前幾天在寫python程式時，遇到了以上問題，在Stackovereflow上找到了解決方案，記錄一下：

Your data contains characters outside of the Basic Multilingual Plane. Emoji's for example, are outside the BMP, and the window system used by IDLE, Tk, cannot handle such characters.

也就是說，開啟的文件中含有BMP基本多文種字面之外的字元，需要以下的程式碼來包含BMP之外的字元：

import sys
non_bmp_map = dict.fromkeys(range(0x10000, sys.maxunicode + 1), 0xfffd)
print(x.translate(non_bmp_map))
 

test測試：

>>> print('This works! \U0001F44D')
This works!