adds and edits exercises

exercises/Exercise 2a Local imports.md

@@ -20,7 +20,7 @@ Retrival practice in "basic" importing.
 def make_example_potion(student_name="ASPP student"):
     my_potion = potion_class.Potion(student_name=student_name)
     # Set up your old kettle and light an eternal flame underneath it.
-    my_potion.setup(container=containers.old_kettle)
+    my_potion.setup(container=containers.old_kettle, heat_source="eternal_flame")
     # Simmer for 5 hours.
     cooking.simmer(my_potion, duration=5)
     print(f"You successfully ran make_example_potion, {student_name}, well done :).")

exercises/Exercise 3 editable installation workflow.md

@@ -0,0 +1,62 @@
+## Exercise 4: Workflow
+
+#### Goal
+
+Experience that working with an editable installation does not change how you interact with your code. 
+This is supposed to be easy and fun, so run the inspection often and make mistakes with the potion.
+
+Use your git skills to commit the changes you made to a new branch, and create a pull request.
+
+
+#### Tasks
+
+- Create a new branch. 
+
+- In the `brew_potions.py` file complete the `make_python_expert_potion` function that makes the *Python expert* potion (instructions below).
+
+- In the `if _ name _ == "_ main _"` part, call the function you are editing and 
+get Professor Snoope to inspect your potion as shown for the example potion. 
+Calling `inspection_by_snoope` should never give you an error, so you will have to read what Snoope does and says to find out what went wrong.
+
+- Create a pull request.
+
+##### Brewing instructions
+
+Make a new potion called `python_expert` according to these instructions:
+
+```
+1. Set up a pewter cauldron and light a fire underneath it
+2. Add fish eyes, unicorn hair and tea leaves
+3. Let simmer for 2 hours
+4. Have snoope inspect the potion (use target_potion='python_expert').
+```
+
+Use the `if __name__ =="__main__"` block in `brew_potions.py` to create the `python_expert` potion and call Snoope to inspect the potion by calling `inspection_by_snoope` . 
+Make sure you actually call the function you are editing and change the **target** potion for Snoope to `"python_expert"`.
+
+-------------
+#### Hints
+
+1. If you don't understand the instructions, please lift your hand and we will come to explain. 
+
+2. The python expert potion is very similar to the example potion. You may copy that code and 
+adapt it accordingly.
+
+3. Note that if you copy from the `example_potion()` function, it is missing a crucial step. 
+You can look at the `Potion()` class in `brewing/potion_class.by` for inspiration 
+(it has to do with the ingredients).
+
+4. Don't forget to change the name of the potion you want Snoope to check to "python_expert" 
+when you call the inspection (in if _ name _ == "_ main _" part).
+
+
+-------------
+#### Extra credit
+
+If you look into the code you will see that there is a cooking method that is defined in the code which we have not used. 
+What happens if you do use it (try both options!) and let Snoope inspect your potion?
+
+Once you are done, reflect on what you did to find out what the cooking method was 
+- Where did you look, why did you look there first?
+- How did you figure out what it does? What part of the function did you read first?
+- Did it work on your first try? If not, how did you try to fix it - trial and error or read documentation?

exercises/Exercise 5a Virtual Environments.md

@@ -0,0 +1,42 @@
+## Exercise 5a: Virtual Environments
+
+#### Goal
+
+Create a virtual environment + install a package + see that that package was installed only in environment
+
+#### Tasks
+
+We will use `venv` as our environment manager - while commands might differ, the principles apply to all other package managers as well.
+
+1. Check which Python you are currently using, and which packages are installed. Also check which folders are in the folder you are installing the environment into.
+3. Create and activate a new environment.
+4. Check again which Python you are using and which packages are installed - are they different?
+5. Install a specific version of a package using pip e.g. pandas=1.5.3
+6. See that dependencies are also installed (more packages than only pandas appear)
+7. Deactivate and delete the environment
+8. Check the packages that are installed when no environment is active again (as step 1). Have they changed?
+
+
+#### Commands in case you get stuck (not in correct order):
+
+```bash
+% investigate Python and packages
+> which python
+> pip freeze
+> pip install <package-name>
+> pip install <package-name>==0.0.1
+
+% create an environment option 1 (create folder called venv_folder for files related to virtual environment, feel free to change the name)
+> cd <path-to-project_folder>
+> mkdir venv_folder
+> python3 -m venv venv_folder
+> source venv_folder/bin/activate
+
+% create an environment option 2
+> python3 -m venv <path-to-folder-for-venv>
+> source <path-to-folder-for-venv>/bin/activate
+
+% deactivate and delete a venv environment
+> deactivate
+> rm -rf venv_folder
+```

exercises/exercises2023/Exercise 4 Workflow.md

@@ -1,30 +0,0 @@
-## Exercise 4: Workflow
-
-#### Goal
-
-Mimic the *write feature* ⇄ *test feature* workflow.
-
-#### Tasks
-
-In the `brew_potions.py` file complete the `make_python_expert_potion` function that makes the *Python expert* potion (instructions below).
-
-Get Professor Snape to inspect your potion as shown for the example potion. Calling `inspection_by_snape` should never give you an error, so you will have to read what Snape does and says to find out what went wrong.
-
-This is supposed to be easy and fun, so run the inspection often and make mistakes with the potion.
-
-Use your git skills to commit the changes you made to a new branch, and create a pull request on Github.
-
-##### Brewing instructions
-
-Make a new potion called `python_expert` according to these instructions:
-
-```
-1. Set up a pewter cauldron and light a fire underneath it
-2. Add fish eyes, unicorn hair and tea leaves
-3. Let simmer for 2 hours
-4. Have Snape inspect the potion (use target_potion='python_expert').
-```
-
-Use the `if __name__ =="__main__"` block in `brew_potions.py` to create the `python_expert` potion and call Snape to inspect the potion by calling `inspection_by_snape` . Make sure you actaully call the function you are editing and change the **target** potion for Snape to `"python_expert"`.
-
-Note that if you copy from the `example_potion()` function, it is missing a crucial step. You can look at the `Potion()` class in `brewing/potion_class.by` for inspiration.