-2
def fun(p,q,x=x):
p=p*x^0
q=q*x^0
t=diff(q)
u=p.degree(x)+1
s=p.degree(x)-t.degree(x)
o=s+1
if s<0:
print('The integral does not undertake in elementary functions')
else:
if s==0:
A=var('A0')
else:
A=var(['A%d' %n for n in range(o)])
r=sum([A[i]*(x^i) for i in range(o)])
h=diff(r,x)+r*diff(q,x)-p
l=diff(r,x)+r*diff(q,x)
B=([l.coefficient(x,n) for n in range(u)])
C=([p.coefficient(x,n) for n in range(u)])
if o==1:
t=solve((B[u-1]-C[u-1]==0),r)
r=r.subs(t)
print(r)
else:
z=[h.subs(x=n)==0 for n in range(u)]
t=solve(z,A)
l=len(t[0])
if t[0][l-1]!=0:
r=r.subs(t)
print(r)
else:
print('The integral does not undertake in elementary functions')
fun(x,x**2)不起作用。 如果我會嘗試fun(x**2,x)它會工作。或fun(x,x**3)。在分配之前參考的局部變量'B'
File 「」, line 1, in File 「」, line 21, in dr UnboundLocalError: local variable ‘B’ referenced before assignment
有人可以修好嗎？我嘗試了我能想象的一切。