Update examples.py

balapriyac · web-flow · commit 291590229331 · 2025-10-10T07:26:49.000+05:30
diff --git a/pydantic-for-python-devs/examples.py b/pydantic-for-python-devs/examples.py
@@ -1 +1,61 @@
+# ! pip install pydantic
 
+from pydantic import BaseModel
+
+class User(BaseModel):
+    name: str
+    age: int
+    email: str
+# Create a user
+user = User(name="Alice", age="25", email="alice@example.com")
+print(user.age)
+print(type(user.age))
+
+from pydantic import BaseModel, Field
+from typing import Optional
+
+class Product(BaseModel):
+    name: str
+    price: float
+    description: Optional[str] = None
+    in_stock: bool = True
+    category: str = Field(default="general", min_length=1)
+
+# All these work
+product1 = Product(name="Widget", price=9.99)
+product2 = Product(name="Gadget", price=15.50, description="Useful tool")
+
+from pydantic import BaseModel, field_validator
+import re
+
+class Account(BaseModel):
+    username: str
+    email: str
+    password: str
+
+    @field_validator('username')
+    def validate_username(cls, v):
+        if len(v) < 3:
+            raise ValueError('Username must be at least 3 characters')
+        if not v.isalnum():
+            raise ValueError('Username must be alphanumeric')
+        return v.lower()  # Normalize to lowercase
+
+    @field_validator('email')
+    def validate_email(cls, v):
+        pattern = r'^[\w\.-]+@[\w\.-]+\.\w+$'
+        if not re.match(pattern, v):
+            raise ValueError('Invalid email format')
+        return v
+
+    @field_validator('password')
+    def validate_password(cls, v):
+        if len(v) < 8:
+            raise ValueError('Password must be at least 8 characters')
+        return v
+
+account = Account(
+    username="JohnDoe123",
+    email="john@example.com",
+    password="secretpass123"
+)
