lextab.py syntax error

[bcail]

I just installed eulxml into a python 3.6 virtual environment. I got the following warning: "yacc table file version is out of date". Then, when I quit ipython and started it again, I got an Invalid Syntax error pointing to the following line in lextab.py: _lexreflags = <RegexFlag.UNICODE: 32>.

It looks like lextab.py was generated by ply 3.9, but my install pulled in ply 3.10. When I switched to ply 3.9, the problem went away. Should ply be pegged to a specific release in setup.py, so this doesn't happen?

[cormier]

@bcail I submitted a PR that will hopefully fix this issue. 😄

However I find it puzzling that downgrading to ply 3.9 solved this issue.

[joson-cn]

解决方法：1、降低ply版本，2、新生成文件替换原来的文件。

python3

from cffi import FFI
_ffi = FFI()
_ffi.cdef("""
... int rpmvercmp (const char *a, const char *b);
... """)
warning：yacc table file version is out of date。
以上命令可复现warning。

不报警告版本：
rpm -qa|grep -E "python3-ply|python3-pycparser"
python3-ply-3.9-9.ky10.noarch
python3-pycparser-2.20-2.ky10.noarch

python3
>>> import ply
>>> ply.version
'3.9'

grep tabversion /usr/lib/python3.7/site-packages/pycparser/yacctab.py
_tabversion = '3.8' //这个版本是正常的，上面的version=3.9，这里的_tabversion=3.8，与下面的版本对上，所以不报警告。

grep "version__" /usr/lib/python3.7/site-packages/ply/yacc.py
version = '3.9'
tabversion = '3.8'

============
报警告版本：
rpm -qa|grep -E "python3-ply|python3-pycparser"
python3-ply-3.11-1.ky10.noarch
python3-pycparser-2.20-2.ky10.noarch

python3
>>> import ply
>>> ply.version
'3.11'

grep tabversion /usr/lib/python3.7/site-packages/pycparser/yacctab.py
_tabversion = '3.8' //这里的版本过低导致报warning，上面的version=3.11，这里的_tabversion=3.8，与下面的两个版本对不上，所以报警告。

grep "version__" /usr/lib/python3.7/site-packages/ply/yacc.py
version = '3.11'
tabversion = '3.10'

warning在当前目录下生成的py文件中的版本：
grep tabversion yacctab.py
_tabversion = '3.10'
grep tabversion lextab.py
_tabversion = '3.10'