qapi: Prefer single-quoted strings more consistently

PEP 8 advises:

    In Python, single-quoted strings and double-quoted strings are the
    same.  This PEP does not make a recommendation for this.  Pick a
    rule and stick to it.  When a string contains single or double
    quote characters, however, use the other one to avoid backslashes
    in the string.  It improves readability.

The QAPI generators succeed at picking a rule, but fail at sticking to
it.  Convert a bunch of double-quoted strings to single-quoted ones.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1489582656-31133-20-git-send-email-armbru@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 330b9f321b..3d3936e4d0 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -335,10 +335,10 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
 do_builtins = False
 
 (input_file, output_dir, do_c, do_h, prefix, opts) = \
-    parse_command_line("b", ["builtins"])
+    parse_command_line('b', ['builtins'])
 
 for o, a in opts:
-    if o in ("-b", "--builtins"):
+    if o in ('-b', '--builtins'):
         do_builtins = True
 
 c_comment = '''