Solution

app/main.py

@@ -1 +1,62 @@
-# write your code here
+import dataclasses
+import pickle
+from datetime import datetime
+
+
+@dataclasses.dataclass
+class Specialty:
+    name: str
+    number: int
+
+
+@dataclasses.dataclass
+class Student:
+    first_name: str
+    last_name: str
+    birth_date: datetime
+    average_mark: float
+    has_scholarship: bool
+    phone_number: str
+    address: str
+
+
+@dataclasses.dataclass
+class Group:
+    specialty: Specialty
+    course: int
+    students: list
+
+
+def write_groups_information(groups: list) -> int:
+    with open("groups.pickle", "wb") as file:
+        max_size_group = 0
+        for group in groups:
+            if max_size_group < len(group.students):
+                max_size_group = len(group.students)
+        pickle.dump(groups, file)
+    return max_size_group
+
+
+def write_students_information(students: list) -> int:
+    with open("students.pickle", "wb") as file:
+        pickle.dump(students, file)
+    return len(students)
+
+
+def read_students_information() -> list:
+    list_students = []
+    with open("students.pickle", "rb") as file:
+        tmp = pickle.load(file)
+        for student in tmp:
+            list_students.append(student)
+    return list_students
+
+
+def read_groups_information() -> list:
+    list_speciality = []
+    with open("groups.pickle", "rb") as file:
+        tmp = pickle.load(file)
+        for group in tmp:
+            if group.specialty.name not in list_speciality:
+                list_speciality.append(group.specialty.name)
+    return list_speciality