Accept two character variables and formal parameters.

Sometimes they are the clearest available names, e.g. fd.

Signed-off-by: mulhern <amulhern@redhat.com>

Makefile

@@ -36,8 +36,10 @@ pylint:
 		--disable=I \
 		--disable=bad-continuation \
 		--disable=duplicate-code \
+		--argument-rgx="[a-z_][a-z0-9_]{1,30}" \
 		--exclude-protected=_libudev \
 		--no-docstring-rgx=_.* \
+		--variable-rgx="[a-z_][a-z0-9_]{1,30}" \
 		--msg-template="{path}:{line}: [{msg_id}({symbol}), {obj}] {msg}"
 
 pylint-tests:
@@ -47,8 +49,10 @@ pylint-tests:
 		--disable=bad-continuation \
 		--disable=duplicate-code \
 		--disable=no-self-use \
+		--argument-rgx="[a-z_][a-z0-9_]{1,30}" \
 		--exclude-protected=_libudev \
 		--no-docstring-rgx=_.* \
+		--variable-rgx="[a-z_][a-z0-9_]{1,30}" \
 		--msg-template="{path}:{line}: [{msg_id}({symbol}), {obj}] {msg}"
 
 diff-quality: