[test] Travis: enforce Python 3.4 support in functional tests

Make lint/check-doc.py Python 3.4 compatible.

Also add .python-version for pyenv which will cause tests with too
modern syntax to fail on developer machine rather than on Travis.

1 files changed, 6 insertions, 2 deletions

diff --git a/test/lint/check-doc.py b/test/lint/check-doc.py
index b0d9f87958..4facd6c334 100755
--- a/test/lint/check-doc.py
+++ b/test/lint/check-doc.py
@@ -26,8 +26,12 @@ SET_DOC_OPTIONAL = set(['-h', '-help', '-dbcrashratio', '-forcecompactdb'])
 
 
 def main():
-    used = check_output(CMD_GREP_ARGS, shell=True, universal_newlines=True, encoding='utf8')
-    docd = check_output(CMD_GREP_DOCS, shell=True, universal_newlines=True, encoding='utf8')
+    if sys.version_info >= (3, 6):
+        used = check_output(CMD_GREP_ARGS, shell=True, universal_newlines=True, encoding='utf8')
+        docd = check_output(CMD_GREP_DOCS, shell=True, universal_newlines=True, encoding='utf8')
+    else:
+        used = check_output(CMD_GREP_ARGS, shell=True, universal_newlines=True) # encoding='utf8'
+        docd = check_output(CMD_GREP_DOCS, shell=True, universal_newlines=True) # encoding='utf8'
 
     args_used = set(re.findall(re.compile(REGEX_ARG), used))
     args_docd = set(re.findall(re.compile(REGEX_DOC), docd)).union(SET_DOC_OPTIONAL)