Variables & Data Types

        
          # Variable assignment (no declaration needed)
name = "John"
age = 25
pi = 3.14159

# Multiple assignment
x, y, z = 1, 2, 3

# Data types
string_var = "Hello World"
int_var = 42
float_var = 3.14
bool_var = True
complex_var = 3 + 4j
list_var = [1, 2, 3]
tuple_var = (1, 2, 3)
dict_var = {"key": "value"}
set_var = {1, 2, 3}
none_var = None

# Type hints (Python 3.5+)
from typing import List, Dict, Optional

def greet(name: str) -> str:
    return f"Hello, {name}!"

ages: List[int] = [25, 30, 35]
person: Dict[str, str] = {"name": "John", "city": "NYC"}
optional_name: Optional[str] = None