常量# 与量子力学有关的常数(如hbar)。 class sympy.physics.quantum.constants.HBar[源代码]# Reduced Plank's constant in numerical and symbolic form [R755]. 实例 >>> from sympy.physics.quantum.constants import hbar >>> hbar.evalf() 1.05457162000000e-34 工具书类 [R755] (1,2) https://en.wikipedia.org/wiki/Planck_constant