String slicing

String_Slicing/string_slicing.py

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+text = "Hello, Python!"
+print("Original string:", text)
+print("Character at index 0:", text[0])       
+print("Character at index 7:", text[7])      
+print("Last character:", text[-1])           
+print("Second last character:", text[-2])     
+print("\nSlicing examples:")
+print("Substring from index 0 to 5:", text[0:5])   
+print("Substring from index 7 to end:", text[7:]) 
+print("Substring from start to index 5:", text[:5])
+print("Whole string using slice:", text[:])        
+print("\nSlicing with step values:")
+print("Every second character:", text[::2])
+print("Reversed string:", text[::-1])
+print("Substring with step of 3:", text[::3])
+print("\n--- User Input Example ---")
+user_string = input("Enter a string: ")
+start = int(input("Enter start index: "))
+end = int(input("Enter end index: "))
+step = int(input("Enter step value: "))
+print("Sliced string:", user_string[start:end:step])

machine learning .py

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+# Advanced: Machine Learning Classifier Example
+from sklearn.datasets import load_iris
+from sklearn.model_selection import train_test_split
+from sklearn.tree import DecisionTreeClassifier
+from sklearn.metrics import accuracy_score
+
+# Load sample dataset
+data = load_iris()
+X, y = data.data, data.target
+
+# Split into train and test
+X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
+
+# Initialize and train the model
+model = DecisionTreeClassifier()
+model.fit(X_train, y_train)
+
+# Make predictions
+predictions = model.predict(X_test)
+
+# Evaluate
+accuracy = accuracy_score(y_test, predictions)
+print(f"✅ Model trained successfully!")
+print(f"Accuracy: {accuracy:.2f}")
+
+# Predict for a single sample
+sample = X_test[0].reshape(1, -1)
+predicted_class = model.predict(sample)[0]
+print(f"Example prediction → Class: {data.target_names[predicted_class]}")

object oriented programing .py

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+# Task #32: Inheritance and Method Overriding Example
+
+class Animal:
+    def __init__(self, name):
+        self.name = name
+
+    def sound(self):
+        return "Some generic animal sound"
+
+# Dog inherits from Animal
+class Dog(Animal):
+    def sound(self):
+        return "Woof! Woof!"
+
+# Cat inherits from Animal
+class Cat(Animal):
+    def sound(self):
+        return "Meow!"
+
+# Demonstration
+animals = [Dog("Buddy"), Cat("Kitty"), Animal("Creature")]
+
+for animal in animals:
+    print(f"{animal.name} says: {animal.sound()}")

string slicing and indexing task .py

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+# String Slicing and Indexing Example
+
+# Input a string from the user
+text = input("Enter a string: ")
+
+# Displaying first and last character
+print("First character:", text[0])
+print("Last character:", text[-1])
+
+# Display a substring (from index 2 to 5)
+print("Substring (index 2 to 5):", text[2:6])
+
+# Reverse the string
+print("Reversed string:", text[::-1])
+
+# Print every second character
+print("Every 2nd character:", text[::2])
+
+# Length of the string
+print("Length of the string:", len(text))