From 80107a8bb7ec0b8d490fb21dfaebdbf2e729d58f Mon Sep 17 00:00:00 2001
From: Shannon Shen <22512825+lolipopshock@users.noreply.github.com>
Date: Tue, 5 Apr 2022 16:39:04 -0400
Subject: [PATCH 1/2] fix #131

---
 src/layoutparser/visualization.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/layoutparser/visualization.py b/src/layoutparser/visualization.py
index 483ac3d..0d10abf 100644
--- a/src/layoutparser/visualization.py
+++ b/src/layoutparser/visualization.py
@@ -318,7 +318,7 @@ def draw_box(
         font_obj = _create_font_object(id_font_size, id_font_path)
 
     if box_alpha is None:
-        box_alpha = [0]
+        box_alpha = [0] * len(layout)
     else:
         if isinstance(box_alpha, (float, int)):
             box_alpha = [box_alpha] * len(layout)
@@ -363,6 +363,9 @@ def draw_box(
                 f"The number of colors {len(box_color)} is not equal to the number of blocks {len(layout)}"
             )
 
+    # A post check of the lengths of the input lists
+    assert len(layout) == len(box_color) == len(box_alpha) == len(box_width)
+
     for idx, (ele, color, alpha, width) in enumerate(
         zip(layout, box_color, box_alpha, box_width)
     ):

From 68c3a1c0db7e5809349b10dd95d6c3e67aa69a0d Mon Sep 17 00:00:00 2001
From: Shannon Shen <22512825+lolipopshock@users.noreply.github.com>
Date: Tue, 5 Apr 2022 16:54:15 -0400
Subject: [PATCH 2/2] more comments

---
 src/layoutparser/visualization.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/layoutparser/visualization.py b/src/layoutparser/visualization.py
index 0d10abf..002d063 100644
--- a/src/layoutparser/visualization.py
+++ b/src/layoutparser/visualization.py
@@ -364,6 +364,8 @@ def draw_box(
             )
 
     # A post check of the lengths of the input lists
+    # To support more versions of python, we do not use 
+    # zip(*, strict=True)
     assert len(layout) == len(box_color) == len(box_alpha) == len(box_width)
 
     for idx, (ele, color, alpha, width) in enumerate(