chilin0525 opened a new pull request, #49109:
URL: https://github.com/apache/arrow/pull/49109
### Rationale for this change
`SparseCOOTensor.__repr__` outputs literal `{self.type}` and `{self.shape}`
instead of actual values due to missing f-string prefix.
### What changes are included in this PR?
Add f prefix to the string in `SparseCOOTensor.__repr__`.
### Are these changes tested?
Yes, work after adding. f-string prefix:
```python3
>>> import pyarrow as pa
>>> import numpy as np
>>> dense_tensor = np.array([[0, 1, 0], [2, 0, 3]], dtype=np.float32)
>>> sparse_coo = pa.SparseCOOTensor.from_dense_numpy(dense_tensor)
>>> sparse_coo
<pyarrow.SparseCOOTensor>
type: float
shape: (2, 3)
```
### Are there any user-facing changes?
a bug that caused incorrect or invalid data to be produced:
```python3
>>> import pyarrow as pa
>>> import numpy as np
>>> dense_tensor = np.array([[0, 1, 0], [2, 0, 3]], dtype=np.float32)
>>> sparse_coo = pa.SparseCOOTensor.from_dense_numpy(dense_tensor)
>>> sparse_coo
<pyarrow.SparseCOOTensor>
type: {self.type}
shape: {self.shape}
```
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