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utils.py
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utils.py
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from datetime import datetime, timedelta
import numpy as np
from numpy import sqrt, abs, argmin
def factor(n):
"""
Calculates the integer factors of n. Code credit: https://rosettacode.org/wiki/Factors_of_an_integer#Python
Args:
n: integer to be factored.
Returns: A sorted list of the factors of n.
"""
factors = set()
for x in range(1, int(sqrt(n)) + 1):
if n % x == 0:
factors.add(x)
factors.add(n // x)
return sorted(factors)
def most_symmetric_integer_factorization(N):
"""
Calculates the "most symmetric" integer factorization of N. This is the closest two integer factors of N. If N is
a square number, the integer factorization is "symmetric" and (sqrt(N), sqrt(N)) is the most "symmetric"
factorization.
Args:
N: Integer
Returns: Tuple containing the two "most symmetric" integer factorization of N.
"""
factors = np.array(factor(N))
# Get in the index of the largest factor that is still smaller than sqrt(N).
i = argmin(abs(factors - sqrt(N)))
return factors[i], N // factors[i]
def closest_hour(ndt):
sdt = str(ndt.astype('datetime64[s]')) # string datetime
pdt = datetime.strptime(sdt, "%Y-%m-%dT%H:%M:%S") # python datetime
if pdt.minute >= 30:
pdt = pdt.replace(minute=0, second=0) + timedelta(hours=1)
else:
pdt = pdt.replace(minute=0, second=0)
return pdt
def pretty_time(t):
if t < 1e-6:
return "{:.3g} ns".format(t * 1e9)
elif 1e-6 <= t < 1e-3:
return "{:.3g} μs".format(t * 1e6)
elif 1e-3 <= t < 1:
return "{:.3g} ms".format(t * 1e3)
elif 1 <= t < 60:
return "{:.3g} s".format(t)
else:
return "{:.3g} mins".format(t / 60)
def pretty_filesize(num, suffix="B"):
"""
Code credit: https://stackoverflow.com/a/1094933
Args:
num:
suffix:
Returns:
"""
for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
if abs(num) < 1024.0:
return "%3.1f %s%s" % (num, unit, suffix)
num /= 1024.0
return "%.1f %s%s" % (num, 'Yi', suffix)