Use ABCMultiindex to assert type of index

Marco Gorelli · MarcoGorelli · commit 82099b1f4fcb · 2019-09-03T08:18:46.000+01:00
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
@@ -6263,7 +6263,7 @@ def explode(self, column: Union[str, Tuple]) -> "DataFrame":
         exploded_col = frame.pop(column).reset_index(drop=True).explode()
         result = frame.reset_index().join(exploded_col)
 
-        if isinstance(self.index, MultiIndex):
+        if isinstance(self.index, ABCMultiIndex):
             result.index = pandas.MultiIndex.from_frame(
                 result.iloc[:, : self.index.nlevels]
             )

Original file line number	Diff line number	Diff line change
`@@ -6263,7 +6263,7 @@ def explode(self, column: Union[str, Tuple]) -> "DataFrame":`
`6263`	`6263`	`exploded_col = frame.pop(column).reset_index(drop=True).explode()`
`6264`	`6264`	`result = frame.reset_index().join(exploded_col)`
`6265`	`6265`
`6266`		`- if isinstance(self.index, MultiIndex):`
	`6266`	`+ if isinstance(self.index, ABCMultiIndex):`
`6267`	`6267`	`result.index = pandas.MultiIndex.from_frame(`
`6268`	`6268`	`result.iloc[:, : self.index.nlevels]`
`6269`	`6269`	`)`