'Solution'

app/main.py

@@ -1,3 +1,37 @@
+from __future__ import annotations
+
+
 class OnlineCourse:
-    # write your code here
-    pass
+    def __init__(self, name: str, description: str, weeks: int) -> None:
+        self.name = name
+        self.description = description
+        self.weeks = weeks
+
+    @staticmethod
+    def days_to_weeks(days: int) -> int:
+        if not isinstance(days, int):
+            raise TypeError("days must be an integer.")
+        return -(-days // 7)
+
+    @classmethod
+    def from_dict(cls, course_dict: dict) -> OnlineCourse:
+        if not isinstance(course_dict, dict):
+            raise TypeError("course_dict must be a dictionary.")
+        required_keys = ["name", "description", "days"]
+        for key in required_keys:
+            if key not in course_dict:
+                raise ValueError(f"Missing required key: {key}")
+        name = course_dict["name"]
+        description = course_dict["description"]
+        days = course_dict["days"]
+        if not isinstance(name, str):
+            raise TypeError(f"Expected 'name' "
+                            f"to be a string, got {type(name).__name__}.")
+        if not isinstance(description, str):
+            raise TypeError(f"Expected 'description' to be a string, "
+                            f"got {type(description).__name__}.")
+        if not isinstance(days, int):
+            raise TypeError(f"Expected 'days' "
+                            f"to be an integer, got {type(days).__name__}.")
+        weeks = cls.days_to_weeks(days)
+        return cls(name=name, description=description, weeks=weeks)