use dict.fromkeys

[mathause]

• [x] closes #23

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (25ee49e) 88.50% compared to head (a366910) 88.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #56 +/- ## ======================================= Coverage 88.50% 88.50% ======================================= Files 5 5 Lines 261 261 ======================================= Hits 231 231 Misses 30 30 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `88.50% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mathias+Hauser#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/mathause/filefinder/pull/56?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mathias+Hauser) | Coverage Δ | | |---|---|---| | [filefinder/\_filefinder.py](https://app.codecov.io/gh/mathause/filefinder/pull/56?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mathias+Hauser#diff-ZmlsZWZpbmRlci9fZmlsZWZpbmRlci5weQ==) | `80.00% <100.00%> (ø)` | |

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