serialization and deserialization done

main.py

@@ -1,8 +1,20 @@
 import subject
 import user_IO
+import serializer
+import encryption
+import os
 
 subjects = []
+filepath = "/data/user.grades"
 try:
+    password = user_IO.password()
+    if os.path.isfile(filepath):
+        with open(filepath, 'r') as file:
+            string = encryption.decrypt(password, file.read())
+            serializer.deserialize(string)
+
+
+
     while True:
         user_input = user_IO.user_input()
         input_or_output = user_input[0]
@@ -30,7 +42,12 @@ try:
             _subject = user_input[1]
             subject_get = subject.get_subject(subjects, _subject)
             user_IO.user_output(subject_get.return_average_subject)
-    raise SystemError
+        elif input_or_output == "exit":
+            break
+    with open(filepath, 'w') as file:
+        _list = [serializer.serialize(_subject) for _subject in subjects]
+        string = encryption.encrypt(password, str(_list))
+        file.write(string)
 
 except Exception as e:
     print('ERROR' + str(e))

serializer.py

@@ -1,6 +1,49 @@
-def serialize(subject):
-    string = subject.__dict__
-    for category in string["grades"]:
-        for counter, grade in enumerate(string["grades"][category][0]):
-            string["grades"][category][0][counter] = grade.__dict__
+import json
+import subject
+
+
+class TempSubjectSerialize:
+    def __init__(self, _subject):
+        self.name = _subject.name
+        self.main_subject = str(_subject.main_subject)
+        self.oral_exam = str(_subject.oral_exam)
+        self.grades = {}
+        for category in _subject.grades:
+            self.grades[category] = {}
+            for counter, grade in enumerate(_subject.grades[category][0]):
+                self.grades[category][str(counter)] = {
+                    "grade": str(grade.grade),
+                    "name": str(grade.name),
+                    "date": str(grade.date)
+                }
+            self.grades[category]["rating"] = _subject.grades[category][1]
+
+    def get_string(self):
+        string = self.__dict__
+        string = str(string)
+        string = string.replace("'", '"')
+        return string
+
+
+class TempSubjectDeserialize:
+    def __init__(self, string):
+        self.__dict__ = json.loads(string)
+
+
+def serialize(_subject):
+    ser = TempSubjectSerialize(_subject)
+    string = ser.get_string()
     return str(string)
+
+
+def deserialize(string):
+    temp = TempSubjectDeserialize(string)
+    _subject = subject.Subject(temp.name, bool(temp.main_subject), bool(temp.oral_exam))
+    for category in temp.grades:
+        _subject.add_grade_category(category, temp.grades[category]['rating'])
+        for grade in temp.grades[category]:
+            if grade != "rating":
+                _subject.add_grade(category, subject.Grade(float(temp.grades[category][grade]["grade"]),  # the grade
+                                                           temp.grades[category][grade]["name"],  # the name of grade
+                                                           temp.grades[category][grade]["date"]))  # the date of grade
+    return _subject

test.json

@@ -0,0 +1 @@
+{"name": "Deutsch", "main_subject": "False", "oral_exam": "True", "grades": {"schriftlich": {"0": {"grade": "13", "name": "KA1", "date": "2019-08-04 08:25:17.797803"}, "1": {"grade": "9", "name": "KA2", "date": "2019-08-04 08:25:17.797803"}, "rating": 2}, "mündlich": {"0": {"grade": "12", "name": "mündl 1. HJ", "date": "2019-08-04 08:25:17.797803"}, "rating": 1}}}

user_IO.py

@@ -1,5 +1,5 @@
 def user_input():
-    todo = input("Ok, do you want to see them or to edit them [see/edit]?\n")
+    todo = input("Ok, do you want to see them or to edit them [see/edit/exit]?\n")
     if todo == "see":
         print("Which subject do you want to know the information?")
         subject = input()
@@ -31,6 +31,8 @@ def user_input():
             grade = input("Grade? \n")
             grade_name = input("What's the name of the grade? \n")
             return "input", "grade", subject, category, grade, grade_name
+    elif todo == "exit":
+        return "exit"
 
 
 def user_output(subject, categories, average, average_subject):
@@ -42,3 +44,8 @@ def user_output(subject, categories, average, average_subject):
             string += str(grade) + ", "
         print(string + "\n")
         print("The average of {} is {}.".format(subject, average_subject))
+
+
+def password():
+    print("What is your password?")
+    return input()