Repository: pandas-dev/pandas
File: pandas/core/arrays/_arrow_string_mixins.py (Python)

Code before:
            )

        func = pc.replace_substring_regex if regex else pc.replace_substring
        # https://github.com/apache/arrow/issues/39149
        # GH 56404, unexpected behavior with negative max_replacements with pyarrow.
        pa_max_replacements = None if n < 0 else n
        result = func(
            self._pa_array,
            pattern=pat,
            replacement=repl,
            max_replacements=pa_max_replacements,
        )
        return self._from_pyarrow_array(result)

    def _str_capitalize(self) -> Self:
        return self._from_pyarrow_array(pc.utf8_capitalize(self._pa_array))

    def _str_title(self) -> Self:
        return self._from_pyarrow_array(pc.utf8_title(self._pa_array))

    def _str_swapcase(self) -> Self:
        return self._from_pyarrow_array(pc.utf8_swapcase(self._pa_array))

    def _str_removeprefix(self, prefix: str):
        if prefix == "":
            return self.copy()
        starts_with = pc.starts_with(self._pa_array, pattern=prefix)
        removed = pc.utf8_slice_codeunits(self._pa_array, len(prefix))
        result = pc.if_else(starts_with, removed, self._pa_array)
        return self._from_pyarrow_array(result)

    def _str_removesuffix(self, suffix: str):
        if suffix == "":
            return self.copy()
        ends_with = pc.ends_with(self._pa_array, pattern=suffix)
        removed = pc.utf8_slice_codeunits(self._pa_array, 0, stop=-len(suffix))
        result = pc.if_else(ends_with, removed, self._pa_array)
        return self._from_pyarrow_array(result)

    def _str_startswith(
        self, pat: str | tuple[str, ...], na: Scalar | lib.NoDefault = lib.no_default
    ):
        if isinstance(pat, str):
            result = pc.starts_with(self._pa_array, pattern=pat)
        else:
            if len(pat) == 0:
                # For empty tuple we return null for missing values and False
                #  for valid values.
                result = pc.if_else(pc.is_null(self._pa_array), None, False)
            else:
                result = pc.starts_with(self._pa_array, pattern=pat[0])

Review comment (suggestion):
```suggestion
            return self._from_pyarrow_array(self._pa_array)
```

Code after:
            )

        func = pc.replace_substring_regex if regex else pc.replace_substring
        # https://github.com/apache/arrow/issues/39149
        # GH 56404, unexpected behavior with negative max_replacements with pyarrow.
        pa_max_replacements = None if n < 0 else n
        result = func(
            self._pa_array,
            pattern=pat,
            replacement=repl,
            max_replacements=pa_max_replacements,
        )
        return self._from_pyarrow_array(result)

    def _str_capitalize(self) -> Self:
        return self._from_pyarrow_array(pc.utf8_capitalize(self._pa_array))

    def _str_title(self) -> Self:
        return self._from_pyarrow_array(pc.utf8_title(self._pa_array))

    def _str_swapcase(self) -> Self:
        return self._from_pyarrow_array(pc.utf8_swapcase(self._pa_array))

    def _str_removeprefix(self, prefix: str):
        if prefix == "":
            return self._from_pyarrow_array(self._pa_array)
        starts_with = pc.starts_with(self._pa_array, pattern=prefix)
        removed = pc.utf8_slice_codeunits(self._pa_array, len(prefix))
        result = pc.if_else(starts_with, removed, self._pa_array)
        return self._from_pyarrow_array(result)

    def _str_removesuffix(self, suffix: str):
        if suffix == "":
            return self._from_pyarrow_array(self._pa_array)
        ends_with = pc.ends_with(self._pa_array, pattern=suffix)
        removed = pc.utf8_slice_codeunits(self._pa_array, 0, stop=-len(suffix))
        result = pc.if_else(ends_with, removed, self._pa_array)
        return self._from_pyarrow_array(result)

    def _str_startswith(
        self, pat: str | tuple[str, ...], na: Scalar | lib.NoDefault = lib.no_default
    ):
        if isinstance(pat, str):
            result = pc.starts_with(self._pa_array, pattern=pat)
        else:
            if len(pat) == 0:
                # For empty tuple we return null for missing values and False
                #  for valid values.
                result = pc.if_else(pc.is_null(self._pa_array), None, False)
            else:
                result = pc.starts_with(self._pa_array, pattern=pat[0])