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Compute tax-scale bracket index and marginal rate #920

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Dec 31, 2019
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Compute tax-scale bracket index and marginal rate #920

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002aa4c
Compute tax-scale bracket index and marginal rate
benjello Dec 24, 2019
0961423
Improve taxscale method descriptions
Dec 27, 2019
01129f1
Normailise docstrings
Dec 28, 2019
25878a3
Normalise indentations
Dec 28, 2019
9e623e2
Prefer f-strings for interpolation
Dec 28, 2019
8334f0f
Add typing to taxscales.py
Dec 28, 2019
f9c28fb
Do not import * in test_tax_scales.py
Dec 30, 2019
0425d74
Split tax scale tests by class
Dec 30, 2019
8a92cd9
Fix import order
Dec 30, 2019
eb7d145
Add edge test scenarios
Dec 30, 2019
46df613
Fix bracket indices test when rounding decimals
benjello Dec 31, 2019
ff6bbd5
Remove trivial inf in #bracket_indices
Dec 31, 2019
3823a3a
Expect errors on empty brackets and tax base
Dec 31, 2019
cfb43c4
Refactor error handling
Dec 31, 2019
1d4a413
Bump version and changelog
Dec 31, 2019
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41 changes: 41 additions & 0 deletions CHANGELOG.md
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@@ -1,5 +1,46 @@
# Changelog

## 34.6.0 [#920](https://github.com/openfisca/openfisca-core/pull/920)

#### New features

- Introduce `AbstractTaxRateScale.bracket_indices`.
- Introduce `MarginalTaxScale.marginal_rates`.
- Details:
- This new methods allow users to:
- Compute the bracket indices relevant for any tax base.
- Compute the marginal rates relevant for any tax base.

#### Usage notes

1. To use `AbstractTaxRateScale.bracket_indices`:

```py
from numpy import array

from openfisca_core.taxscales import AbstractRateTaxScale

tax_scale = AbstractRateTaxScale()
tax_scale.add_bracket(0, 0)
tax_scale.add_bracket(100, 0.1)
tax_base = array([0, 150])
tax_scale.bracket_indices(tax_base) # [0, 1]
```

2. To use `MarginalTaxScale.marginal_rates`:

```py
from numpy import array

from openfisca_core.taxscales import MarginalRateTaxScale

tax_scale = MarginalRateTaxScale()
tax_scale.add_bracket(0, 0)
tax_scale.add_bracket(100, 0.1)
tax_base = array([0, 150])
tax_scale.marginal_rates(tax_base) # [0.0, 0.1]
```

### 34.5.4 [#919](https://github.com/openfisca/openfisca-core/pull/919)

#### Technical change
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