On 10/7/20 8:32 AM, Markus Armbruster wrote:
John Snow <js...@redhat.com> writes:
Make the file handling here just a tiny bit more idiomatic.
(I realize this is heavily subjective.)
Use exist_ok=True for os.makedirs and remove the exception,
use fdopen() to wrap the file descriptor in a File-like object,
and use a context manager for managing the file pointer.
Signed-off-by: John Snow <js...@redhat.com>
Reviewed-by: Eduardo Habkost <ehabk...@redhat.com>
Reviewed-by: Cleber Rosa <cr...@redhat.com>
---
scripts/qapi/gen.py | 25 +++++++++++--------------
1 file changed, 11 insertions(+), 14 deletions(-)
diff --git a/scripts/qapi/gen.py b/scripts/qapi/gen.py
index 3624162bb77..579ee283297 100644
--- a/scripts/qapi/gen.py
+++ b/scripts/qapi/gen.py
@@ -14,7 +14,6 @@
# See the COPYING file in the top-level directory.
from contextlib import contextmanager
-import errno
import os
import re
from typing import (
@@ -67,21 +66,19 @@ def write(self, output_dir: str) -> None:
return
pathname = os.path.join(output_dir, self.fname)
odir = os.path.dirname(pathname)
+
if odir:
- try:
- os.makedirs(odir)
- except os.error as e:
- if e.errno != errno.EEXIST:
- raise
+ os.makedirs(odir, exist_ok=True)
I wouldn't call this part "heavily subjective". When wrote the old
code, exist_ok was still off limits (it's new in 3.2).
It's cool if you agree, I just realize that what people consider
idiomatic is subjective unless it's enforcable by a tool. This isn't.
"I made this look more like if I wrote it, which caused Dopamine" is a
bad commit message. (But more true.)
+
+ # use os.open for O_CREAT to create and read a non-existant file
fd = os.open(pathname, os.O_RDWR | os.O_CREAT, 0o666)
- f = open(fd, 'r+', encoding='utf-8')
- text = self.get_content()
- oldtext = f.read(len(text) + 1)
- if text != oldtext:
- f.seek(0)
- f.truncate(0)
- f.write(text)
- f.close()
+ with os.fdopen(fd, 'r+', encoding='utf-8') as fp:
+ text = self.get_content()
+ oldtext = fp.read(len(text) + 1)
+ if text != oldtext:
+ fp.seek(0)
+ fp.truncate(0)
+ fp.write(text)
def _wrap_ifcond(ifcond: List[str], before: str, after: str) -> str:
Reviewed-by: Markus Armbruster <arm...@redhat.com>
Thanks, though :)
