python3 server.py时出错

[justDoForever]

你能帮我解决一下吗，谢谢

[justDoForever]

graphy. PLease upgrade your Python.
Traceback (most recent call last):
File "server .py", line 4, in
import re_ encryption
File " reencryption client/re encryption.py", line 4, in
from umbral import pre
File " /home/whc/ .Local/lib/python3. 5/site-packages/ umbral/pre.py", line 22，in
from bytestring. splitter import BytestringSplitter
File "/home/whc/ .local/Lib/python3 .5/site-packages/bytestring splitter/__ init__ .py", line 76
raise AttributeError(f"{self.__ class__ } doesn't have a
{message_ name}, and it's not a partially split object either; those are {list(self . processed_ objects.k
eys())}")
| SyntaxError: invalid syntax