diff --git a/src/util.py b/src/util.py
new file mode 100644
--- /dev/null
+++ b/src/util.py
@@ -0,0 +1,13 @@
+def progress(i, n, i0=0):
+	def _progress(i,n,i0):
+		return 100*(i+1-i0)//(n-i0)
+
+	if n<i0:
+		i*=-1
+		n*=-1
+		i0*=-1
+	assert i0<=i<n
+	percentage=_progress(i,n,i0)
+	if percentage>_progress(i-1,n,i0):
+		print(r"{0}%".format(percentage),end="")
+		if percentage==100: print()