diff --git a/.gitignore b/.gitignore
index 9b68711..21d3f16 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,10 @@ build/
 dist/
 calculate_lib.egg-info/
 .pytest_cache
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..74205a6
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+pytest
+jinja2
+xattr
+lxml