First Dockerfile with python and pip

.python-version

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+3.10.13

Dockerfile

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+FROM ubuntu:22.04 as builder
+
+RUN apt-get update \
+    && apt-get upgrade -y \
+    && apt-get install software-properties-common -y \
+    && add-apt-repository ppa:deadsnakes/ppa -y \
+    && apt-get update
+
+RUN apt-get install python3.10 -y \
+    && apt-get install python3-pip -y
+
+FROM builder
+
+WORKDIR /app
+
+COPY requirements.txt /app
+
+RUN pip install -r requirements.txt
+
+COPY app /app
+
+EXPOSE 5000
+
+ENTRYPOINT [ "python3", "app.py" ]

app/app.py

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+import os
+
+from flask import Flask
+
+app = Flask(__name__)
+
+
+@app.route("/")
+def hello_world():
+    return "Hello, World!"
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0")

app/app_test.py

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+import unittest
+
+from app import app
+
+
+class TestApp(unittest.TestCase):
+    def setUp(self):
+        self.client = app.test_client()
+
+    def test_hello_world(self):
+        response = self.client.get("/")
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.data, b"Hello, World!")
+
+
+if __name__ == "__main__":
+    unittest.main()

requirements.txt

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+blinker==1.6.3 ; python_version >= "3.10" and python_version < "4.0"
+click==8.1.7 ; python_version >= "3.10" and python_version < "4.0"
+colorama==0.4.6 ; python_version >= "3.10" and python_version < "4.0" and platform_system == "Windows"
+flask==3.0.0 ; python_version >= "3.10" and python_version < "4.0"
+itsdangerous==2.1.2 ; python_version >= "3.10" and python_version < "4.0"
+jinja2==3.1.2 ; python_version >= "3.10" and python_version < "4.0"
+markupsafe==2.1.3 ; python_version >= "3.10" and python_version < "4.0"
+werkzeug==3.0.0 ; python_version >= "3.10" and python_version < "4.0"