用python语言12步求解纳维斯托克斯方程 importnumpyasnp importsympy fromsympyimportinit_printing init_printing(use_latex=True) x,nu,t=sympy.symbols('xnut') phi=sympy.exp(-(x-4*t)**2/(4*nu*(t+1)))+sympy.exp(-(x-4*t-2*np.pi)**2/(4*nu*(t+1))) phi phiprime=phi.diff(x)...