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Sat, 10 Oct 2020 09:55:10 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-112-182.ams2.redhat.com [10.36.112.182]) by smtp.corp.redhat.com (Postfix) with ESMTPS id CCE1D6EF58; Sat, 10 Oct 2020 09:55:09 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 0116111275CA; Sat, 10 Oct 2020 11:55:05 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PULL 28/34] qapi/gen.py: update write() to be more idiomatic Date: Sat, 10 Oct 2020 11:54:58 +0200 Message-Id: <20201010095504.796182-29-armbru@redhat.com> In-Reply-To: <20201010095504.796182-1-armbru@redhat.com> References: <20201010095504.796182-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/10 02:57:53 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, John Snow , Eduardo Habkost , Cleber Rosa Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: John Snow 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 Reviewed-by: Eduardo Habkost Reviewed-by: Cleber Rosa Reviewed-by: Markus Armbruster Message-Id: <20201009161558.107041-31-jsnow@redhat.com> Signed-off-by: Markus Armbruster --- 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 8b851c6262..670c21e210 100644 --- a/scripts/qapi/gen.py +++ b/scripts/qapi/gen.py @@ -12,7 +12,6 @@ # See the COPYING file in the top-level directory. from contextlib import contextmanager -import errno import os import re from typing import ( @@ -65,21 +64,19 @@ class QAPIGen: 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) + + # 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: