diff --git a/python-import/README.md b/python-import/README.md
index 03ae246408..406141eadb 100644
--- a/python-import/README.md
+++ b/python-import/README.md
@@ -2,3 +2,16 @@
 
 This folder contains code and materials used in Real Python's [Python `import`: Advanced Techniques and Tips](https://realpython.com/python-import/) article.
 
+The code was tested with Python 3.15.1 and 3.14.9. Install the third-party dependencies with:
+
+```console
+$ python -m pip install PyYAML==6.0.3 matplotlib==3.11.2 colorama==0.4.6
+```
+
+The examples need Python 3.9 or later, since they use `importlib.resources.files()`.
+
+Some examples need a bit of setup before you run them:
+
+- **`namespace_package/`:** Start Python inside this folder and run `sys.path.extend(["third_party", "local"])` first, as the tutorial shows.
+- **`population_quiz/`:** Download the UN data file described in `population_quiz/data/README.md`. Then run `python population_quiz.py` or `python -c "import population"` from inside `population_quiz/`, so that Python finds the `data` package.
+- **`structure/`:** Run `python cli.py structure` from inside `structure/`, or install the project with `python -m pip install -e .` from that folder.
diff --git a/python-import/hello_gui/__main__.py b/python-import/hello_gui/__main__.py
index 9f896676a5..bc1ba8e009 100644
--- a/python-import/hello_gui/__main__.py
+++ b/python-import/hello_gui/__main__.py
@@ -1,26 +1,23 @@
 # hello_gui/__main__.py
 
 import tkinter as tk
+from importlib import resources
 from tkinter import ttk
 
-try:
-    from importlib import resources
-except ImportError:
-    import importlib_resources as resources
-
 
 class Hello(tk.Tk):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.wm_title("Hello")
+        images = resources.files("hello_gui.gui_resources")
 
         # Read image, store a reference to it, and set it as an icon
-        with resources.path("hello_gui.gui_resources", "logo.png") as path:
+        with resources.as_file(images / "logo.png") as path:
             self._icon = tk.PhotoImage(file=path)
         self.iconphoto(True, self._icon)
 
         # Read image, create a button, and store a reference to the image
-        with resources.path("hello_gui.gui_resources", "hand.png") as path:
+        with resources.as_file(images / "hand.png") as path:
             hand = tk.PhotoImage(file=path)
         button = ttk.Button(
             self,
diff --git a/python-import/plugins.py b/python-import/plugins.py
index 72cb3376b9..7e3d18b073 100644
--- a/python-import/plugins.py
+++ b/python-import/plugins.py
@@ -45,7 +45,7 @@ def _import(package, plugin):
 
 def _import_all(package):
     """Import all plugins in a package"""
-    files = resources.contents(package)
+    files = [path.name for path in resources.files(package).iterdir()]
     plugins = [f[:-3] for f in files if f.endswith(".py") and f[0] != "_"]
     for plugin in plugins:
         _import(package, plugin)
diff --git a/python-import/population_quiz/data/README.md b/python-import/population_quiz/data/README.md
index 6e1d3567d9..f08dcd6975 100644
--- a/python-import/population_quiz/data/README.md
+++ b/python-import/population_quiz/data/README.md
@@ -1,3 +1,3 @@
 # Population Data
 
-You should download [`WPP2019_TotalPopulationBySex.csv`](https://population.un.org/wpp/Download/Files/1_Indicators%20(Standard)/CSV_FILES/WPP2019_TotalPopulationBySex.csv) from [the UN web page](https://population.un.org/wpp/Download/Standard/CSV/). Save the CSV file in this folder.
\ No newline at end of file
+Download [`WPP2024_TotalPopulationBySex.csv.gz`](https://population.un.org/wpp/assets/Excel%20Files/1_Indicator%20(Standard)/CSV_FILES/WPP2024_TotalPopulationBySex.csv.gz) from the UN's [World Population Prospects 2024](https://population.un.org/wpp/). Unzip it and save `WPP2024_TotalPopulationBySex.csv` in this folder.
diff --git a/python-import/population.py b/python-import/population_quiz/population.py
similarity index 65%
rename from python-import/population.py
rename to python-import/population_quiz/population.py
index e73a8cd667..95ef6ee248 100644
--- a/python-import/population.py
+++ b/python-import/population_quiz/population.py
@@ -8,21 +8,13 @@
 
 class _Population:
     def __init__(self):
-        """Prepare to read the population file"""
-        self._data = {}
+        """Read the population file"""
+        self.data = {}
         self.variant = "Medium"
 
