Arvore de Natal em Caracteres Python

from random import choice
print('{:.>40}'.format('FELIZ NATAL'))
print('{:.^40}'.format('FELIZ NATAL'))
print('{:.<40}'.format('FELIZ NATAL'))

for n in range(10):
    a = n+1
    n = str(n)
    n = ['M' * a]

    arvore = choice(n)
    print('{:.^40}'.format(arvore))
for z in range(4):
    tronco = '#' * 2
    print('{:.^40}'.format(tronco))

print('{:^>40}'.format(''))
print('{:^>40}'.format(''))
print('{:^>40}'.format(''))