8. Sorted

Studios are in-class activities to give you hands-on practice with new concepts. The first half is the Walkthrough, an instructor-led programming problem. The second half is for you to work on individually or in pairs in class.

These problems are not graded, and you are not obligated to finish them. Get as far as you can while in class, and use them as an opportunity to play with and solidify new concepts.


Write a function remove_char that takes two string arguments, string and char. The first argument should be a string and the second should be a character (i.e. a string of length one). The function should return a new string, the result of which is string with each instance of char removed.

Here’s another, slightly different solution that uses the fact that a string is a list. This one is generally a better way to loop over strings than what we did above, if you don’t need to use the index of the current character.


Since a string is just a sequence of characters, they can be sorted from least to greatest. Sorting can be hard so we’re just going to check if a string is sorted. Write a function which returns a boolean indicating if the string is sorted or not.

Here’s an example of how your function should behave. (Recall that the order operators are case-sensitive, so that "A" < "a" evaluates to True.)

is_sorted("ABC") == True
is_sorted("aBc") == False
is_sorted("dog") == False

Bonus Missions

Bonus 1

Write a function that takes a sentence with an introductory prepositional phrase and returns the number of characters (including whitespace and punctuation) remaining in the string after the comma. For example, “Before you go to bed, you need to brush your teeth.” returns 30 and “Under the warm sun, the cat slept deeply.” returns 22.

Bonus 2

Write a function that takes in a string and converts that string to pig latin. Pig latin involves moving the first letter of a word to the end, then appending “ay.” For example, the phrase “python code wins” would turn into “ythonpay odecay insway.”

For an extra challenge, handle the case where a word starts with a vowel. In this case, the word should be unmodified except for adding “ay” at the end. For example, “all open androids” would become “allay openay androidsay.”