diff --git a/go/abstract_factory/main.go b/go/abstract_factory/main.go
new file mode 100644
index 0000000..06ab7d0
--- /dev/null
+++ b/go/abstract_factory/main.go
@@ -0,0 +1 @@
+package main
diff --git a/go/go.mod b/go/go.mod
new file mode 100644
index 0000000..a6d9968
--- /dev/null
+++ b/go/go.mod
@@ -0,0 +1,3 @@
+module ivistang.tech/design-patterns
+
+go 1.25.0
diff --git a/python/.python-version b/python/.python-version
new file mode 100644
index 0000000..24ee5b1
--- /dev/null
+++ b/python/.python-version
@@ -0,0 +1 @@
+3.13
diff --git a/python/pyproject.toml b/python/pyproject.toml
new file mode 100644
index 0000000..0721873
--- /dev/null
+++ b/python/pyproject.toml
@@ -0,0 +1,7 @@
+[project]
+name = "design-patterns"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.13"
+dependencies = []