adds 2025 materials

exercises/Exercise 1a Local imports.md

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+## Exercise 1a: Local importing
+
+#### Goal
+
+Retrival practice in "basic" importing.
+
+#### Preparation
+
+(none)
+
+#### Tasks
+
+We are simulating having code in one folder and calling the code from the folder above. 
+
+0. Create a file in the `src/` folder called `daily_menu.py` and copy the code below
+   into it.
+
+```python
+def todays_special():
+    pizza_margherita = make_margherita_pizza()
+
+    schorle = make_apfelschorle()
+
+    print("Today's special is ready! Buon Appetito!")
+    return pizza_margherita, schorle
+
+pizza, drink = todays_special()
+```
+
+1. Figure out what import statements are missing, either by visual inspection or
+   by running the code and seeing what does. Add the missing import statements at
+   the top of the file. You may need to inspect the files in `src/italianfood/`.
+
+2. Run `daily_menu.py`. Did it work?

exercises/Exercise 1b Unprotected code.md

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+## Exercise 1b: Unprotected code
+
+#### Goal
+
+Investigate what happens when importing from modules with "unprotected" code.
+
+#### Preparation
+
+(none)
+
+#### Tasks
+
+0. Create a file in the `src/` folder called `unprotectd_code.py`.
+
+1. Add a line in `unprotectd_code.py` that imports the `todays_special` function from `daily_menu.py`.
+
+2. **BEFORE YOU EXECUTE THE FILE**. Discuss with your partner what you think will happen when you run `unprotectd_code.py`.
+
+3. Run `unprotectd_code.py`. Does your prediction match reality?
+
+4. (optional, for those who know) Discuss with your partner:
+    * Why did this behaviour occur?
+    * Why is it not good?
+    * What can you do to "fix" the behaviour?

exercises/Exercise 2 editable installation workflow.md

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+## Exercise 2: Editable installation 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
+
+- In the `make_pizzas.py` file add another function that makes your favourite pizza.
+  Be creative with your toppings :).
+
+- Call this function from different places in your code
+  - in `make_pizzas.py` call your function in the if __name__ == "__main__" part
+  - add it to the tasting menu in the `scripts/run_pizza_restaurant.py` file
+  - replace the margherita pizza in the `src/daily_menu.py` file with your pizza
+
+-------------
+#### Extra credit
+
+Once you are done, reflect on what you did to find out where the function making the pizza was and how it worked
+- 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 4 PEP8.md

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+## Exercise 4: PEP8
+
+#### Goal
+
+Get you familiar with some of the fun facts hidden in the PEP8 guide.
+
+#### Preparation
+
+(none)
+
+#### Tasks
+
+0. Navigate to [PEP8](https://peps.python.org/pep-0008/).
+
+1. Depending on your assigned letter, answer the questions in the corresponding
+   set below. Feel to tackle the questions out of order. You can also split the
+   questions between your pair, but be you must leave time to discuss the answers
+   together.
+
+##### Set A
+1. What should you use instead of if y == None?
+2. If you have an acronym in camel case, should you capitalize the first letter
+   only or the whole acronym?
+3. How should you check if a variable equals False?
+4. What is important about how underscores work with variable names? What happens
+   if I put an underscore after a variable? One before? Two before?
+5. How many spaces should you use after a period in a comment?
+
+##### Set B
+1. What are the capitalization guidelines for classes, functions, and variables?
+   Give examples.
+2. How should you check if a path ends in .txt?
+3. What is the difference between mixed case, camel case, and snake case?
+4. How should you indicate block comments?
+5. What are the whitespace rules around operators? Give several examples.
+
+##### Set C
+1. If I need to import os, sys, numpy, matplotlib, and a local module called 
+   _utils.py, what does my import block look like?
+2. How many blank lines go before a function I define at the top of a module? How
+   many after?
+3. Which of these is correct: x[3:4] or x[3 : 4]?
+4. Should you use single or double quotes to indicate strings?
+5. Give examples of a long line of code and how you can break it onto multiple
+   lines.

exercises/Exercise 5 Virtual Environments.md

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+## Exercise 5: 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
+```