fix bug in example (should close file at all times)

Doc/lib/libimp.tex

@@ -158,7 +158,7 @@ def __import__(name, globals=None, locals=None, fromlist=None):
     fp, pathname, (suffix, mode, type) = imp.find_module(name)
 
     # See what we got.
-    # Note that fp will be closed automatically when we return.
+    try:
         if type == imp.C_EXTENSION:
             return imp.load_dynamic(name, pathname)
         if type == imp.PY_SOURCE:
@@ -168,4 +168,7 @@ def __import__(name, globals=None, locals=None, fromlist=None):
 
         # Shouldn't get here at all.
         raise ImportError, '%s: unknown module type (%d)' % (name, type)
+    finally:
+        # Since we may exit via an exception, close fp explicitly.
+        fp.close()
 \end{verbatim}

Doc/libimp.tex

@@ -158,7 +158,7 @@ def __import__(name, globals=None, locals=None, fromlist=None):
     fp, pathname, (suffix, mode, type) = imp.find_module(name)
 
     # See what we got.
-    # Note that fp will be closed automatically when we return.
+    try:
         if type == imp.C_EXTENSION:
             return imp.load_dynamic(name, pathname)
         if type == imp.PY_SOURCE:
@@ -168,4 +168,7 @@ def __import__(name, globals=None, locals=None, fromlist=None):
 
         # Shouldn't get here at all.
         raise ImportError, '%s: unknown module type (%d)' % (name, type)
+    finally:
+        # Since we may exit via an exception, close fp explicitly.
+        fp.close()
 \end{verbatim}