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new example: ctypes #441

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Nov 16, 2023
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new example: ctypes #441

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c9a04f7
new example: ctypes
liquidcarbon Nov 7, 2023
f01ab55
Update examples/ctypes-factorial/pixi.toml
liquidcarbon Nov 7, 2023
1ff2674
pixi run start and win-64 implementation
liquidcarbon Nov 12, 2023
2eb359e
add osx
liquidcarbon Nov 13, 2023
9b58a78
test on a mac and update pixi.lock
liquidcarbon Nov 15, 2023
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6 changes: 6 additions & 0 deletions examples/ctypes-factorial/.gitignore
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# pixi environments
.pixi

# shared objects
**/*.dll
**/*.so
25 changes: 25 additions & 0 deletions examples/ctypes-factorial/README.md
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# Ctypes example: large factorials

This examples calculates approximate factorials of large numbers using pure Python or Python with ctypes.


## Features demonstrated:
- packaging C and Python libraries together
- compiling with gcc through Pixi tasks
- conditional Pixi task execution (`depends_on`)
- defining tasks with arguments


## Output

C implementation used in Python via ctypes was about 5x faster than pure python on the author's machine. How fast was your setup?

```
$ pixi run factorial 12345678 python
2023-11-06@18:49:19.296216|INFO|__main__.<module>:50|calculating approximate factorial of 12345678 using pure Python...
2023-11-06@18:49:23.992089|INFO|__main__.<module>:61|12345678! ≈ 1.457260e82187904

$ pixi run factorial 12345678 ctypes
2023-11-06@18:49:29.404679|INFO|__main__.<module>:53|calculating factorial of 12345678 using ctypes...
2023-11-06@18:49:29.947188|INFO|__main__.<module>:61|12345678! ≈ 1.457260e82187904
```
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