I made a second attempt for the same work, the circle with yinyang shape with two colors. I tried to use a fuction.

I name the fuction I use tadpole because the half of circle looks like a tadpole with a big head and a short tale.
For the parameter of the tadpole was radius and color intially, but I ran into the error. So, I had to add 'u' and name it again colour. Since color was already fuction defined by turtle.
I started with right 15 degrees to make more close to Korean flag.
I wonder if it is possible to make the circle with red and blue I made can be spinning. If it's possble, can I decide how many times the circle spins and how fast it spins?
My first attempt was fine, it showed the image I wanted to see, but I think this second attempt was better.

drawing.py

@@ -2,26 +2,27 @@
 # ----------
 # By Seoyeon___________
 #
-# (center of Korean flag with two colors, red and blue)
+# (second trial_use fuction_center of Korean flag with two colors)
 
 from turtle import * 
-r=40
+def tadpole (radius,colour):  # "I name half of yinyang shape tadpole"
-left(70)
+    color("black", colour)   # British spellings for colour to distinguish this from color" 
-color("black", "red")
+    begin_fill()
-begin_fill()
+    circle(radius,180)  # half circle
-circle(r,180)  # half circle
+    circle(-radius,180)  # another half circle
-circle(-r,180)  # another half circle
+    circle(-radius*2,180)
-circle(-r*2,180)
+    end_fill() 
-end_fill()
 
-color("black", "blue")
+right(15)
-begin_fill()
+left(90)
-circle(-r*2,180)
+tadpole (40, "red")
-right(180)
+right(90)
-circle(r,180)  # half circle
+penup()
-circle(-r,180)  # another half circle
+forward(160)
+pendown()
+left(90)
+tadpole (40, "blue")
 
-end_fill()
 input()