seed: curriculum content

1.solar-system/3.strings/01.the-message/index.md

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+---
+type: challenge
+title: "The Message"
+xp: 50
+duration: 25
+difficulty: 2
+---
+
+# The Message
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, a string is a *sequence of characters*. You can pick any
+> one out by its position (its *index*).
+>
+> Indexes start at 0:
+>
+> ```
+>   M  I  S  S  I  O  N
+>   0  1  2  3  4  5  6
+> ```
+>
+> Negative indexes count back from the end. `s[-1]` is the last
+> character.
+>
+> Strings are *immutable* — you can read any character, but you can't
+> change one in place. To "modify" a string, you build a new one.
+>
+> Implement `info(s)` that returns a dict with four keys: `first`,
+> `sixth`, `last`, `length`.
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+Open `starter/starter.py`. Use `s[0]`, `s[5]`, `s[-1]`, and `len(s)`
+to fill in the dict.
+
+## Objectives
+
+- `info("MISSION-CONTROL-7")` returns `{"first": "M", "sixth": "O", "last": "7", "length": 17}`
+- Works for any non-empty string of length ≥ 6

1.solar-system/3.strings/01.the-message/starter/starter.py

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+def info(s):
+    """Return a dict describing the string s.
+
+    Keys:
+      "first"  — the character at index 0
+      "sixth"  — the character at index 5
+      "last"   — the character at index -1
+      "length" — total number of characters
+
+    info("MISSION-CONTROL-7") -> {"first": "M", "sixth": "O",
+                                  "last": "7", "length": 17}
+    """
+    pass

1.solar-system/3.strings/01.the-message/testing/test_solution.py

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+from solution import info
+
+
+def test_mission_control():
+    r = info("MISSION-CONTROL-7")
+    assert r == {"first": "M", "sixth": "O", "last": "7", "length": 17}
+
+
+def test_andromeda():
+    r = info("andromeda")
+    assert r == {"first": "a", "sixth": "m", "last": "a", "length": 9}
+
+
+def test_alphabet():
+    r = info("ABCDEFGH")
+    assert r == {"first": "A", "sixth": "F", "last": "H", "length": 8}