import sympy as sp
from IPython.display import display
x,y=sp.var("x y")
E1=(x-2*y)**7
E2=x**4*y**3
display(E1)
print("この式を展開し")
display(E1)
print("の係数は")
display(sp.expand(E1).coeff(x,4).coeff(y,3))