求解答新手入门不会写

Question

 

Answer 1

f = open('aa.txt', 'r')
t = f.read()
r = []
print(t)
for i in t:
    if 64 < ord(i) < 91:
        r.append(i.lower())
    elif 96 < ord(i) < 122:
        r.append(i.upper())
    else:
        r.append(i)
f.close()
print('转换结果：', ''.join(r))