empty string. Let’s be even more thorough and check that our string only contains letters. Consider the following code: […] In the first line, we create a strin…
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When you finish one part of your program, it’s important to test it multiple times, using a variety of inputs.
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Now we can get ready to start translating to Pig Latin! Let’s review the rules for translation: You move the first letter of the word to the end and then append the suffix ‘ay’. Example: pytho…
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Let’s simplify things by making the letters in our word lowercase. […] The […] function does not modify the string itself, it simply returns a lowercase-version. In the example above, we …
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Now that we have the first letter stored, we need to add both the letter and the string stored in […] to the end of the original string. Remember how to concatenate (i.e. add) strings together…
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Well done! However, now we have the first letter showing up both at the beginning and near the end. […] 1. First we create a variable […] and give it the string […] 2. Next we access …
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Yay! You should have a fully functioning Pig Latin translator. Test your code thorougly to be sure everything is working smoothly. You’ll also want to take out any […] statements you were usin…
What you'll create
Portfolio projects that showcase your new skills
How you'll master it
Stress-test your knowledge with quizzes that help commit syntax to memory