seed: curriculum content

1.solar-system/2.first-light/08.the-formatter/index.md

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+---
+type: challenge
+title: "The Formatter"
+xp: 50
+duration: 25
+difficulty: 2
+---
+
+# The Formatter
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, raw numbers like `9.99` print fine, but `29.970000000000002`
+> doesn't. Real programs *format* numbers. f-strings can do it inline:
+>
+> ```python
+> price = 9.99
+> f"${price:.2f}"   # → "$9.99"
+> ```
+>
+> The `:.2f` is a *format spec*: two decimal places, fixed-point.
+>
+> Implement `format_receipt(price, qty)` that returns a 3-line string:
+>
+> ```
+> Item price: $<price>
+> Quantity: <qty>
+> Total: $<price * qty>
+> ```
+>
+> Both prices use 2-decimal formatting. Use `\n` to join lines.
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+Open `starter/starter.py`. Compute `total`, then return a single
+f-string with `\n` separators.
+
+## Objectives
+
+- `format_receipt(9.99, 3)` returns the exact 3-line string
+- Prices format to 2 decimal places
+- Works for any positive `price` and `qty`

1.solar-system/2.first-light/08.the-formatter/starter/starter.py

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+def format_receipt(price, qty):
+    """Return a 3-line formatted receipt as a single string.
+
+    Format (note the dollar sign and 2-decimal places on prices):
+
+      Item price: $<price>
+      Quantity: <qty>
+      Total: $<price * qty>
+
+    format_receipt(9.99, 3) returns:
+      "Item price: $9.99\nQuantity: 3\nTotal: $29.97"
+    """
+    pass

1.solar-system/2.first-light/08.the-formatter/testing/test_solution.py

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+from solution import format_receipt
+
+
+def test_basic():
+    assert format_receipt(9.99, 3) == "Item price: $9.99\nQuantity: 3\nTotal: $29.97"
+
+
+def test_round_numbers():
+    assert format_receipt(100, 1) == "Item price: $100.00\nQuantity: 1\nTotal: $100.00"
+
+
+def test_decimal_quantity_one():
+    assert format_receipt(1.5, 10) == "Item price: $1.50\nQuantity: 10\nTotal: $15.00"