क्लास पैटर्न

def kind(value):
    match value:
        case int():
            return 'an integer'
        case str():
            return 'a string'
        case _:
            return 'something else'

print(kind(5))
print(kind('hi'))
print(kind([1]))

from dataclasses import dataclass

@dataclass
class Point:
    x: int
    y: int

p = Point(3, 4)

match p:
    case Point(x=px, y=py):
        print('point at', px, py)

from dataclasses import dataclass

@dataclass
class Point:
    x: int
    y: int

def describe(p):
    match p:
        case Point(x=0, y=0):
            return 'origin'
        case Point(x=x, y=0):
            return 'on x-axis at ' + str(x)
        case Point():
            return 'elsewhere'

print(describe(Point(0, 0)))
print(describe(Point(5, 0)))
print(describe(Point(1, 1)))

from dataclasses import dataclass

@dataclass
class Point:
    x: int
    y: int

p = Point(3, 4)

match p:
    case Point(px, py):
        print(px, py)

class Point:
    __match_args__ = ('x', 'y')
    def __init__(self, x, y):
        self.x = x
        self.y = y

match Point(1, 2):
    case Point(a, b):
        print(a, b)

from dataclasses import dataclass

@dataclass
class Circle:
    radius: float

@dataclass
class Square:
    side: float

def area(shape):
    match shape:
        case Circle(radius=r):
            return 3.14159 * r * r
        case Square(side=s):
            return s * s

print(area(Circle(2)))
print(area(Square(3)))

from dataclasses import dataclass

@dataclass
class Point:
    x: int
    y: int

@dataclass
class Line:
    start: Point
    end: Point

line = Line(Point(0, 0), Point(3, 4))

match line:
    case Line(start=Point(x=0, y=0), end=Point(x=ex, y=ey)):
        print('from origin to', ex, ey)

def label(value):
    match value:
        case int(n):
            return 'int ' + str(n)
        case str(s):
            return 'str ' + s
        case _:
            return 'other'

print(label(7))
print(label('hi'))

from dataclasses import dataclass

@dataclass
class Point:
    x: int
    y: int
    z: int

p = Point(1, 2, 3)

match p:
    case Point(x, y, z=depth):
        print(x, y, depth)