Merge pull request pravocodes#1 from kumar-karan/my-new-branch

Added Python scripts for calculator, data analysis, to-do list

Python/calculator.py

@@ -0,0 +1,42 @@
+# Python program to create a simple calculator
+
+def add(x, y):
+    return x + y
+
+def subtract(x, y):
+    return x - y
+
+def multiply(x, y):
+    return x * y
+
+def divide(x, y):
+    if y == 0:
+        return "Division by zero is not allowed"
+    return x / y
+
+print("Select operation:")
+print("1. Add")
+print("2. Subtract")
+print("3. Multiply")
+print("4. Divide")
+
+while True:
+    choice = input("Enter choice(1/2/3/4): ")
+
+    if choice in ('1', '2', '3', '4'):
+        num1 = float(input("Enter first number: "))
+        num2 = float(input("Enter second number: "))
+
+        if choice == '1':
+            print(f"The result is: {add(num1, num2)}")
+
+        elif choice == '2':
+            print(f"The result is: {subtract(num1, num2)}")
+
+        elif choice == '3':
+            print(f"The result is: {multiply(num1, num2)}")
+
+        elif choice == '4':
+            print(f"The result is: {divide(num1, num2)}")
+    else:
+        print("Invalid input")

Python/data_analysis.py

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+import pandas as pd
+import matplotlib.pyplot as plt
+
+
+data = pd.read_csv('data.csv')
+
+print("Data Preview:")
+print(data.head())
+
+print("\nSummary Statistics:")
+print(data.describe())
+
+plt.figure(figsize=(10, 5))
+plt.hist(data['age'], bins=20, color='blue', edgecolor='black')
+plt.title('Age Distribution')
+plt.xlabel('Age')
+plt.ylabel('Frequency')
+plt.show()

Python/matrix_multiplication.py

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+def matrix_multiplication(A, B):
+    result = [[0 for _ in range(len(B[0]))] for _ in range(len(A))]
+
+    for i in range(len(A)):
+        for j in range(len(B[0])):
+            for k in range(len(B)):
+                result[i][j] += A[i][k] * B[k][j]
+
+    return result
+
+A = [[1, 2, 3],
+     [4, 5, 6],
+     [7, 8, 9]]
+
+B = [[9, 8, 7],
+     [6, 5, 4],
+     [3, 2, 1]]
+
+result = matrix_multiplication(A, B)
+
+print("Matrix A:")
+for row in A:
+    print(row)
+print("\nMatrix B:")
+for row in B:
+    print(row)
+print("\nResult of A * B:")
+for row in result:
+    print(row)

Python/to_do_list.py

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+def display_tasks():
+    with open("tasks.txt", "r") as f:
+        tasks = f.readlines()
+        if not tasks:
+            print("No tasks in the to-do list.")
+        else:
+            print("To-Do List:")
+            for i, task in enumerate(tasks):
+                print(f"{i + 1}. {task.strip()}")
+
+def add_task(task):
+    with open("tasks.txt", "a") as f:
+        f.write(task + "\n")
+    print("Task added successfully!")
+
+def remove_task(task_number):
+    with open("tasks.txt", "r") as f:
+        tasks = f.readlines()
+    if task_number > len(tasks) or task_number < 1:
+        print("Invalid task number!")
+    else:
+        del tasks[task_number - 1]
+        with open("tasks.txt", "w") as f:
+            f.writelines(tasks)
+        print("Task removed successfully!")
+
+def main():
+    while True:
+        print("\n1. View Tasks")
+        print("2. Add Task")
+        print("3. Remove Task")
+        print("4. Quit")
+
+        choice = input("Enter your choice: ")
+
+        if choice == "1":
+            display_tasks()
+        elif choice == "2":
+            task = input("Enter the task: ")
+            add_task(task)
+        elif choice == "3":
+            task_number = int(input("Enter task number to remove: "))
+            remove_task(task_number)
+        elif choice == "4":
+            break
+        else:
+            print("Invalid choice!")
+
+if __name__ == "__main__":
+    main()