Add python 3.7 example

presentation/presentation.tex

@@ -174,8 +174,13 @@ \section{Docker}
 docker run --rm -it --link my-tmp-db \
     mysql \
     mysql -h my-tmp-db -px
+
+docker run ... python:3.7-rc-alpine ...
+
 \end{verbatim}
 
+\pause
+
 \end{frame}
 
 \begin{frame}{Big benefit for everyone}

python-3.7/dataclass_example.py

@@ -0,0 +1,14 @@
+from dataclasses import dataclass
+
+@dataclass
+class InventoryItem:
+    '''Class for keeping track of an item in inventory.'''
+    name: str
+    unit_price: float
+    quantity_on_hand: int = 0
+
+    def total_cost(self) -> float:
+        return self.unit_price * self.quantity_on_hand
+
+i = InventoryItem(name='Socks', unit_price=12.75, quantity_on_hand=14)
+print(f"${i.total_cost()} worth of {i.name} on hand")

python-3.7/run

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+DIR="$(cd "$(dirname -- "${0}")" && pwd)"
+
+exec docker run --rm -v $DIR:/app python:3.7-rc-alpine python \
+    /app/dataclass_example.py