Include this file in your python interpreter (or scripts) so you can calculate physics problems without looking up the constants.

physconsts.py

#
# physconsts.py
# Scientific and Physical Constants
#
# This file can be included so that the constants can be used without always
# looking them up. This is mostly intended to be used in an interactive command
# line environment so that you can easily use the python interpreter as a calculator
# for physics problems. All are in SI.
#
# Author: James O'Brien 2019
#

# Speed of light
C = 299792458 # m / s

# Vacuum permittivity, permeability
E0 = 8.8541878e-12 # F / m
U0 = 1.256637062e-6 # H / m

# Planck's constant
H = 6.62607004e-34 # m^2 kg / s
HBAR = 1.0545718e-34 # m^2 kg / s

# Rydberg constant
R = 1.09677e7 # / m

# Electron charge, electron mass
QE = 1.6021765e-19 # C
ME = 9.10938356e-31 # kg

# Proton mass
MP = 1.6726219e-27 # kg

# Boltzmann constant
KB = 1.38064852e-23 # m^2 kg / s^2 / K

# Avagadro's number
NA = 6.0221409e23 # (dimensionless)

# Fine structure constant
A = 0.0072973525693 # (dimensionless)

# Gravitational constant (big G)
BIG_G = 6.67408e-11 # m^3 / kg / s^2

# Average gravitational acceleration on Earth (little g)
LITTLE_G = 9.807 # m / s