seed: curriculum content

1.solar-system/3.strings/04.the-validator/index.md

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+---
+type: challenge
+title: "The Validator"
+xp: 75
+duration: 30
+difficulty: 2
+---
+
+# The Validator
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, every system that takes user input has to *validate* it.
+>
+> Comparison operators (`>=`, `<`, `==`) return `True` or `False`
+> directly. String methods like `.isupper()` and `.isdigit()` also
+> return booleans:
+>
+> ```python
+> len("hello") >= 8       # False
+> "Hello"[0].isupper()    # True
+> "abc1"[-1].isdigit()    # True
+> ```
+>
+> Implement `validate(pw)` that returns a dict with four checks on
+> a non-empty password:
+>
+> - `length` — char count (int)
+> - `long_enough` — `length >= 8` (bool)
+> - `starts_capital` — first char uppercase (bool)
+> - `ends_digit` — last char a digit (bool)
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+In `starter/starter.py`, return the dict using `len()`, `>=`,
+`.isupper()`, `.isdigit()`.
+
+## Objectives
+
+- All four keys present with correct types
+- `validate("Andromeda1")` matches the expected dict exactly
+- Works for any non-empty password

1.solar-system/3.strings/04.the-validator/starter/starter.py

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+def validate(pw):
+    """Check four properties of a non-empty password and return a dict.
+
+    Keys:
+      "length"         — number of characters (int)
+      "long_enough"    — True if length >= 8 (bool)
+      "starts_capital" — True if first char is uppercase (bool)
+      "ends_digit"     — True if last char is a digit (bool)
+
+    Helpers:
+      pw[0].isupper()  — True if first char is uppercase
+      pw[-1].isdigit() — True if last char is a digit
+
+    validate("Andromeda1") -> {"length": 10, "long_enough": True,
+                              "starts_capital": True, "ends_digit": True}
+    """
+    pass

1.solar-system/3.strings/04.the-validator/testing/test_solution.py

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+from solution import validate
+
+
+def test_strong_password():
+    r = validate("Andromeda1")
+    assert r == {
+        "length": 10,
+        "long_enough": True,
+        "starts_capital": True,
+        "ends_digit": True,
+    }
+
+
+def test_short_lowercase_no_digit():
+    r = validate("abc")
+    assert r == {
+        "length": 3,
+        "long_enough": False,
+        "starts_capital": False,
+        "ends_digit": False,
+    }
+
+
+def test_capital_no_digit():
+    r = validate("Hello")
+    assert r == {
+        "length": 5,
+        "long_enough": False,
+        "starts_capital": True,
+        "ends_digit": False,
+    }
+
+
+def test_long_lowercase_with_digit():
+    r = validate("spaceX2026")
+    assert r == {
+        "length": 10,
+        "long_enough": True,
+        "starts_capital": False,
+        "ends_digit": True,
+    }