### 8 releases

0.3.0 | Mar 31, 2021 |
---|---|

0.2.4 | Sep 15, 2020 |

0.1.4 | Jun 21, 2020 |

#**1650** in Algorithms

**774** downloads per month

Used in **2** crates
(via tokenizations)

**MIT**license

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# SeqDiff - Diff between two sequences for Rust and Python

Functions to get correspondence between two sequences like

, based on Myers' algorithm.`diff`

# Usage

## Python

`diff`

`diff`

`def` `diff``(``
``a``:` `Sequence``[``S``]``,` `b``:` `Sequence``[``T``]``,` `*``,` `key``:` `Optional``[``Callable``[``[``S``,` `T``]`, `bool``]``]` `=` `None`
`)`` ``->` `Tuple``[``List``[``Optional``[``int``]``]`, `List``[``Optional``[``int``]``]``]``:` `...`

Returns the correspondence between two sequences

and `a`

.
`b`

is a comparison function (if needed).`key`

`import` `seqdiff`
`a` `=` `[``1``,` `2``,` `3``]`
`b` `=` `[``1``,` `3``,` `4``]`
`a2b`, `b2a` `=` `seqdiff``.``diff``(``a``,` `b``)`
`assert` `all``(``a``[``i``]` `==` `b``[``j``]` `for` `i``,` `j` `in` `enumerate``(``a2b``)` `if` `j` `is` `not` `None``)`
`assert` `all``(``a``[``j``]` `==` `b``[``i``]` `for` `i``,` `j` `in` `enumerate``(``b2a``)` `if` `j` `is` `not` `None``)`
`print``(``a2b``)`
`print``(``b2a``)`

`[``0``,` `None``,` `1``]`
`[``0``,` `2``,` `None``]`

`print_diff`

`print_diff`

`def` `print_diff``(``
``a``:` `Sequence``[``S``]``,` `b``:` `Sequence``[``T``]``,` `*``,` `key``:` `Optional``[``Callable``[``[``S``,` `T``]`, `bool``]``]` `=` `None`
`)``:` `...`

Pretty print the diff between two sequences

and `a`

.`b`

is a comparison function (if needed).`key`

`import` `seqdiff`
`a` `=` `[``1``,` `2``,` `3``]`
`b` `=` `[``1``,` `3``,` `4``]`
`a2b`, `b2a` `=` `seqdiff``.``print_diff``(``a``,` `b``)`

The return value is a pair of tuples. The first tuple contains the index where the item from the first sequence appears in the 2nd sequence or

if the item doesn't appear in the 2nd sequence. The 2nd tuple is the same but listing the corresponding indexes for the 2nd sequence in the first sequence.`None`

## Rust

`use` seqdiff`;`
`let` `(`a2b`,` b2a`)` `=` `seqdiff``::`diff`(``&``[``1``,` `2``,` `3``]``,` `&``[``1``,` `3``]``)``;`
`assert_eq!``(`a2b`,` `vec!``[``Some``(``0``)``,` `None``,` `Some``(``1``)``]``)``;`
`assert_eq!``(`b2a`,` `vec!``[``Some``(``0``)``,` `Some``(``2``)``]``)``;`

See the doc for more info.

# Related

- tokenizations - Robust and Fast tokenizations alignment library for Rust and Python
- This library depends on
`seqdiff`

- This library depends on