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EHN: fix unsigned int type problem of the result diff() #31916

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EHN: fix unsigned int type problem of the result diff() #31916

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2 changes: 2 additions & 0 deletions pandas/core/algorithms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1869,6 +1869,7 @@ def diff(arr, n: int, axis: int = 0, stacklevel=3):

is_timedelta = False
is_bool = False
original_dtype = np.dtype(dtype)
if needs_i8_conversion(arr):
dtype = np.float64
arr = arr.view("i8")
Expand Down Expand Up @@ -1928,6 +1929,7 @@ def diff(arr, n: int, axis: int = 0, stacklevel=3):
if is_timedelta:
out_arr = out_arr.astype("int64").view("timedelta64[ns]")

out_arr = out_arr.astype(original_dtype)
return out_arr


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