Python Lists for Beginners
Python Lists for Beginners¶
Here are the runnable exercises for Python Lists for Beginners.
#1. Create a list of three of your favorite foods. Save it in a variable called foods.
# Your code here:
#2. From your list of favorite foods, select the second item.
#3. Using a slice, create a reversed copy of your list of favorite food
#4. my name is john".upper() returns the string “MY NAME IS JOHN”. Given that fact, create an uppercase list of your favorite foods using a for loop.
#5. Create a second uppercase list of your favorite foods, using a list comprehension.
For exercises 6-14, use the following list as your starting point. (Tip: If you run the cell below, you can use the variables in cells beneath).
letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G']
#6. Use a function to get the length of the letters list. Display it.
#7. Get the last item in the list, using a positive index.
#8. Get the last item in the list, using a negative index.
#9. Write a slice expression to return the letters D through F (inclusive)
#10. Write a slice expression that returns the following list: [‘A’, ‘D’, ‘G’]
#11. Based on what you learned in exercise 4, can you guess how to write a program to return a list of lowercase letters based on the letters list?
#12. For #11, did you iterate the list using a list comprehension or a for loop? Why?
#13. How could you return a copy of the list using a slice expression?
#14. How could you return a list that looks like the list below?
['G', 'F', 'E', 'D', 'C', 'B', 'A']
#15. The range function returns a sequence — that is to say, it can be used as you would use a list inside a for-loop or list comprehension. For example:
num_list = [x for x in range(1,6)]
print(num_list)
Output:
[1, 2, 3, 4, 5]
Based on what you know about slice syntax, what would you expect the output of the following code to be?
#16. What do you predict will be printed by the code below?
num_list = [x for x in range(1,6)]
num_list[0:2] = [99, 100]
print(num_list)
#17. Here’s a slight variation on the code from #16. What do you expect will be printed by the following code?
num_list = [x for x in range(1,6)]
other_list = num_list[:]
other_list[0:2] = [99, 100]
print(num_list)