diff --git a/setuptools/command/bdist_egg.py b/setuptools/command/bdist_egg.py
index 73476e0cec..6cfd2ce86f 100644
--- a/setuptools/command/bdist_egg.py
+++ b/setuptools/command/bdist_egg.py
@@ -290,9 +290,11 @@ def get_ext_outputs(self):
 
         paths = {self.bdist_dir: ''}
         for base, dirs, files in sorted_walk(self.bdist_dir):
-            for filename in files:
-                if os.path.splitext(filename)[1].lower() in NATIVE_EXTENSIONS:
-                    all_outputs.append(paths[base] + filename)
+            all_outputs.extend(
+                paths[base] + filename
+                for filename in files
+                if os.path.splitext(filename)[1].lower() in NATIVE_EXTENSIONS
+            )
             for filename in dirs:
                 paths[os.path.join(base, filename)] = paths[base] + filename + '/'
 
diff --git a/setuptools/command/easy_install.py b/setuptools/command/easy_install.py
index 5ec5080131..801a7df768 100644
--- a/setuptools/command/easy_install.py
+++ b/setuptools/command/easy_install.py
@@ -1203,10 +1203,11 @@ def build_and_install(self, setup_script, setup_base):
 
             self.run_setup(setup_script, setup_base, args)
             all_eggs = Environment([dist_dir])
-            eggs = []
-            for key in all_eggs:
-                for dist in all_eggs[key]:
-                    eggs.append(self.install_egg(dist.location, setup_base))
+            eggs = [
+                self.install_egg(dist.location, setup_base)
+                for key in all_eggs
+                for dist in all_eggs[key]
+            ]
             if not eggs and not self.dry_run:
                 log.warn("No eggs found in %s (setup script problem?)", dist_dir)
             return eggs