为什么这个python代码不起作用？

Question

phrase = "Más vale pájaro en mano..."

# Agregá tu ciclo for
for car in phrase:
    if car == 'A' or 'a':
        print 'X'
    else:
        print car

我想替换所有＆＃39; A＆＃39;和＆＃39; a＆＃39;对于＆＃39; X＆＃39;