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ERR: clarify PerformanceWarning for fragmented frame #42942

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Aug 9, 2021
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4 changes: 2 additions & 2 deletions pandas/core/internals/managers.py
Original file line number Diff line number Diff line change
Expand Up @@ -1178,8 +1178,8 @@ def insert(self, loc: int, item: Hashable, value: ArrayLike) -> None:
warnings.warn(
"DataFrame is highly fragmented. This is usually the result "
"of calling `frame.insert` many times, which has poor performance. "
"Consider using pd.concat instead. To get a de-fragmented frame, "
"use `newframe = frame.copy()`",
"Consider joining all columns at once using pd.concat(axis=1) "
"instead. To get a de-fragmented frame, use `newframe = frame.copy()`",
PerformanceWarning,
stacklevel=5,
)
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