Stackoverflow 回答：
將byte類型轉化：byte_string.decode('utf-8')
Jinja2 is using Unicode internally which means that you have to pass Unicode objects to the render function or
bytestrings that only consist of ASCII characters.
A normal string in Python 2.x is a bytestring. To make it unicode use:
byte_string = 'a Python string which contains non-ascii data like €äãü'
unicode_string = byte_string.decode('utf-8')