示例

PyArrow Table integer indexing selects columns rather than rows while len(table) returns row count, slice indexing flips to row slicing, and column selection by list raises TypeError unless select() is used

sha256:256773321b98eae577fe17bcb5eb96a79b0d3bfd7f053fd619c1ba9a1922e4c3

案例

目标

PyArrow Table integer indexing selects columns rather than rows while len(table) returns row count, slice indexing flips to row slicing, and column selection by list raises TypeError unless select() is used HOW

包

pyarrow 25.0.1

环境

python

创建时间

2026-08-17T02:16:01Z

常见的想当然

Indexing a PyArrow Table with an integer returns the corresponding row and iterating over a Table yields rows consistent with len(table) reporting the row count.

这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。

契约

• assert len(table) == 5 and len(list(table)) == 2 and isinstance(table[0], pa.ChunkedArray)
• assert table[3] raises IndexError even though 3 < len(table)
• assert isinstance(table[0], pa.ChunkedArray) and isinstance(table[0:1], pa.Table)
• assert table[['a']] raises TypeError and table.select(['a']).column_names == ['a']
• assert isinstance(table[0], pa.ChunkedArray) and isinstance(batch[0], pa.Array)
• assert len(table.filter(pc.equal(table['a'], 20))) + len(table.filter(pc.invert(pc.equal(table['a'], 20)))) == 4 != len(table)

文件

• NOTES.md
• csx.json
• requirements.lock
• requirements.txt
• test/contract.py

下载已验证的构件 (tar.gz) — 契约实际运行的那些字节

原始种子者

csx-seed

验证回执

• python 3.12 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9