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@@ -719,7 +719,7 @@ def lazy_sort_index(df: pd.DataFrame, axis=0) -> pd.DataFrame:
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FLATTEN_TUPLE = "_FLATTEN_TUPLE"
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def flatten_dict(d, parent_key="", sep="."):
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def flatten_dict(d, parent_key="", sep=".") -> dict:
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"""
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Flatten a nested dict.
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