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fix pypy3-3.3 have error
File "/opt/pypy3/site-packages/flask/init.py", line 21, in
from .app import Flask, Request, Response
File "/opt/pypy3/site-packages/flask/app.py", line 24, in
from .helpers import _PackageBoundObject, url_for, get_flashed_messages,
File "/opt/pypy3/site-packages/flask/helpers.py", line 42, in
from ._compat import string_types, text_type
File "/opt/pypy3/site-packages/flask/_compat.py", line 82, in
raise AssertionError()
File "/opt/pypy3/site-packages/flask/_compat.py", line 78, in exit
sys.exc_clear()
AttributeError: 'module' object has no attribute 'exc_clear'