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Magic 8 Ball – Using Python Blocks!
The purpose of this post is to demonstrate how Python trinkets can be used to code with blocks.
Trinket blocks use the same approach as Scratch: A collection of blocks that the programmer can select to build their code in a more visual way.
The benefit of Trinket Blocks is that you can then view the Python code that it has generated.
A fantastic resource for those who are struggling with the syntax.
Also a great transition for those who have learned to program using Scratch and want to switch to text based programming e.g. using Python.
Look at this example that recreate the Magic 8 Ball program. Click on view code “>_” button to switch between the “Blocks code” and the Python code.
Remove The Blocks – Robotics Challenge
This is a classic robotics challenge where students have to build their own robot that will be used to tidy up a 2m by 1m mat full of lego bricks by either collecting or pushing these bricks outside the mat.
To complete this challenge we used the NXT Lego Mindstorm robot, alongside the Enchanting software to create the computer algorithm.
Here is our algorithm:
You can find out more about the Enchanting software on: http://enchanting.robotclub.ab.ca/.
What’s my grade?
Learning Objectives:
By completing this challenge you are going to further improve your skills at using:
- Selection structures (using If statements),
- Comparison operators (<, <=, >, >=, !=, ==)
- Boolean logic (AND, OR) when using comparative operators
You may want to use our Python Cheat Sheet to complete this challenge looking especially at the section called “If Statements” and the section called “Comparison Operators”.
Your Challenge
Create a user friendly program that asks a user to input their exam score out of 60 marks. The program should output the grade that they have received using the grade boundaries listed in the table below.
| Mark | Grade |
| 54+ | A* |
| 48 – 53 | A |
| 42 – 47 | B |
| 36 – 41 | C |
| 30 – 35 | D |
| 24 – 29 | E |
| 0 – 23 | U |
The program should also tell the user how many marks they are away from the next grade up.
Your Python code…
Solution...
The solution for this challenge is available to full members!Find out how to become a member:
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Victor Vasarely’s Artwork revisited using Python
In this blog post we are looking at a specific painting from Victor Vasarely. The painting is from a serie of paintings called “Alphabet Plastique” and was painted in the 70’s.
We are going to try to recreate this painting using the turtle library in Python.
Did you know?
Victor Vasarely is a unique artist in the history of twentieth century art. Famous during his lifetime, he distinguished himself from contemporary art with the creation of a new movement: optical art. The evolution of his life of work is inherently coherent, progressing from graphic art to the artist’s determination to promote a social art that is accessible to all.
Source:www.fondationvasarely.fr
First attempt
Your Challenge
Search the internet for some artwork from Vasarely’s “Alphabet Plastique” collection and use this as a source of inspiration. Using the turtle library in Python (See script above), create your own piece of artwork inspired from your research.
Pixel Art in Python
Learning Objectives
In this blog post we are going to investigate how to use lists and list of lists with Python to create some 2D pixel art graphics.
List?
In Python, a list is used to save collection of values. For instance, to save all the different days of the week we could declare a variable called “daysOfTheWeek” and assign a list as follows:
daysOfTheWeek = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
Based on this what do you think len(daysOfTheWeek) would return?
What’s about daysOfTheWeek[0]?
Or daysOfTheWeek[3] ?
Now look at this program used to display all the days of the week:
When using lists you can use a range of methods to add or remove values in the list. For instance:
Multi-dimensional Lists?
Sometimes you need more than on dimension to a list. In Python you can achieve this by creating a list of lists!
For instance for our pixel art project we want to store each pixel on a line within a list:
e.g.:
line1=[1,0,1,0,1,0] line2=[0,1,0,1,0,1] line3=[1,0,1,0,1,0]
We can then store all these lines into a list. Let’s call this list “grid”
grid=[line1, line2, line3]
A quicker way to do this is to do it all in one line as follows:
grid = [[1,0,1,0,1,0],[0,1,0,1,0,1],[1,0,1,0,1,0]]
We can then access any cell within this grid using the following command:
print grid[2][4] #This would return the value of the 5th of the 3rd line!
