Exercises

Checkpoint 9.12.1.

Write a program that will print out the length of each item in the list as well as the first and last characters of the item.

weather = ["sunny", "cloudy", "partially sunny",
           "rainy", "storming", "windy", "foggy",
           "snowy", "hailing"]
---
for condition in weather:
---
    print("The word is", len(condition), "characters")
---
    first_char = condition[0]
    last_char = condition[-1]
---
    print("The first character is: " + first_char)
    print("The last character is: " + last_char)

Checkpoint 9.12.2.

Write code to determine how many ’t’s are in the following sentences.

phrases = ["My, what a lovely day today is!",
"Have you mastered cooking yet? A tasty treat could be in your future.",
"Have you ever seen the leaves change color?"]
---
for sentence in phrases:
---
    print(sentence.count("t"))

Checkpoint 9.12.3.

Although Python provides us with many list methods, it is good practice and very instructive to think about how they are implemented. Implement a Python function that works like the following:

count
in
reverse
index
insert

Checkpoint 9.12.4.

Write a Python function that will take a list of 100 random integers between 0 and 1000 and return the maximum value. (Note: there is a builtin function named max but pretend you cannot use it.)

Checkpoint 9.12.5.

Write a function sum_of_squares(xs) that computes the sum of the squares of the numbers in the list xs. For example, sum_of_squares([2, 3, 4]) should return 4+9+16 which is 29:

Checkpoint 9.12.6.

Create a list of 100 random integers between 0 and 1000, and write code for the function called countOdd(lst) to count every odd number in the list

Checkpoint 9.12.7.

Create a list of 100 random integers between -1000 and 1000, and write code for the function called sumEven(lst) to sum up all the even numbers in the list

Checkpoint 9.12.8.

Create a list of 100 random integers between -1000 and 1000, and write code for the function called sumNegatives(lst) to sum up all the negative numbers in the list

COMP 1000: Think Like a Computer: The PreTeXt Interactive Edition

Section 9.12 Exercises