Problem Set 2 Exercise 1

circle.py

@@ -0,0 +1,25 @@
+from math import pi
+
+#Defining Circle class
+class Circle: 
+    def __init__(self, radius: float):
+        self.radius = radius
+
+    #Calculating perimeter of circle     
+    def perimeter(self):
+        return 2 * pi * self.radius
+
+    #Calculating area of circle
+    def area(self): 
+        return pi * self.radius ** 2
+
+    #Defining calculation function based on selected operation
+    def perform_cir_calc(self, operation: str) -> float: 
+        if operation == 'perimeter':
+            return f'This circle has a perimeter of {round(self.perimeter(), 2)} cm.'
+        elif operation == 'area':
+            return f'This circle has an area of {round(self.area(), 2)} cm.'
+
+#Converting radius input into float
+def convert_radius_to_float(radius: str) -> float:
+    return float(radius)

flask_app.py

@@ -1,11 +1,13 @@
 from flask import Flask, render_template, request
-
 from helper import perform_calculation, convert_to_float
+from circle import Circle, convert_radius_to_float
 
 app = Flask(__name__)  # create the instance of the flask class
 
 
 @app.route('/')
+
+
 @app.route('/home')
 def home():
     return render_template('home.html')
@@ -38,3 +40,25 @@ def calculate():
             return render_template('calculator.html', printed_result="You cannot divide by zero")
 
     return render_template('calculator.html')
+
+
+@app.route('/circle', methods=['GET', 'POST'])
+def circle():
+    if request.method == 'POST':
+        radius = request.form['radius']
+        operation = request.form['operation']
+
+        try:
+            radius = convert_radius_to_float(radius=radius)
+        except ValueError:
+            return render_template('circle.html', printed_result="Radius must be a number")
+
+        if radius <= 0:
+            return render_template('circle.html', printed_result="Radius must be a positive number")
+
+        circle_instance = Circle(radius)
+        result = circle_instance.perform_cir_calc(operation=operation)
+
+        return render_template('circle.html', printed_result=result)
+
+    return render_template('circle.html')

templates/circle.html

@@ -0,0 +1,20 @@
+{% extends 'layout.html' %}
+{% block content %}
+	<h1>Circle Calculator</h1>
+    <form method="post">
+        <input type="text" name="radius" placeholder="Enter the radius in cm" required="required" />
+
+        <label for="">Operation</label>
+        <select id="operation" name="operation">
+            <option value="perimeter">perimeter</option>
+            <option value="area">area</option>
+        </select>    
+
+        <button type="submit">Calculate</button>
+    </form>
+
+   <br>
+
+   {{ printed_result }}
+
+{% endblock %}

templates/layout.html

@@ -12,6 +12,7 @@ <h1 class="logo"><a href="{{ url_for('home') }}">Home</a></h1>
         <strong><nav>
           <ul class="menu">
             <li><a href="{{ url_for('calculate') }}">General Calculator</a></li>
+            <li><a href="{{ url_for('circle') }}">Circle Calculator</a></li>
           </ul>
         </nav></strong>
       </div>

test_circle.py

@@ -0,0 +1,24 @@
+
+#Testing both methods in circle.py
+import pytest
+from math import pi
+from circle import Circle
+
+# Tests for perimeter calculation with positive float input
+def test_perimeter():
+
+    #creating instance for radius = 2
+    circle_instance = Circle(radius = 2)
+    expected_perim_result = f'This circle has a perimeter of {round(2 * pi * 2, 2)} cm.'
+    actual_perim_result = circle_instance.perform_cir_calc('perimeter')
+    assert actual_perim_result == expected_perim_result, "Perimeter calculation test failed!"
+
+
+# Tests for area calculation
+def test_area():
+
+    #creating instance for radius = 2
+    circle_instance = Circle(radius = 2)
+    expected_area_result = f'This circle has an area of {round(pi * 2 ** 2, 2)} cm.'
+    actual_area_result = circle_instance.perform_cir_calc('area')
+    assert actual_area_result == expected_area_result, "Area calculation test failed!"