Ранее я уже упоминал о другой фишке из ˍˍfutureˍˍ , это оператор деления.
from __future__ import division
Суть проста. Раньше сложность типа данных результата поределялась типом самого сложного операнда.
Например:
int/int => int
int/float => float
В первом случае оба операнда int, значит и результат будет int. Во втором float более сложный тип, поэтому результат будет float.
Если нам требуется получить дробное значение при делении двух int то приходилось форсированно один из операндов конверировать в float.
12/float(5) => float
Но с новой "философией" это не требуется. В Python3 "floor division" заменили на "true division" а старый способ теперь работает через оператор "//".
>>> 3/2
1.5
>>> 3//2
1
То есть теперь деление int на int даёт float если результат не целое число.
В классах теперь доступны методы __floordiv__() и __truediv__() для определения поведения с этими операторами.
Данный переход описан в PEP238.
#pep#2to3#basic
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🪐 The cosmic microwave background, a faint glow that bathes the entire universe, carries subtle imprints called "acoustic peaks"—tiny wiggles in its temperature pattern, mapped by observatories like Planck. These acoustic peaks reveal the sound waves that rippled through the hot, dense plasma of the early universe, showing how matter and energy once "rang" together before the first atoms even formed. ✨
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🪐 In 2003, NASA's Wilkinson Microwave Anisotropy Probe (WMAP) created an all-sky map showing subtle temperature differences in the cosmic microwave background, the afterglow of the Big Bang. WMAP’s high-resolution data revealed a puzzling "cold spot" in the direction of the Eridanus constellation, a region cooler than expected that could hint at some of the universe’s deepest cosmic mysteries—such as massive voids or unusual early-universe physics. ✨
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🪐 The cosmic microwave background—an ancient light left over from the Big Bang—contains a hidden signal: tiny patterns of polarization, or the way its waves are oriented. These "B-modes," discovered in part by the BICEP2 telescope at the South Pole, are faint twists in the light that could provide direct evidence of gravitational waves rippling through the early universe, opening a window into its very first moments. ✨
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