STY: use `with open` when possible

1 files changed, 3 insertions, 7 deletions

diff --git a/doc/postprocess.py b/doc/postprocess.py
index b6d067437..e4cbecf7b 100755
--- a/doc/postprocess.py
+++ b/doc/postprocess.py
@@ -23,18 +23,14 @@ def main():
         p.error('unknown mode %s' % mode)
 
     for fn in args:
-        f = io.open(fn, 'r', encoding="utf-8")
-        try:
+        with io.open(fn, 'r', encoding="utf-8") as f:
             if mode == 'html':
                 lines = process_html(fn, f.readlines())
             elif mode == 'tex':
                 lines = process_tex(f.readlines())
-        finally:
-            f.close()
 
-        f = io.open(fn, 'w', encoding="utf-8")
-        f.write("".join(lines))
-        f.close()
+        with io.open(fn, 'w', encoding="utf-8") as f:
+            f.write("".join(lines))
 
 def process_html(fn, lines):
     return lines