Bump pip in yapf_virtual_environment
diff --git a/tools/distrib/yapf_code.sh b/tools/distrib/yapf_code.sh
index 919e9c1..27c5e31 100755
--- a/tools/distrib/yapf_code.sh
+++ b/tools/distrib/yapf_code.sh
@@ -30,11 +30,11 @@
VIRTUALENV=yapf_virtual_environment
-virtualenv $VIRTUALENV
-PYTHON=$(realpath "${VIRTUALENV}/bin/python")
-$PYTHON -m pip install --upgrade pip==9.0.2
-$PYTHON -m pip install --upgrade futures
-$PYTHON -m pip install yapf==0.20.0
+python -m virtualenv $VIRTUALENV
+PYTHON=${VIRTUALENV}/bin/python
+"$PYTHON" -m pip install --upgrade pip==10.0.1
+"$PYTHON" -m pip install --upgrade futures
+"$PYTHON" -m pip install yapf==0.20.0
yapf() {
local exclusion exclusion_args=()