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+# Python Calculator
+
+A simple console-based calculator implementation in Python for basic mathematical operations.
+## Features
+
+- Addition (+)
+- Subtraction (-) 
+- Multiplication (*)
+- Division (/)
+- Zero division error handling
+- Support for negative numbers and floating-point values
+- Input validation
+
+## Installation
+
+Clone the repository:
+
+
+git clone https://github.com/rentagr/HW2_Git_and_python.git
+cd HW2_Git_and_python
+
+## Usage
+
+Run the calculator:
+python3 HW2_Islamova/calculator.py
+
+Follow the prompts:
+
+    Enter a mathematical expression (example: 5 - 3):
+
+The numbers and the operator must be separated by spaces.
+
+Input first number: a;
+Enter math operation: +, -, *, /;
+Input second number: b;
+
+
+## Example
+
+    Enter a mathematical expression (example: 5 - 3): 15.5 * 2
+    31
+
+## Technologies Used
+
+ Python 3
+
+ Git version control
+
+ GitHub collaboration
+
+## Development Team
+
+Team Members:
+
+    Elena Ivankina - Add function, finding errors and inaccuracies, group communication organization   
+    Anastasia Patrusheva - Sustract function, finding errors and inaccuracies, error correction 
+    Elena Kalita - Multiply funcrion, finding errors and inaccuracies, error correction
+    Mikhail Dobryakov - Division function implementation with zero division handling, finding errors and inaccuracies
+    Renata I. Tagirovna - Project regulation, main calculator function, input validation
+
+![Team](images/Dev_team1.jpg)
+
+![Symbol](images/snake.jpg)
+
+
+## This is an educational project developed for academic purposes
diff --git a/HW2_Islamova/calculator.py b/HW2_Islamova/calculator.py
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+# calculator.py
+
+AVAILABLE_OPERATORS = ['+', '-', '*', '/']
+
+def add(a, b):
+    result = a + b
+    return result
+
+def subtract(a, b):
+    result = a - b
+    return result
+
+def multiply(a, b):
+    result = a * b
+    return result
+
+def divide(a, b):
+    if b == 0:
+        print("Error: Division by zero is not possible")
+        return None
+    result = a / b
+    return result
+
+def main ():
+    while True:
+        # Getting the input expression from the user
+        expression = input("Enter a mathematical expression (example: 5 - 3): ")
+        if not expression:
+            print("Error: empty input")  
+            continue                       
+        # Split the string into parts by spaces
+        parts = expression.split()
+        
+        # Checking the input format
+        if len(parts) != 3:
+            print("Error: Incorrect input format")
+            continue
+        
+        # Checking whether the operands are numbers
+        try:
+            a = float(parts[0])
+            b = float(parts[2])
+        except ValueError:
+            print("Error: the numbers must be numeric or float types")
+            continue
+        
+        # Checking the operand
+        operator = parts[1]
+        if operator not in AVAILABLE_OPERATORS:
+            print(f"Error: unsupported operator '{operator}'. Available operators: {AVAILABLE_OPERATORS}")
+            continue
+        
+    # Select the appropriate function to calculate
+        if operator == '+':
+            result = add(a, b)
+        elif operator == '-':
+            result = subtract(a, b)
+        elif operator == '*':
+            result = multiply(a, b)
+        elif operator == '/':
+            result = divide(a, b)
+        
+        # Output of the result if it is not None
+        if result is not None:
+            print(result)
+            return
+        else:
+            continue
+    
+
+# Start the program
+if __name__ == "__main__":  
+    main()
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