擅长:python、mysql、java
<p>最简单的是<a href="https://docs.python.org/2/library/collections.html#collections.Counter" rel="nofollow noreferrer">^{<cd1>}</a>。然后您可以对其项目进行排序:</p>
<pre><code>>>> from collections import Counter
>>> c = Counter(s)
>>> for char, num in sorted(c.items()):
... print(repr(char), num)
' ' 25
'"' 2
"'" 2
',' 1
'.' 2
'1' 1
'4' 1
'A' 1
'I' 1
'T' 1
'a' 13
'b' 4
'c' 1
# ...
</code></pre>