save project

my_tree.py

@@ -22,7 +22,7 @@ w = turtle.Screen()
 w.bgcolor('wheat')  
 
 
-pen.lt(0)
+pen.lt()
 pen.up()
 pen.bk(500)
 pen.down()

工程硕士.py

+sb= [1,3,5,8,11,13,15,17,20,21]
+sb= [1,3,5,8,11,13,15,17,20,21]
+n=20
+low=0
+high=len(sb)-1
+dm=(low+high)//2
+if sb[dm]=n:
+        if sb=n:
+            print("ok")
+            break
+        elif sb<n:
+            low=<dm+1
+        elif 
+            high=dm-1  
\ No newline at end of file