Description
- Open a browser and log into Brightspace
- On the left hand side under Labs tab, find lab6 material contained in lab7-students.pdf file
- Download that file to the
Before starting, always make sure you are running Python 3
This slide is applicable to all labs, exercises, assignments … etc
ALWAYS MAKE SURE FIRST that you are running Python 3.4
(3.5/3.5 is fine too)
That is, when you click on IDLE (or start python any other way) look at the first line that the Python shell displays. It should say Python 3.4 or 3.5 or 3.6 (and then some extra digits)
If you do not know how to do this, read the material provided with Lab 1. It explains it step by step
Task (to be completed at home)
I strongly encourage you to complete these two quizes at home. Leave the time in the lab for questions to TAs about quiz problems whose solution you do not understand.
Go to coursera webpage and log in.
1.Go to the following link to and complete the Quiz of Week 4. You will find the quiz at the bottom of the page https://www.coursera.org/learn/learn-to-program/home/week/4
2.Go to the following link to and complete the Quiz of Week 5. You will find the quiz at the bottom of the page https://www.coursera.org/learn/learn-to-program/home/week/5
In Week 5 quiz you do not need to answer last couple of questions about “files” as we did not cover that (yet).
- You can do each quiz more than once.
Programming Exercises (the most important lab)
The following exercises are easily the most important exercises in this whole semester. Solving these problems (by yourself preferably) should greatly increase your understanding of computational problem solving and programming.
Do as many as possible (preferably all) of the following 13 programming exercises from your 3rd recommended textbook by Perkovic. 11 of 13 are mandatory for this lab (your choice which 11) — see the slides to come.
Introduction to Computing Using Python: An Application Development Focus, 2nd Edition, Ljubomir Perkovic
Sometimes the author uses a word “outputs”. By that he means “prints” First recall from the next 4 slides, list (and few string) functions and methods that you will need.
Introduction to Computing Using Python by Lj. Perkovic
List operators and functions >>> lst = [1, 2, 3]
>>> lstB = [0, 4] >>> 4 in lst Like strings, lists can be manipulated with False
operators and functions >>> 4True not in lst
>>> lst + lstB
[1, 2, 3, 0, 4]
>>> 2*lst
| Usage | Explanation |
| x in lst | x is an item of lst |
| x not in lst | x is not an item of lst |
| lst + lstB | Concatenation of lst and lstB |
| lst*n, n*lst | Concatenation of n copies of lst |
| lst[i] | Item at index i of lst |
| len(lst) | Number of items in lst |
| min(lst) | Minimum item in lst |
| max(lst) | Maximum item in lst |
| sum(lst) | Sum of items in lst |
[1, 2, 3, 1, 2, 3]
>>> lst[0]
1
>>> lst[1]
2
>>> lst[-1]
3
>>> len(lst)
3
>>> min(lst)
1
>>> max(lst)
3
>>> sum(lst)
6
>>> help(list …
Introduction to Computing Using Python by Lj. Perkovic
Lists methods
| Usage | Explanation |
| lst.append(item) | adds item to the end of lst |
| lst.count(item) | returns the number of times item occurs in lst |
| lst.index(item) | Returns index of (first occurrence of)
item in lst |
| lst.pop() | Removes and returns the last item in lst |
| lst.remove(item) | Removes (the first occurrence of) item from lst |
| lst.reverse(item) | Reverses the order of items in lst |
| lst.sort(item) | Sorts the items of lst in increasing order |
>>> lst = [1, 2, 3]
>>> lst.append(7)
>>> lst.append(3)
>>> lst
[1, 2, 3, 7, 3]
>>> lst.count(3)
2
>>> lst.remove(2)
>>> lst
[1, 3, 7, 3]
>>> lst.reverse()
>>> lst
[3, 7, 3, 1]
>>> lst.index(3)
0
>>> lst.sort()
>>> lst
[1, 3, 3, 7]
>>> lst.remove(3)
Methods append(), remove(), reverse(), >>>[1, 3, lst7] and sort() do not return any value; they, along >>> lst.pop()
with method pop(), modify list lst 7>>> lst
[1, 3]
Introduction to Computing Using Python by Lj Perkovic
| Usage | Explanation |
| in s | is a substring of s |
| not in s | is not a substring of s |
| s + t | Concatenation of s and t |
| s * n, n * s | Concatenation of n copies of s |
| s[i] | Character at index i of s |
| len(s) | (function) Length of string s |
String operators
To view all operators, use the help() tool
>> help(str)
Help on class str in module builtins:
class str(object)
| str(string[, encoding[, errors]]) -> str …
Introduction to Computing Using Python by Lj. Perkovic
String methods
| Usage | Explanation |
| s.capitalize() | returns a copy of s with first character capitalized |
| s.count(target) | returns the number of occurences of target in s |
| s.find(target) | returns the index of the first occurrence of target in s |
| s.lower() | returns lowercase copy of s |
| s.replace(old, new) | returns copy of s with every occurrence of old replaced with new |
| s.split(sep) | returns list of substrings of s, delimited by sep |
| s.strip() | returns copy of s without leading and trailing whitespace |
| s.upper() | returns lowercase copy of s |
Strings are immutable; none of the string methods modify string
link
