Use ABCMultiindex to assert type of index

Marco Gorelli · Marco Gorelli · commit ad0da03ffdd6 · 2019-08-29T17:18:30.000+01:00
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
@@ -6248,7 +6248,7 @@ 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
`@@ -6248,7 +6248,7 @@ def explode(self, column: Union[str, Tuple]) -> "DataFrame":`
`6248`	`6248`	`exploded_col = frame.pop(column).reset_index(drop=True).explode()`
`6249`	`6249`	`result = frame.reset_index().join(exploded_col)`
`6250`	`6250`
`6251`		`- if isinstance(self.index, MultiIndex):`
	`6251`	`+ if isinstance(self.index, ABCMultiIndex):`
`6252`	`6252`	`result.index = pandas.MultiIndex.from_frame(`
`6253`	`6253`	`result.iloc[:, : self.index.nlevels]`
`6254`	`6254`	`)`