/usr/lib/python2.7/dist-packages/pysnmp/smi/mibs/instances/__SNMP-VIEW-BASED-ACM-MIB.py is in python-pysnmp4 4.2.5-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/pysnmp/smi/mibs/instances/../../../../../../../share/pyshared/pysnmp/smi/mibs/instances/__SNMP-VIEW-BASED-ACM-MIB.py