add code

main.py

+import os
+import time
+
+
+def main():
+    content = '北京欢迎你为你开天辟地…………'
+    while True:
+        # 清理屏幕上的输出
+        os.system('cls')  # os.system('clear')
+        print(content)
+        # 休眠200毫秒
+        time.sleep(0.2)
+        content = content[1:] + content[0]
+
+
+if __name__ == '__main__':
+    main()
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