9. References & More Lists
Feel free to use your laptop if you have it
Ensure I have recorded your completion — failure to do so will result in a grade of 0
I strongly encourage you to work with others in the lab
When you get stuck, do me a favour and ask those sitting around you for help
I want people to get used to working together in the labs
Peer teaching and peer learning is super effective
Note
To obtain full marks for the lab, you must:
Have completed the pre-lab exercises
Have been working on the lab content
Demonstrate competency in the topics
9.1. Pre Lab Exercises
Warning
You must have completed the specified exercises prior to the start of the lab. If you have not come to lab prepared, you will be asked to leave and you will obtain a grade of 0 for the lab.
For all exercises
Use
assert
to test instead of theirtest
function
-
2 — note the portions of solutions within the chapter text
Write assertion tests for each of your functions above
9.2. Before Kattis
Run the following code and figure out what what it does and how it does it
I want to see everyone with paper here working through the logic
If you can’t figure it out, hack around with the code
Comment out bits
Print out values
Do whatever you need to do to figure it out
1a = [0, 0, 0] 2b = [a,a,a] 3 4for row in b: 5 toPrint = '' 6 for d in row: 7 toPrint += str(d) + ' ' 8 9 print(toPrint)
Add
b[1][1] = 1
to line 3 and run it again and see what happensIs this what you expected?
Alter the code such that the output will be what’s below.
Change the list setup/creation part, not the loops
0 0 0 0 1 0 0 0 0
Add
b[0][1] = 1
to line 3 and run it again and see what happensIs this what you expected?
Given a list of integers, return, in a list, indices of two numbers such that they add up to a specific target
You may assume that each input would have exactly one solution
You may not use the same element twice
For example, given
nums = [2, 7, 11, 15]
, target =9
Since
nums[0]
+nums[1]
=2
+7
=9
Return
[0, 1]
Think about how much work your algorithm for the previous question had to do in terms of \(n\), where \(n\) is the length of the list
Can you somehow think of a better algorithm that would do less work?
Don’t spend too much time on this if you can’t come up with a solution
Hint: Dictionaries (but leave the
nums
list alone)
9.3. Kattis Problems
You should be using a scrap piece of paper to work out the ideas for the following problems
The problems you are to solve are getting too complex to try to solve by just coding
Trying to solve problems by just typing away will not yield success
Warning
Ensure that your your completion has been recorded. Failure to do so may result in a grade of 0.