擅长:python、mysql、java
<p>有很多方法可以做到这一点。以下是其中之一</p>
<pre class="lang-py prettyprint-override"><code>from collections import Counter
protein = "MSRSLLLRFLLFLLLLPPLP"
aminos = ['M', 'L']
# Count occurrences of all characters
amino_counter = Counter(protein)
total_count = 0
# Only consider the counts of aminos that matter
for amino in aminos:
total_count += amino_counter.get(amino, 0)
print(total_count)
</code></pre>