擅长:python、mysql、java
<p>将<code>N = N + 1</code>缩进循环之外,否则它永远无法添加</p>
<p>或者更好地使用<code>N += 1</code>:</p>
<pre><code>def shampoo_instructions(user_cycles):
N = 1
while N <= user_cycles:
if N < 1:
print('Too few')
elif N > 4:
print('Too many')
else:
print(N,': Lather and rinse.')
N = N + 1
print('Done.')
user_cycles = int(input())
shampoo_instructions(user_cycles)
</code></pre>