[tools] Add generate_subways.sh script

Signed-off-by: Konstantin Pastbin <konstantin.pastbin@gmail.com>

tools/unix/helper_python.sh

@@ -0,0 +1,16 @@
+PYTHON="${PYTHON:-python3}"
+
+function activate_venv_at_path() {
+  path=$1
+
+  if [ ! -d "$path/".venv ]; then
+    "$PYTHON" -m venv "$path"/.venv
+  fi
+
+  source "$path"/.venv/bin/activate
+
+  if [ -f "$path"/requirements.txt ]; then
+    pip install --upgrade pip
+    pip install -r "$path"/requirements.txt
+  fi
+}