chg: Add deprecation warning for Python < 3.8

pymisp/__init__.py

@@ -1,5 +1,7 @@
 __version__ = '2.4.138'
 import logging
+import sys
+import warnings
 
 FORMAT = "%(levelname)s [%(filename)s:%(lineno)s - %(funcName)s() ] %(message)s"
 formatter = logging.Formatter(FORMAT)
@@ -11,6 +13,14 @@ logger.addHandler(default_handler)
 logger.setLevel(logging.WARNING)
 
 
+def warning_2022():
+    if sys.version_info < (3, 8):
+        warnings.warn("""
+As our baseline system is the latest Ubuntu LTS, and Ubuntu LTS 20.04 has Python 3.8 available,
+we will officially deprecate python versions below 3.8 on January 1st 2022.
+**Please update your codebase.**""", DeprecationWarning, stacklevel=3)
+
+
 everything_broken = '''Unknown error: the response is not in JSON.
 Something is broken server-side, please send us everything that follows (careful with the auth key):
 Request headers:
@@ -22,6 +32,7 @@ Response (if any):
 
 
 try:
+    warning_2022()
     from .exceptions import PyMISPError, NewEventError, NewAttributeError, MissingDependency, NoURL, NoKey, InvalidMISPObject, UnknownMISPObjectTemplate, PyMISPInvalidFormat, MISPServerError, PyMISPNotImplementedYet, PyMISPUnexpectedResponse, PyMISPEmptyResponse  # noqa
     from .abstract import AbstractMISP, MISPEncode, pymisp_json_default, MISPTag, Distribution, ThreatLevel, Analysis  # noqa
     from .mispevent import MISPEvent, MISPAttribute, MISPObjectReference, MISPObjectAttribute, MISPObject, MISPUser, MISPOrganisation, MISPSighting, MISPLog, MISPShadowAttribute, MISPWarninglist, MISPTaxonomy, MISPNoticelist, MISPObjectTemplate, MISPSharingGroup, MISPRole, MISPServer, MISPFeed, MISPEventDelegation, MISPUserSetting, MISPInbox, MISPEventBlocklist, MISPOrganisationBlocklist, MISPEventReport, MISPGalaxyCluster, MISPGalaxyClusterElement, MISPGalaxyClusterRelation # noqa