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Dockerfile

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+FROM python:latest
+
+WORKDIR /app
+
+ENV PIP_NO_CACHE_DIR=1\
+	PIP_DISABLE_PIP_VERSION_CHECK=1
+
+COPY requirements.txt /app/requirements.txt
+
+RUN --mount=type=cache,target=/root/.cache/pip \
+	pip install --upgrade pip -r /app/requirements.txt
+
+COPY flaskApp.py /app/flaskApp.py
+
+USER root
+
+CMD ["python", "flaskApp.py", "--host", "0.0.0.0", "--port", "80"]

flaskApp.py

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+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+    return "Привет из Docker!"
+
+if __name__ == '__main__':
+    app.run(debug=True, host='0.0.0.0', port=80)
+
+from flask import Flask
+
+app = Flask(__name__)