KPRIDE Python Programming Pedagogy

KPRIDE

Keywords

The code snippet below contains each of these key python programming concepts. Can you identify which line number they're on?

Being able to understand and use the right words to describe the code you're looking at helps you know what to search for and how to ask for help when you're writing your own code

Progress:

arithmetic operator: symbol or characters used to perform a mathematical process on input data

assignment: setting the value of a variable

built-in subprogram: a type of pre-existing subprogram which you can use in python without having to import any modules or defining it yourself (e.g. input / print)

case conversion: changing a string from uppercase to lowercase or the other way round

character: individual symbol, letter or digit that forms part of a string

comments: code is easier to read when each line or section of code is described in a way that helps other programmers understand what it does

indentation: code is easier to read when tabs or spaces are used to move blocks of code across to the right. This is necessary in python but optional in other programming languages

integer: a whole number

iteration: using FOR to loop through each value in a data structure (e.g. list or string)

list: data structure which can grow or shrink to store as many values as required, keeping them in order

output: using print(...) to display a message to the user

parameter: value passed into a subprogram which then behaves like a local variable for the scope of that subprogram

read: loading data from a file

selection: using if to decide what to run next based on a boolean expression

string: data structure which stores multiple characters in order

subprogram call: part of the code which causes a subprogram to actually run

variable: named memory location which can store a value which can change when the program runs

whitespace: code is easier to read when blank lines are used to break the code into logical paragraphs

Score: 0%

1/18: arithmetic operator

symbol or characters used to perform a mathematical process on input data

Type in a line number where you can see this keyword in the python code then press check, or click on a line number

Line number:

 
# Find out more about frequency analysis here: https://en.wikipedia.org/wiki/Frequency_analysis
# Pride and Prejudice by Jane Austen
# Source: https://www.gutenberg.org/files/1342/1342-0.txt
 
import re
 
# load the story from a file
with open("story.txt") as f:
  story = f.read().lower()
 
all_letters = re.findall("[a-z]", story)
 
letters = {}
for letter in all_letters:
  if letter in letters:
    letters[letter] += 1
  else:
    letters[letter] = 1
 
# sort letters alphabetically
alphabet = []
for letter in letters:
  alphabet.append(letter)
 
alphabet.sort()
 
print("Letter|Frequency")
for letter in alphabet:
    frequency = letters[letter]
    bar = "="*(frequency // 10)
    print("{:>6}|{:}".format(letter, bar))
 
# Challenges
# 1) Replace story.txt with your own story
# 2) Make all of the bars shorter
# 3) Change the table so that it shows the number as well as a bar chart   
 

Predict

What do you think this program will output? What values do you think each variable will hold?

 
# Find out more about frequency analysis here: https://en.wikipedia.org/wiki/Frequency_analysis
# Pride and Prejudice by Jane Austen
# Source: https://www.gutenberg.org/files/1342/1342-0.txt
 
import re
 
# load the story from a file
with open("story.txt") as f:
  story = f.read().lower()
 
all_letters = re.findall("[a-z]", story)
 
letters = {}
for letter in all_letters:
  if letter in letters:
    letters[letter] += 1
  else:
    letters[letter] = 1
 
# sort letters alphabetically
alphabet = []
for letter in letters:
  alphabet.append(letter)
 
alphabet.sort()
 
print("Letter|Frequency")
for letter in alphabet:
    frequency = letters[letter]
    bar = "="*(frequency // 10)
    print("{:>6}|{:}".format(letter, bar))
 
# Challenges
# 1) Replace story.txt with your own story
# 2) Make all of the bars shorter
# 3) Change the table so that it shows the number as well as a bar chart   
 

My predictions:

Write each prediction of what the program will output.

You can also predict variable values e.g. a = 10

Predict / Run

See how accurate your predictions were. Did the code behave as you expected?

Investigate

Experiment by editing the code.

Ideas:

Try the program with different input data
Run it line by line (Ctrl and full stop) to see how variables change.
Read through the comments and see if there are any challenges to complete
Change the values of some variables or constants and see how that affects the program
Is there any input data that can crash the program?
Change the logic of the program to make it do something different
Add comments explaining what you've discovered

Debug

This code has been sabotaged with some common mistakes. Can you find and fix them all?

Click on the button to add 5 more errors to the code

Extend

Use your creativity along with what you've learned to create your own python project.

You get more points for each python skill you use from the keywords section

Click on "tests" to see a description of which python skills to aim for and keep track of which ones you've already used