basic support for length_hint

- fixes #1068
tqdm · Mar 5, 2021 · 4ff7753 · 4ff7753
1 parent 8830eb5
commit 4ff7753
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/tqdm/std.py b/tqdm/std.py
@@ -1125,6 +1125,8 @@ def __len__(self):
         return self.total if self.iterable is None else \
             (self.iterable.shape[0] if hasattr(self.iterable, "shape")
              else len(self.iterable) if hasattr(self.iterable, "__len__")
+             else self.iterable.__length_hint__()
+             if hasattr(self.iterable, "__length_hint__")
              else getattr(self, "total", None))
 
     def __enter__(self):