a simple example that mounts to a local directory

simple-mount-example/Dockerfile

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+FROM python:3.8-slim
+
+COPY . /home
+
+RUN mkdir /home/data
+
+CMD ["python3", "/home/main.py"]

simple-mount-example/docker-compose.yml

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+version: "3.5"
+
+services:
+  test:
+    image: tcnichol/test
+    volumes:
+      - /Users/yourUsername/test/data:/home/data

simple-mount-example/main.py

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+import time
+
+def main():
+    test = 'this is only a test'
+    with open('/home/data/test.txt', 'w') as f:
+        f.write(test+'\n')
+    time.sleep(100)
+
+
+if __name__ == '__main__':
+    main()