Merge pull request #681 from realpython/python-isinstance-fix-commit

python-isinstance (Fix)

Author: brendaweles

python-isinstance/README.md

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+# What Does isinstance() Do in Python?
+
+This folder provides the code examples for the Real Python tutorial [What Does isinstance() Do in Python?](https://realpython.com/what-does-isinstance-do-in-python/).
+
+The `.py` files contain the code found in the tutorial. 
+
+When setting up your tutorial environment, make sure `balls.py`, `balls_v2.py`, and `player_iterables.py` are in your program folder.  You'll need to import content from these to replicate the tutorial examples.

python-isinstance/abstract_class_failure.py

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+from balls_v2 import Ball
+
+test_ball = Ball("white", "sphere")

python-isinstance/ball_instance_test.py

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+from balls import AmericanFootBall, Ball, PoolBall
+
+eight_ball = PoolBall("black", 8)
+football = AmericanFootBall("brown")
+ball = Ball("green", "sphere")
+
+isinstance(eight_ball, PoolBall)
+isinstance(eight_ball, Ball)
+isinstance(eight_ball, AmericanFootBall)
+
+isinstance(eight_ball, object)
+isinstance(football, object)
+isinstance(ball, object)
+isinstance(object, object)

python-isinstance/balls.py

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+class Ball:
+    def __init__(self, color, shape):
+        self.color = color
+        self.shape = shape
+
+
+class PoolBall(Ball):
+    def __init__(self, color, number):
+        super().__init__(color, shape="sphere")
+        self.number = number
+
+
+class AmericanFootBall(Ball):
+    def __init__(self, color):
+        super().__init__(color, shape="prolate spheroid")

python-isinstance/balls_v2.py

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+from abc import ABC, abstractmethod
+
+
+class Ball(ABC):
+    def __init__(self, color, shape):
+        self.color = color
+        self.shape = shape
+
+    @abstractmethod
+    def get_state(self):
+        pass
+
+
+class PoolBall(Ball):
+    def __init__(self, color, number):
+        super().__init__(color, shape="sphere")
+        self.number = number
+
+    def get_state(self):
+        print(
+            f"Color = {self.color}, Number = {self.number}, Shape = {self.shape}"
+        )
+
+
+class AmericanFootBall(Ball):
+    def __init__(self, color):
+        super().__init__(color, shape="prolate spheroid")
+
+    def get_state(self):
+        print(f"Color = {self.color}, Shape = {self.shape}")

python-isinstance/basic_types.py

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+shape = "Sphere"
+number = 8
+
+isinstance(shape, str)
+isinstance(number, int)
+isinstance(number, float)

python-isinstance/bool_int_test.py

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+isinstance(True, int)
+
+isinstance(True, bool)
+
+isinstance(False, int)
+
+isinstance(False, bool)
+
+test_data = [10, True, False]
+
+for element in test_data:
+    print("int") if isinstance(element, int) else print("bool")
+
+for element in test_data:
+    print("bool") if isinstance(element, bool) else print("int")
+
+for element in test_data:
+    print("bool") if type(element) is bool else print("int")  # noqa

python-isinstance/calculate_area_v1.py

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+def calculate_area(length, breadth):
+    return length * breadth
+
+
+calculate_area(5, 3)
+calculate_area(5, "3")
+calculate_area("5", "3")

python-isinstance/calculate_area_v2.py

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+def calculate_area(length, breadth):
+    if isinstance(length, int) and isinstance(breadth, int):
+        return length * breadth
+    raise TypeError("Both arguments must be integers")
+
+
+calculate_area(5, 3)
+calculate_area(5, "3")
+calculate_area("5", "3")

python-isinstance/consolidation1_solution.py

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+from balls import AmericanFootBall, Ball, PoolBall
+
+ball = Ball("green", "sphere")
+football = AmericanFootBall("brown")
+
+isinstance(football, AmericanFootBall)
+
+isinstance(football, PoolBall)
+
+isinstance(ball, Ball)
+
+isinstance(ball, AmericanFootBall)
+
+isinstance(football, Ball)
+
+isinstance(ball, PoolBall)
+
+isinstance(1, bool)
+
+isinstance(0, bool)