This project is the implementation of a few sequences from the OEIS.
To install it, run: pip install oeis.
oeis can be used from command line as:
$ oeis --help
usage: oeis [-h] [--list] [--start START] [--stop STOP] [--plot] [--random] [--file] [--dark-plot] [sequence]
Print a sweet sequence
positional arguments:
sequence Define the sequence to run (e.g.: A181391)
optional arguments:
-h, --help show this help message and exit
--list List implemented series
--start START Define the starting point of the sequence.
--stop STOP End point of the sequence (excluded).
--plot Print a sweet sweet sweet graph
--random Pick a random sequence
--file Generates a png of the sequence's plot
--dark-plot Print a dark dark dark graphNeed a specific sequence?
$ oeis A000108
# A000108
Catalan numbers: C(n) = binomial(2n,n)/(n+1) = (2n)!/(n!(n+1)!).
Also called Segner numbers.
[1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845, 35357670, 129644790, 477638700, 1767263190]Lazy? Pick one by random:
$ oeis --random
# A000045
Fibonacci numbers: F(n) = F(n-1) + F(n-2) with F(0) = 0 and F(1) = 1.
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181]
Want to see something cool?
$ oeis A133058 --plot --stop 1200
The oeis module expose sequences as Python Sequences:
>>> from oeis import A000045
>>> print(*A000045[:10], sep=", ")
1, 1, 2, 3, 5, 8, 13, 21, 34, 55
>>> A000045[0] == A000045[1]
True
>>> A000045[100:101]
[573147844013817084101]We are using the [black]((https://github.com/psf/black) coding style,
and tox to run some tests, so after creating a venv, installing
dev requirements via pip install requirements-dev.txt, run tox or
tox -p auto (parallel), it should look like this:
$ tox -p auto
✔ OK mypy in 11.807 seconds
✔ OK flake8 in 12.024 seconds
✔ OK black in 12.302 seconds
✔ OK py36 in 13.776 seconds
✔ OK py37 in 15.344 seconds
✔ OK py38 in 21.041 seconds
______________________________________ summary ________________________________________
py36: commands succeeded
py37: commands succeeded
py38: commands succeeded
flake8: commands succeeded
mypy: commands succeeded
black: commands succeeded
congratulations :)