From 0ea404ac019ba39ffe4da921ac764c91324c2775 Mon Sep 17 00:00:00 2001
From: git-sandro <sandro-zimmermann@outlook.com>
Date: Thu, 26 Feb 2026 12:25:16 +0100
Subject: [PATCH] feat: class tutorials

---
 class/class_introduction.py | 10 ++++++++++
 class/dataclass_tutorial.py | 27 +++++++++++++++++++++++++++
 class/konto.py              | 21 +++++++++++++++++++++
 class/repr_tutorial.py      | 10 ++++++++++
 class/str_tutorial.py       | 15 +++++++++++++++
 5 files changed, 83 insertions(+)
 create mode 100644 class/class_introduction.py
 create mode 100644 class/dataclass_tutorial.py
 create mode 100644 class/konto.py
 create mode 100644 class/repr_tutorial.py
 create mode 100644 class/str_tutorial.py

diff --git a/class/class_introduction.py b/class/class_introduction.py
new file mode 100644
index 0000000..048c893
--- /dev/null
+++ b/class/class_introduction.py
@@ -0,0 +1,10 @@
+
+class Konto():
+    pass
+
+k1 = Konto()
+k2 = Konto()
+
+print(k1)
+print(k2)
+print(k1 is k2)
diff --git a/class/dataclass_tutorial.py b/class/dataclass_tutorial.py
new file mode 100644
index 0000000..c467879
--- /dev/null
+++ b/class/dataclass_tutorial.py
@@ -0,0 +1,27 @@
+from dataclasses import dataclass
+
+@dataclass
+class Student:
+    name: str
+    nr: int
+    sem: int
+
+@dataclass
+class Rechteck:
+    breite: float
+    hoehe: float
+
+    def flaeche(self) -> float:
+        return self.breite * self.hoehe
+    
+# Validierung
+@dataclass
+class Produkt:
+    name: str
+    preis: float
+
+    def __post_init__(self):
+        if not self.name:
+            raise ValueError("...")
+        if self.preis < 0:
+            raise ValueError("...")
\ No newline at end of file
diff --git a/class/konto.py b/class/konto.py
new file mode 100644
index 0000000..efb36fc
--- /dev/null
+++ b/class/konto.py
@@ -0,0 +1,21 @@
+class Konto():
+    def __init__(self, inhaber, saldo):
+        if not inhaber:
+            raise ValueError("Inhaber darf nicht leer sein")
+        if saldo < 0:
+            raise ValueError("Saldo darf nicht negativ sein")
+        self.inhaber = inhaber
+        self.saldo = saldo
+
+    def einzahlen(self, betrag):
+        self.saldo += betrag
+
+    def abheben(self, betrag):
+        self.saldo -= betrag
+
+k = Konto("Alice", 100)
+print(k.saldo)
+k.einzahlen(25)
+print(k.saldo)
+k.abheben(45)
+print(k.saldo)
\ No newline at end of file
diff --git a/class/repr_tutorial.py b/class/repr_tutorial.py
new file mode 100644
index 0000000..902944c
--- /dev/null
+++ b/class/repr_tutorial.py
@@ -0,0 +1,10 @@
+class Konto:
+    def __init__ ( self , inhaber , saldo ) :
+        self . inhaber = inhaber
+        self . saldo = saldo
+    
+    def __repr__ ( self ) :
+        return f"Konto(inhaber = {self.inhaber!r}, saldo = {self.saldo!r})"
+    
+k = Konto ( " Alice " , 100.0)
+print ( k ) # Konto ( inhaber = Alice , saldo =100.0)
\ No newline at end of file
diff --git a/class/str_tutorial.py b/class/str_tutorial.py
new file mode 100644
index 0000000..fab13a3
--- /dev/null
+++ b/class/str_tutorial.py
@@ -0,0 +1,15 @@
+class Konto:
+    def __init__ (self, inhaber, saldo):
+        self.inhaber = inhaber
+        self.saldo = saldo
+    
+    def __repr__(self):
+        return f"Konto(inhaber = {self.inhaber!r}, saldo = {self.saldo!r})"
+    
+    def __str__(self):
+        return f"Konto von {self.inhaber}: CHF {self.saldo:.2f}"
+    
+k = Konto ( " Alice " , 100.0)
+print(str(k))   # __str__
+print(repr(k))  # __repr__
+print(k)        # bevorzugt __str__ , sonst __repr__
\ No newline at end of file