Add calculator app files for Hugging Face Spaces

.gitattributes

@@ -0,0 +1,5 @@
+*.py linguist-language=Python
+*.md linguist-language=Markdown
+*.txt linguist-language=Text
+*.yml linguist-language=YAML
+*.yaml linguist-language=YAML 

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+name: Python Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.9, 3.10]
+
+    steps:
+    - uses: actions/checkout@v3
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    
+    - name: Run tests
+      run: |
+        pytest test_calculator.py -v 

README.md

@@ -1,6 +1,17 @@
+---
+title: Calculator App
+emoji: 🔢
+colorFrom: blue
+colorTo: purple
+sdk: gradio
+sdk_version: 4.12.0
+app_file: app.py
+pinned: false
+---
+
 # Calculator Application
 
-A modern calculator application built with FastAPI backend and Gradio frontend.
+A simple calculator application built with Gradio and FastAPI.
 
 ## Features
 - Addition
@@ -9,13 +20,17 @@ A modern calculator application built with FastAPI backend and Gradio frontend.
 - Division
 - Clean and intuitive user interface
 - Error handling for invalid operations
-- Division by zero protection
+
+## How to Use
+1. Enter two numbers in the input fields
+2. Select the operation you want to perform
+3. Click the "Calculate" button
+4. View the result in the output field
 
 ## Tech Stack
-- Backend: FastAPI
 - Frontend: Gradio
+- Backend: FastAPI
 - Data Validation: Pydantic
-- API Documentation: Swagger UI (automatically generated)
 
 ## Setup
 

app.py

@@ -0,0 +1,4 @@
+from frontend import demo
+
+if __name__ == "__main__":
+    demo.launch() 

frontend.py

@@ -1,10 +1,14 @@
 import gradio as gr
 import requests
+import os
+
+# Get the backend URL from environment variable or use localhost as fallback
+BACKEND_URL = os.getenv("BACKEND_URL", "http://localhost:8000")
 
 def calculate(num1: float, num2: float, operation: str) -> str:
     try:
         response = requests.post(
-            "http://localhost:8000/calculate",
+            f"{BACKEND_URL}/calculate",
             json={
                 "num1": num1,
                 "num2": num2,
@@ -41,5 +45,6 @@ with gr.Blocks(title="Calculator") as demo:
         outputs=result
     )
 
+# For Hugging Face Spaces
 if __name__ == "__main__":
-    demo.launch() 
+    demo.launch(server_name="0.0.0.0", server_port=7860) 

requirements.txt

@@ -1,5 +1,7 @@
+gradio==4.12.0
+requests==2.31.0
 fastapi==0.104.1
 uvicorn==0.24.0
 pydantic==2.5.2
-gradio==4.12.0
-requests==2.31.0 
+pytest==7.4.3
+httpx==0.25.2 

test_calculator.py

@@ -0,0 +1,48 @@
+import pytest
+from fastapi.testclient import TestClient
+from backend import app
+
+client = TestClient(app)
+
+def test_addition():
+    response = client.post(
+        "/calculate",
+        json={"num1": 5, "num2": 3, "operation": "add"}
+    )
+    assert response.status_code == 200
+    assert response.json()["result"] == 8
+    assert response.json()["operation"] == "add"
+
+def test_subtraction():
+    response = client.post(
+        "/calculate",
+        json={"num1": 5, "num2": 3, "operation": "subtract"}
+    )
+    assert response.status_code == 200
+    assert response.json()["result"] == 2
+    assert response.json()["operation"] == "subtract"
+
+def test_multiplication():
+    response = client.post(
+        "/calculate",
+        json={"num1": 5, "num2": 3, "operation": "multiply"}
+    )
+    assert response.status_code == 200
+    assert response.json()["result"] == 15
+    assert response.json()["operation"] == "multiply"
+
+def test_division():
+    response = client.post(
+        "/calculate",
+        json={"num1": 6, "num2": 2, "operation": "divide"}
+    )
+    assert response.status_code == 200
+    assert response.json()["result"] == 3
+    assert response.json()["operation"] == "divide"
+
+def test_division_by_zero():
+    response = client.post(
+        "/calculate",
+        json={"num1": 5, "num2": 0, "operation": "divide"}
+    )
+    assert response.status_code == 422  # FastAPI returns 422 for validation errors