From 6e4b48cfcb5663ef6a8a92d51b9c04ae41ff7d20 Mon Sep 17 00:00:00 2001
From: Casper da Costa-Luis <tqdm@caspersci.uk.to>
Date: Sun, 28 Jun 2020 21:12:31 +0100
Subject: [PATCH] gui: fix TypeError on unknown `len()`

- fixes #971
---
 tqdm/gui.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tqdm/gui.py b/tqdm/gui.py
index 35f5c5e5..73103d75 100644
--- a/tqdm/gui.py
+++ b/tqdm/gui.py
@@ -53,7 +53,7 @@ class tqdm_gui(std_tqdm):  # pragma: no cover
         self.mininterval = max(self.mininterval, 0.5)
         self.fig, ax = plt.subplots(figsize=(9, 2.2))
         # self.fig.subplots_adjust(bottom=0.2)
-        total = len(self)
+        total = self.__len__()  # avoids TypeError on None #971
         if total is not None:
             self.xdata = []
             self.ydata = []