1 files changed, 5 insertions, 2 deletions
diff --git a/tools/format.py b/tools/format.py
index 0dc100b9f..5956432dc 100755
--- a/tools/format.py
+++ b/tools/format.py
@@ -2,6 +2,7 @@
 # Copyright 2018 the Deno authors. All rights reserved. MIT license.
 from glob import glob
 import os
+import sys
 from third_party import third_party_path, fix_symlinks, google_env, clang_format_path
 from util import root_path, run, find_exts, platform
 
@@ -26,8 +27,10 @@ for fn in ["BUILD.gn", ".gn"] + find_exts("build_extra", ".gn", ".gni"):
 #     'third_party/v8/tools/clang', which contains many .py files.
 #   * These third party python files shouldn't be formatted.
 #   * The tools directory has no subdirectories, so `glob()` is sufficient.
-# TODO(ry) Install yapf in third_party.
-run(["yapf", "-i"] + glob("tools/*.py") + find_exts("build_extra", ".py"))
+
+run([sys.executable, "third_party/yapf/yapf", "-i"] + glob("tools/*.py") +
+    find_exts("build_extra", ".py"),
+    merge_env={"PYTHONPATH": "third_party/yapf"})
 
 # yapf: disable
 run(["node", prettier, "--write"] +