擅长:python、mysql、java
<p>请尝试以下代码:</p>
<pre class="lang-py prettyprint-override"><code>def choosecolours():
colourletters = ["g","b","r","m","o","c"]
colourlist = list()
while len(colourlist) < 3:
colour = input("First choose a colour by entering the first letter of the colour you like: ")
if colour in colourletters:
colourlist.append(colour)
else:
print("Enter a valid letter!")
return colourlist
output = choosecolours()
print(output)
</code></pre>
<p>如果要使用外部函数中的变量,可以将指向该函数的变量指针作为参数。你知道吗</p>