擅长:python、mysql、java
<p>备选办法:</p>
<pre class="lang-py prettyprint-override"><code>def is_balanced(string):
if len(string)<1:
return False
unique_letters = set(string)
n_occurances = 0
for letter in unique_letters:
n_occurances_this = string.count(letter)
if n_occurances == 0:
n_occurances = n_occurances_this
elif n_occurances_this != n_occurances:
return False
return True
</code></pre>
<p>此代码在字符串中创建一组字符(唯一列表),并检查每个字符的出现次数</p>