擅长:python、mysql、java
<p>另一种方法是简单地创建一个名为<code>IAPWS_1995</code>的模块,因为您实际上并没有实例化类中的对象。你的模块看起来像:</p>
<pre><code>n_0, n_1, n_2, n_3 = ...
d_0, d_1, d_2 = ...
t_0, t_1, t_2 = ...
c_1, = ...
b_3, = ...
alpha_2, beta_2, gamma_2, epsilon_2 = ...
dpsi_ddelta = ...
dDeltab_ddelta = ...
def dAr_ddelta(delta, tau, Delta, theta, psi):
_dAr_ddelta = (
sum(n_0 * d_0 * pow(delta, d_0-1) * pow(tau, t_0)) +
sum(n_1 * exp(-pow(delta, c_1)) * (pow(delta, d_1-1) * pow(tau, t_1) * (d_1 - c_1*pow(delta, c_1)))) +
sum(n_2 * pow(delta, d_2)*pow(tau, t_2) * exp(-alpha_2*(delta-epsilon_2)**2 - beta_2*(tau-gamma_2)**2) * (d_2/delta - 2*alpha_2*(delta-epsilon_2))) + \
sum(n_3 * (pow(Delta, b_3)*(psi + delta*dpsi_ddelta(psi, delta)) + dDeltab_ddelta(delta, Delta, theta)*delta*psi)))
return _dAr_ddelta
</code></pre>
<p>常量作为模块级变量,类方法是模块级函数。在</p>
<p>其他代码可以这样使用它:</p>
^{pr2}$