擅长:python、mysql、java
<p>您没有指定<code>mlist</code>和<code>plist</code>列表的结构,但我怀疑您应该<code>print(plist[value], x)</code>而不是{<cd4>}:</p>
<pre><code>interval = input("Enter the range: ") # example "1990-2019"
bounds = interval.split("-")
for x in range(bounds[0], bounds[1]):
if x in mlist:
value = mlist.index(x) #mlist is the list which has years of the books
print (plist[value], x) #plist is the list of books' names
</code></pre>