擅长:python、mysql、java
<p>字典是这样一对值的理想对象:</p>
<pre><code>clues = dict()
while True:
letter = input("What letter would you like to add? ").upper()
if letter == "":
break
symbol = input("\nWhat symbol would you like to pair with ").upper()
if letter not in clues.keys() and symbol not in clues.values():
clues[letter]=symbol
else:
print("Letter or symbol already paired")
print(clues)
</code></pre>