HW for 6_15

2023-06-15 11:34:03 -05:00
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+class BananaContextManager:
+    def __init__(self, banana_list):
+        self.banana_list = banana_list
+
+    def __enter__(self):
+        self.banana_list.append("🍌")  # Add a banana to the list
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.banana_list:  # Check if the list is not empty
+            self.banana_list.pop()  # Remove a banana from the list
+my_banana_list = []
+with BananaContextManager(my_banana_list):
+    print(my_banana_list) 
+print(my_banana_list)  # Output: []
+
+#Questions: can you use a with block inside of another with block? 
+class BananaContextManager:
+    def __init__(self, banana_list):
+        self.banana_list = banana_list
+
+    def __enter__(self):
+        self.banana_list.append("🍌")  # Add a banana to the list
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.banana_list:  # Check if the list is not empty
+            self.banana_list.pop()  # Remove a banana from the list
+my_banana_list = []
+with BananaContextManager(my_banana_list) as outer_cm:
+    print(my_banana_list)  
+    
+    with BananaContextManager(outer_cm.banana_list) as inner_cm:
+        inner_cm.banana_list.append("🍌")  # Add another banana to the list
+        print(my_banana_list)  
+        
+        inner_cm.banana_list.pop()  # Remove a banana from the list
+        print(my_banana_list)  
+    
+    print(my_banana_list) 
+    
+print(my_banana_list) 
+#The number of bananas in the list are 1,3,2,1,0.
+
+#question:can you structure the program so that you can get the class to have more than 0 bananas *outside* of a with block?
+class BananaContextManager:
+    def __init__(self, banana_list, initial_bananas=0):
+        self.banana_list = banana_list
+        self.initial_bananas = initial_bananas
+
+    def __enter__(self):
+        for _ in range(self.initial_bananas):
+            self.banana_list.append("🍌")
+        self.banana_list.append("🍌")  # Add a banana to the list
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.banana_list:  # Check if the list is not empty
+            self.banana_list.pop()  # Remove a banana from the list
+
+# Usage example
+my_banana_list = []
+banana_count = 1  # Number of bananas outside the with block
+
+with BananaContextManager(my_banana_list, banana_count) as outer_cm:
+    print(my_banana_list)  
+    
+    with BananaContextManager(outer_cm.banana_list) as inner_cm:
+        inner_cm.banana_list.append("🍌")  # Add another banana to the list
+        print(my_banana_list)  
+        
+        inner_cm.banana_list.pop()  # Remove a banana from the list
+        print(my_banana_list)  
+    
+    print(my_banana_list)  
+    
+print(my_banana_list) 
+
+#Update notes:
+#salting: 
+#Let's say we have two users, Alice and Bob, who both have the same password, "password123". Without salting, 
+#if we were to hash their passwords directly, they would produce the same hash value:
+'''''
+Alice's Password: password123
+Bob's Password: password123
+
+Hashed Password (Alice and Bob): 7c6a180b36896a0a8c02787eeafb0e4c7b07a52e
+'''''
+#As you can see, the hashed passwords for both Alice and Bob are the same. This could be a problem because if an attacker obtains the hash value,
+#they can easily determine that Alice and Bob have the same password.
+#Now, let's introduce salting to the process. Each user will have a unique salt that is added to their password before hashing. 
+# Here's an updated example:
+'''''
+Alice's Password: password123
+Bob's Password: password123
+
+Alice's Salt: QGdG9jzV
+Bob's Salt: d8K27fsE
+
+Salted and Hashed Password (Alice): QGdG9jzVpassword123 -> 48cf6b7b4b04819f6d717c9bc67a4feae0f1081a
+Salted and Hashed Password (Bob): d8K27fsEpassword123 -> d5fd5b3a42f8e6bc8c9844feeff24f4cb4fd8fa4
+
+'''''
+#Now, even though Alice and Bob have the same password, their hashed passwords are different 
+#because they used different salts. The salt makes each hash unique, even when the passwords are the same.
+
+#Rich comparison methods:
+#Rich comparison methods allow objects to be compared using operators like <, >, ==, etc. By implementing these
+#methods in a class, you can define how objects of that class should be compared. Here's an example 
+#using the __eq__ method to compare two Point objects:
+class Point:
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+
+    def __eq__(self, other):
+        return self.x == other.x and self.y == other.y
+
+point1 = Point(1, 2)
+point2 = Point(1, 2)
+point3 = Point(3, 4)
+
+print(point1 == point2)  # Output: True
+print(point1 == point3)  # Output: False
+
+#Swapped-argument versions:
+#Swapped-argument versions of methods provide flexibility when working with commutative operations. 
+#For example, if you have a class representing a mathematical operation and want to support swapping the operands, 
+#you can define a swapped-argument version of the method. 
+
+#Hashed collections:
+#Hashed collections like dictionaries (dict) and sets (set) use hash functions internally to efficiently store 
+#and retrieve data. Here's an example using a dictionary:
+my_dict = {'apple': 5, 'banana': 3, 'orange': 2}
+
+print(my_dict['apple'])  # Output: 5
+print(my_dict.get('banana'))  # Output: 3
+
+#Dictionary insertion:
+#Dictionary insertion refers to adding key-value pairs to a dictionary. Here's an example:
+my_dict = {'apple': 5, 'banana': 3}
+
+# Inserting a new key-value pair
+my_dict['orange'] = 2
+
+print(my_dict)  # Output: {'apple': 5, 'banana': 3, 'orange': 2}
+
+#Multiple inheritance:
+#Multiple inheritance allows a class to inherit from multiple base classes. Here's a simplified example:
+class Base1:
+    def method1(self):
+        print("Base1 method")
+
+class Base2:
+    def method2(self):
+        print("Base2 method")
+
+class MyClass(Base1, Base2):
+    pass
+
+my_object = MyClass()
+my_object.method1()  # Output: Base1 method
+my_object.method2()  # Output: Base2 method
+
+#AI cannot give me practcial examples about Intentional asymmetry and Cryptography.