python 3 migration

venv/lib/python3.6/site-packages/certifi/__init__.py

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+from .core import where
+
+__version__ = "2019.06.16"

venv/lib/python3.6/site-packages/certifi/__main__.py

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+from certifi import where
+print(where())

venv/lib/python3.6/site-packages/certifi/core.py

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+# -*- coding: utf-8 -*-
+
+"""
+certifi.py
+~~~~~~~~~~
+
+This module returns the installation location of cacert.pem.
+"""
+import os
+
+
+def where():
+    f = os.path.dirname(__file__)
+
+    return os.path.join(f, 'cacert.pem')