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x.py

+import tkinter as tk
+import tkinter.ttk as ttk
+from tkinter import *
+import tkcalendar
+from tkcalendar import Calendar, DateEntry
+import datetime
+
+root = tk.Tk()
+
+muisutukset={'2022-01-05':('kokous'),\
+    '2022-01-15':('kokous'),\
+    '2022-03-10':('kokous')}
+
+cal = Calendar(root, selectmode='day', year=2022, month=1)
+
+for k in muisutukset.keys():
+    date=datetime.datetime.strptime(k,"%Y-%m-%d").date()
+    cal.calevent_create(date, muisutukset[k][0], muisutukset[k][1])
+
+cal.tag_config('kokous', background='red', foreground='yellow')
+cal.pack(fill="both", expand=True)
+
+root.mainloop()
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