revert black changes

Author: harupy

src/pip/_internal/operations/install/legacy.py

@@ -37,7 +37,7 @@ def prepend_root(path: str) -> str:
 
     for line in record_lines:
         directory = os.path.dirname(line)
-        if directory.endswith(".egg-info"):
+        if directory.endswith('.egg-info'):
             egg_info_dir = prepend_root(directory)
             break
     else:
@@ -56,9 +56,9 @@ def prepend_root(path: str) -> str:
         new_lines.append(os.path.relpath(prepend_root(filename), egg_info_dir))
     new_lines.sort()
     ensure_dir(egg_info_dir)
-    inst_files_path = os.path.join(egg_info_dir, "installed-files.txt")
-    with open(inst_files_path, "w") as f:
-        f.write("\n".join(new_lines) + "\n")
+    inst_files_path = os.path.join(egg_info_dir, 'installed-files.txt')
+    with open(inst_files_path, 'w') as f:
+        f.write('\n'.join(new_lines) + '\n')
 
 
 def install(
@@ -82,7 +82,7 @@ def install(
 
     with TempDirectory(kind="record") as temp_dir:
         try:
-            record_filename = os.path.join(temp_dir.path, "install-record.txt")
+            record_filename = os.path.join(temp_dir.path, 'install-record.txt')
             install_args = make_setuptools_install_args(
                 setup_py_path,
                 global_options=global_options,
@@ -107,7 +107,7 @@ def install(
                 )
 
             if not os.path.exists(record_filename):
-                logger.debug("Record file %s not found", record_filename)
+                logger.debug('Record file %s not found', record_filename)
                 # Signal to the caller that we didn't install the new package
                 return False