-    @property
-    def data(self):
-        """Read data from disk"""
-        if self._data:  # Data has already been read, return it directly
-            return self._data
-
-        # Read data and store it in self._data
         print(f"Reading population data for {self.variant} scenario")
-        with resources.open_text(
-            "data", "WPP2019_TotalPopulationBySex.csv"
-        ) as fid:
+        csv_file = resources.files("data") / "WPP2024_TotalPopulationBySex.csv"
+        with csv_file.open() as fid:
             rows = csv.DictReader(fid)
 
             # Read data, filter the correct variant
@@ -30,15 +22,14 @@ def data(self):
                 if int(row["LocID"]) >= 900 or row["Variant"] != self.variant:
                     continue
 
-                country = self._data.setdefault(row["Location"], {})
+                country = self.data.setdefault(row["Location"], {})
                 population = float(row["PopTotal"]) * 1000
                 country[int(row["Time"])] = round(population)
-        return self._data
 
     def get_country(self, country):
         """Get population data for one country"""
-        country = self.data[country]
-        years, population = zip(*country.items(), strict=False)
+        data = self.data[country]
+        years, population = zip(*data.items())
         return years, population
 
     def plot_country(self, country):
@@ -52,5 +43,5 @@ def order_countries(self, year):
         return sorted(countries, key=lambda c: countries[c], reverse=True)
 
 
-# Instantiate the singleton
+# Instantiate the Singleton
 data = _Population()
diff --git a/python-import/population_quiz/population_quiz.py b/python-import/population_quiz/population_quiz.py
index ddea1252a1..61822ae8cf 100644
--- a/python-import/population_quiz/population_quiz.py
+++ b/python-import/population_quiz/population_quiz.py
@@ -2,11 +2,7 @@
 
 import csv
 import random
-
-try:
-    from importlib import resources
-except ImportError:
-    import importlib_resources as resources
+from importlib import resources
 
 
 def read_population_file(year, variant="Medium"):
@@ -14,9 +10,8 @@ def read_population_file(year, variant="Medium"):
     population = {}
 
     print(f"Reading population data for {year}, {variant} scenario")
-    with resources.open_text(
-        "data", "WPP2019_TotalPopulationBySex.csv"
-    ) as fid:
+    csv_file = resources.files("data") / "WPP2024_TotalPopulationBySex.csv"
+    with csv_file.open() as fid:
         rows = csv.DictReader(fid)
 
         # Read data, filter the correct year
@@ -37,7 +32,7 @@ def run_quiz(population, num_questions, num_countries):
     num_correct = 0
     for q_num in range(num_questions):
         print(f"\n\nQuestion {q_num + 1}:")
-        countries = random.sample(population.keys(), num_countries)
+        countries = random.sample(list(population), num_countries)
         print("\n".join(f"{i}. {a}" for i, a in enumerate(countries, start=1)))
 
         # Get user input
@@ -67,7 +62,7 @@ def run_quiz(population, num_questions, num_countries):
 
 def main():
     """Read population data and run quiz"""
-    population = read_population_file("2020")
+    population = read_population_file("2024")
     num_correct = run_quiz(population, num_questions=10, num_countries=3)
     print(f"\nYou answered {num_correct} questions correctly")
 
diff --git a/python-import/structure/pyproject.toml b/python-import/structure/pyproject.toml
new file mode 100644
index 0000000000..94d14f7427
--- /dev/null
+++ b/python-import/structure/pyproject.toml
@@ -0,0 +1,10 @@
+[build-system]
+requires = ["setuptools>=61"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "local_structure"
+version = "0.1.0"
+
+[tool.setuptools]
+packages = ["structure"]
diff --git a/python-import/structure/setup.cfg b/python-import/structure/setup.cfg
deleted file mode 100644
index 25cc2230fa..0000000000
--- a/python-import/structure/setup.cfg
+++ /dev/null
@@ -1,6 +0,0 @@
-[metadata]
-name = local_structure
-version = 0.1.0
-
-[options]
-packages = structure
diff --git a/python-import/structure/setup.py b/python-import/structure/setup.py
deleted file mode 100644
index 1fa1856aff..0000000000
--- a/python-import/structure/setup.py
+++ /dev/null
@@ -1,5 +0,0 @@
-# setup.py
-
-import setuptools
-
-setuptools.setup()