Extract context manager for suppressing logs. Ref pypa/distutils#183.

setuptools/wheel.py

@@ -1,13 +1,14 @@
 """Wheels support."""
 
-from distutils.util import get_platform
-from distutils import log
 import email
 import itertools
 import os
 import posixpath
 import re
 import zipfile
+import contextlib
+
+from distutils.util import get_platform
 
 import pkg_resources
 import setuptools
@@ -50,6 +51,19 @@ def unpack(src_dir, dst_dir):
         os.rmdir(dirpath)
 
 
+@contextlib.contextmanager
+def disable_info_traces():
+    """
+    Temporarily disable info traces.
+    """
+    from distutils import log
+    saved = log.set_threshold(log.WARN)
+    try:
+        yield
+    finally:
+        log.set_threshold(saved)
+
+
 class Wheel:
 
     def __init__(self, filename):
@@ -156,17 +170,12 @@ def raw_req(req):
                 extras_require=extras_require,
             ),
         )
-        # Temporarily disable info traces.
-        log_threshold = log._global_log.threshold
-        log.set_threshold(log.WARN)
-        try:
+        with disable_info_traces():
             write_requirements(
                 setup_dist.get_command_obj('egg_info'),
                 None,
                 os.path.join(egg_info, 'requires.txt'),
             )
-        finally:
-            log.set_threshold(log_threshold)
 
     @staticmethod
     def _move_data_entries(destination_eggdir, dist_data):