environ import is used only in __main__

diff --git a/pyderasn.py b/pyderasn.py
index 5292c5cf70fb5d195a39efde500a8b9a6f7cc443..6da6e92706e2186339505e65c7743bc64f14ce89 100755 (executable)
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -671,7 +671,6 @@ from copy import copy
 from datetime import datetime
 from datetime import timedelta
 from math import ceil
-from os import environ
 from string import ascii_letters
 from string import digits
 from sys import version_info
@@ -6374,6 +6373,7 @@ def main():  # pragma: no cover
     if args.defines_by_path is not None:
         ctx["defines_by_path"] = obj_by_path(args.defines_by_path)
     obj, tail = schema().decode(der, ctx=ctx)
+    from os import environ
     print(pprinter(
         obj,
         oid_maps=oid_maps,