Let’s apply this to our pixel art project
Challenge #1:
Change this code to create the pixel art of a space invader:
Challenge #2:
Tweak this code to allow colours to be used in your pixel art.
To do so you will first create a new list called colourPalette to store a collection of colours of your choice: e.g.
colourPalette = ["#FF0000#", "#00FF00", "#0000FF", "#000000", "#FFFFFF"]
More changes will be required for you to be able to recreate this pixel art:
Traffic Lights Challenge
Did you know?
An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints.
A burglar alarm, an in-car cruise control system, a speedometer on a bike, a traffic lights control system are all examples of embedded system.
One application of computing is to create the algorithms used by these control systems. For this challenge we will focus on a traffic lights system.
Our Traffic Lights
Our system consists of two traffic lights used at a crossing.
The diagram below describes the sequence that these traffic lights have to follow:
We have started the code to control the first traffic light.
Your Challenge
Tweak this code to control the second traffic light. The second traffic light sequence should match the one described in the diagram above. However both traffic lights cannot be green at the same time!
Extension
Check this article to see how “smart” traffic lights help control the flow of traffic more effectively.
Python Shapes using Turtle
Learning Objectives
In this challenge we are going to use x and y coordinates to draw shapes on the screen. We will be using the turtle library to draw on the screen.
X and Y coordinates? Quadrant?
Check the above picture. Can you state three facts about X and Y coordinates and about quadrants?
The canvas we are drawing on (using Python Turtle) is 400 pixels wide by 400 pixels high.
Look at the canvas below to understand how (x,y) coordinates work:
Challenge #1
Look and test the following code used to draw a “+” shape.
Your task is to tweak this code to draw the following shapes:
Challenge #2
Look and test the following code used to draw a square using the for loop.
Your task is to tweak this code to draw the following shapes:
Extension
Once you have completed all the shapes above you can try this more advanced challenge.
My E-Mail Validation Script
The aim of this challenge is to write a computer program that asks the end-user to type their e-mail address. The program should decide whether the e-mail being entered is a valid one or not.
Some of the validation checks that your program should complete are as follows:
- The email should contain one and only one “@” sign
- The email should contain at least one “.” sign located after the “@” sign. However it may contains more than one “.” sign for emails ending in .co.uk for instance
- The email cannot contain any space or “#” signs
- The “@” sign cannot be in the first position and there should be at least 1 character between the “@” and the “.” sign.
- The email cannot end with a “.” sign
Can you think of any other rules to make your validation script even more robust?
Learning Objectives
By Completing this challenge you are going to develop your string manipulation skills!
Let’s Get Started
Look at the following code used to find out if the email contains an “@” sign.
Comlete this code to implement all of the validation check mentionned above.
Solution...
The solution for this challenge is available to full members!Find out how to become a member:
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Fancy a game of Poker Dice?
The aim of this challenge is to create a simplified game of Poker Dice using only three dice.
The computer will generate three random numbers between 1 and 6. The user scores points as follows:
- Three of a kind: +50pts
- Straight (e.g. 3,4,5): +30pts
- Three odd numbers: +15pts
- Three even numbers: +15pts
- One pair: +10pts
Step 1: Using random numbers
Start your game by generating three random numbers and displaying these to the end user.
You will need to import the randint function from the random python library. To do so you can use the following code:
from random import randint #to generate a random number between 1 and 10 use the following instruction: myNumber = randint(1,10)
Step 2: Odd or Even?
Think about the characteristic of an odd number aka a number which cannot be divided evenly by 2.
Using the mod (remainder: % sign in Python) we can determine if a number can be divided evenly by 2.
Based on this we can create a function (sub routine) called isOdd that will take a number as a parameter and return True if this number is odd, False if not.
Try this yourself or check the following code.
def isOdd(number):
if (number % 2 == 1):
return True
else:
return False
Can you make up another function to findout if a number is even?
Step 3: Complete the game…
You will need to reuse the two functions, isOdd() and isEven() that you created in the previous step.
Complete the code
Check the code below and complete it further:
Solution...
The solution for this challenge is available to full members!Find out how to become a member:
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