Change method to generate uid

The uid of the same lesson is now same,
so the same lesson will not be imported twice.

Author: reekystive

calender.py

@@ -7,26 +7,29 @@ class Event:
     begin = ''
     end = ''
     description = ''
+    identifier = ''  # used to generate uid
 
     def __init__(self) -> None:
         pass
 
     def get_str(self) -> None:
         begin_str = self.begin.strip() \
-            .replace(' ', 'T').replace('-', '').replace(':', '')
+            .replace(' ', 'T').replace('-', '').replace(':', '') + '00'
         end_str = self.end.strip() \
-            .replace(' ', 'T').replace('-', '').replace(':', '')
+            .replace(' ', 'T').replace('-', '').replace(':', '') + '00'
         disc_str = self.description.strip() \
             .replace('\n', '\\n')
         name_str = self.name.strip() \
             .replace('\n', '\\n')
-        uid_str = str(uuid.uuid4())
+
+        namespace = uuid.UUID('7e6ec0dd-0d77-41d1-82b4-4469894007dd')
+        uid_str = str(uuid.uuid3(namespace, self.identifier))
         uid_str = uid_str + '@' + uid_str[:4] + '.org'
 
         s = ''
         s += 'BEGIN:VEVENT\n'
-        s += 'DTSTART;TZID=Asia/Shanghai:' + begin_str + '00\n'
-        s += 'DTEND;TZID=Asia/Shanghai:' + end_str + '00\n'
+        s += 'DTSTART;TZID=Asia/Shanghai:' + begin_str + '\n'
+        s += 'DTEND;TZID=Asia/Shanghai:' + end_str + '\n'
         s += 'UID:' + uid_str + '\n'
         s += 'DESCRIPTION:' + disc_str + '\n'
         s += 'SUMMARY:' + name_str + '\n'

course.py

@@ -207,6 +207,9 @@ def generate_ics(self, courses: List, first_date: str) -> None:
                 disc += '授课老师: ' + course['teacher']
                 e.description = disc
 
+                e.identifier = begin_str + ' ' + course['code']
+                # used to generate uid
+
                 c.add(e)
 
         with open('courses.ics', 'w', encoding='utf-8', newline='\n') as ics_file: