code sample for pandas-dev#42549

Author: simonjayhawkins

bisect/42549.py

@@ -0,0 +1,22 @@
+# BUG: list-like objects are broadcast to each row (1.3 regression) #42549
+
+import pandas as pd
+
+print(pd.__version__)
+
+
+class MySequence:
+    def __getitem__(self, key):
+        return range(3)[key]
+
+    def __len__(self):
+        return 3
+
+
+my_sequence = MySequence()
+
+result = pd.DataFrame(index=range(3), data={"a": my_sequence})
+print(result)
+
+expected = pd.DataFrame(index=range(3), data={"a": range(3)})
+pd.testing.assert_frame_equal(result, expected)