Use with open() to ensure the file gets close()d

`process_data()`is an undefined name in this context
2017-09-19 21:08:59 +08:00
parent 71a80a8f42
commit 05ca48e02e
1 changed files with 3 additions and 4 deletions
--- a/cookbook/c04/p16_iterate_while.py
+++ b/cookbook/c04/p16_iterate_while.py
@@ -22,11 +22,10 @@ def reader2(s, size):

 def iterate_while():
    CHUNKSIZE = 8192
-    f = open('/etc/passwd')
-    for chunk in iter(lambda: f.read(10), ''):
-        n = sys.stdout.write(chunk)
+    with open('/etc/passwd') as f:
+        for chunk in iter(lambda: f.read(10), ''):
+            n = sys.stdout.write(chunk)


 if __name__ == '__main__':
    iterate_while()
-