diff --git a/classes.py b/classes.py
new file mode 100644
index 0000000..3ebca7a
--- /dev/null
+++ b/classes.py
@@ -0,0 +1,171 @@
+# Une classe sert à stocker des attributs ensemble.
+from dataclasses import dataclass
+from statistics import mean
+
+
+@dataclass
+class Point:
+    x: float
+    y: float
+
+
+from random import randint
+
+
+class Dice:
+    def __init__(self, value=6):
+        self.value = value
+
+    def throw(self):
+        self.value = randint(1, 6)
+
+    def __repr__(self):
+        return " ⚀⚁⚂⚃⚄⚅"[self.value]
+
+
+class DiceCup:
+    def __init__(self, dices):
+        self.dices = dices
+
+    def shake(self):
+        for dice in self.dices:
+            dice.throw()
+
+    def total(self):
+        return sum([dice.value for dice in self.dices])
+
+    def mean(self):
+        return mean([dice.value for dice in self.dices])
+
+
+cup = DiceCup([Dice() for _ in range(1000)])
+results = {}
+for i in range(10000):
+    cup.shake()
+    try:
+        results[cup.total()] = results[cup.total()] + 1
+    except KeyError:
+        results[cup.total()] = 1
+
+from matplotlib import pyplot as plt
+
+plt.scatter(results.keys(), results.values())
+plt.show()
+
+
+class Point:
+    def __init__(self, x, y):  # Dunder init "Double underscore init"
+        self.x = x
+        self.y = y
+
+    def __repr__(self):
+        return f"Point(x={self.x}, y={self.y})"
+
+    def dist_from_origin(self):
+        return (self.x**2 + self.y**2) ** 0.5
+
+    def dist(self, other):
+        """Compute distance between two points."""
+        return ((self.x - other.x) ** 2 + (self.y - other.y) ** 2) ** 0.5
+
+
+origin = Point(0, 0)  # origin.x = 0, origin.y = 0
+print(origin)
+
+
+def dist_from_origin(x, y):
+    """Compute distance between a point and the origin."""
+    return (x**2 + y**2) ** 0.5
+
+
+def dist(x1, y1, x2, y2):
+    """Compute distance between two points."""
+    return ((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5
+
+
+def dist_from_origin(point):
+    """Compute distance between a point and the origin."""
+    return (point["x"] ** 2 + point["y"] ** 2) ** 0.5
+
+
+def dist(p1, p2):
+    """Compute distance between two points."""
+    return ((p1["x"] - p2["x"]) ** 2 + (p1["y"] - p2["y"]) ** 2) ** 0.5
+
+
+def dist_from_origin(point):
+    """Compute distance between a point and the origin."""
+    return (point.x**2 + point.y**2) ** 0.5
+
+
+def dist(p1, p2):
+    """Compute distance between two points."""
+    return ((p1.x - p2.x) ** 2 + (p1.y - p2.y) ** 2) ** 0.5
+
+
+import datetime as dt
+
+
+@dataclass
+class Recette:
+    nom: str
+    ingrédients: dict
+
+
+@dataclass
+class Report:
+    date: dt.datetime
+    nb_last_month: int
+    nb_current_month: int
+    total_values: float
+
+    def update(self):
+        ...
+
+    def save(self, path):
+        ...
+
+
+def load_report(path):
+    return Report(dt.date.today(), 0, 0, 0)
+
+
+def update_report(report):
+    ...
+
+
+# def compare_reports(
+#     date,
+#     nb_last_month,
+#     nb_current_month,
+#     total_values,
+#     other_date,
+#     other_nb_last_month,
+#     other_nb_current_month,
+#     other_total_values,
+# ):
+#     ...
+
+
+def compare_reports(report, other_report):
+    ...
+
+
+def save_report(path, report):
+    ...
+
+
+daily_report = load_report("daily.xls")
+monthly_report = load_report("monthly.xls")
+update_report(daily_report)
+update_report(monthly_report)
+save_report("daily.xls", daily_report)
+save_report("monthly.xls", monthly_report)
+
+
+daily_report = load_report("daily.xls")
+monthly_report = load_report("monthly.xls")
+daily_report.update()
+monthly_report.update()
+daily_report.save("daily.xls")
+monthly_report.save("monthly.xls")
diff --git a/cli-args.py b/cli-args.py
new file mode 100644
index 0000000..1a28f31
--- /dev/null
+++ b/cli-args.py
@@ -0,0 +1,12 @@
+# import argparse
+#
+# parser = argparse.ArgumentParser()
+# parser.add_argument("--version", "-v", action="store_true")
+# parser.add_argument("input_file")
+# parser.add_argument("output_file")
+#
+# args = parser.parse_args()
+
+import sys
+
+print(sys.argv)
diff --git a/functions.py b/functions.py
index 457e029..da4b8bf 100644
--- a/functions.py
+++ b/functions.py
@@ -6,6 +6,7 @@ def is_even(n):
     """
     return n % 2 == 0
 
+
 def is_odd(n):
     """Returns True if n is odd.
 
@@ -14,6 +15,7 @@ def is_odd(n):
     """
     return not is_even(n)
 
+
 for i in range(10):
     if is_even(i):
         print(f"{i} est pair")
diff --git a/list-comprehension.py b/list-comprehension.py
new file mode 100644
index 0000000..7c070d6
--- /dev/null
+++ b/list-comprehension.py
@@ -0,0 +1,14 @@
+# Liste en compréhension
+# Liste en intension (!= extension)
+
+[1, 2, 3]
+print([i for i in range(0, 100) if i % 3 == 0 or i % 5 == 0])
+
+ensemble_en_extension = {1, 2, 3}
+ensemble_en_intension = {i for i in range(0, 100) if i % 3 == 0 or i % 5 == 0}
+
+{1: 1, 2: 2, 3: 3}
+print({i: i**2 for i in range(0, 100) if i % 3 == 0 or i % 5 == 0})
+
+
+durées = [recette["durée"] for recette in recettes]