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factorization is always useful to have

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This commit is contained in:
Stefan Harmuth 2022-04-19 09:15:49 +02:00
parent f700f0cb32
commit 04c6357f9c
1 changed files with 11 additions and 0 deletions
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11
tools/math.py
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@ -1,3 +1,4 @@
import math
from decimal import Decimal, ROUND_HALF_UP from decimal import Decimal, ROUND_HALF_UP
from .types import Numeric from .types import Numeric
@ -5,3 +6,13 @@ from .types import Numeric
def round_half_up(number: Numeric) -> int: def round_half_up(number: Numeric) -> int:
""" pythons round() rounds .5 to the *even* number; 0.5 == 0 """ """ pythons round() rounds .5 to the *even* number; 0.5 == 0 """
return int(Decimal(number).to_integral(ROUND_HALF_UP)) return int(Decimal(number).to_integral(ROUND_HALF_UP))
def get_factors(num: int) -> set:
f = {num}
for x in range(1, int(math.sqrt(num)) + 1):
if num % x == 0:
f.add(x)
f.add(num // x)
return f