petl-developers / petl / 42975762139

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Build Type

push

github

Committed by web-flow

Commit Message

Handle mixed-type variable names in recast (#807)

`recast()` uses native sorting when discovering output field names, so
valid mixed-type variable values raise `TypeError` before a header can
be emitted. This also breaks a `melt()`/`recast()` round trip for a
table containing an integer year column and a string forecast column:

```python
import petl as etl

table = [('id', 2024, 'forecast'), ('A', 10, 20)]
list(etl.recast(etl.melt(table, key='id'), key='id'))
# TypeError: '<' not supported between instances of 'str' and 'int'
```

PETL's table contract permits non-string header values. The resulting
table should retain the year and forecast columns and their original
values.

Co-authored-by: Claude Code <noreply@anthropic.com>
Co-authored-by: Juarez Rudsatz <juarezr@gmail.com>

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