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index01.py

+start=0
+hide()
+goto(-125,-50)
+setheading(90)
+while True:
+    if start==1:
+        show()
+        forward(4)     # 砖块向前移动
+        if getx()>125 or getx()<-125:    # 如果砖块的移动范围超出-125至125
+            # 用for循环使砖块按半圆的轨迹移动
+            for i in range(60):
+                left(3)
+                forward(2)
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