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Pint モジュールを使った単位を含む数値の取り扱い

Astropy にも似たような機能があるが、 Pint という Python モジュールにも、 単位を含む数値を使った計算や単位の変換ができるようだ。

使い方の一例。

#!/usr/pkg/bin/python3.9

# Time-stamp: <2022/04/10 10:39:00 (CST) daisuke>

import pint

#
# units
#

ur       = pint.UnitRegistry ()
u_deg    = ur.degree
u_rad    = ur.radian
u_arcmin = ur.arcmin
u_arcsec = ur.arcsec
u_mas    = ur.mas
u_pc     = ur.pc
u_au     = ur.au
u_m      = ur.metre

# angle a

angle_a = 180.0 * u_deg
angle_a_rad = angle_a.to (u_rad)
print ("angle_a = %s = %s" % (angle_a, angle_a_rad) )

# angle b

angle_b        = 1.0 * u_deg
angle_b_deg    = angle_b.to (u_deg)
angle_b_arcmin = angle_b.to (u_arcmin)
angle_b_arcsec = angle_b.to (u_arcsec)
print ("angle_b = %s = %s = %s" % (angle_b, angle_b_arcmin, angle_b_arcsec) )

# distance to Sirius
parallax = 374.5 * u_mas
distance = 1.0 / parallax.to (u_arcsec) * u_pc * u_arcsec
print ("distance to Sirius = %s" % distance)
print ("                   = %s" % distance.to (u_au) )
print ("                   = %s" % distance.to (u_m) )

実行結果は以下の通り。

% ./pint_00.py
angle_a = 180.0 degree = 3.141592653589793 radian
angle_b = 1.0 degree = 60.0 arcminute = 3599.9999999999995 arcsecond
distance to Sirius = 2.67022696929239 parsec
                   = 550773.8484525508 astronomical_unit
                   = 8.239459496574611e+16 meter

fig_202204/unit_0.png
fig_202204/unit_1.png



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