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new 012fd17fa5 GH-49108: [Python] SparseCOOTensor.__repr__ missing
f-string prefix (#49109)
012fd17fa5 is described below
commit 012fd17fa5dc77f94c95bac8bfbedd91349f3df9
Author: ChiLin Chiu <[email protected]>
AuthorDate: Mon Feb 2 20:21:20 2026 +0800
GH-49108: [Python] SparseCOOTensor.__repr__ missing f-string prefix (#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}
```
* GitHub Issue: #49108
Authored-by: Chilin <[email protected]>
Signed-off-by: Raúl Cumplido <[email protected]>
---
python/pyarrow/tensor.pxi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/python/pyarrow/tensor.pxi b/python/pyarrow/tensor.pxi
index 73715c0609..cad09cb7ba 100644
--- a/python/pyarrow/tensor.pxi
+++ b/python/pyarrow/tensor.pxi
@@ -359,7 +359,7 @@ cdef class SparseCOOTensor(_Weakrefable):
self.type = pyarrow_wrap_data_type(self.stp.type())
def __repr__(self):
- return """<pyarrow.SparseCOOTensor>
+ return f"""<pyarrow.SparseCOOTensor>
type: {self.type}
shape: {self.shape}"""
