胰蛋白酶消化(卵裂)不使用正则表达。

I have trying to code the theoretical tryptic cleavage of protein sequences in Python. The cleavage rule for trypsin is: after R or K, but not before P. (i.e. the trypsin cleaves (cuts) the protein sequence after each K or R, unless (K or R) is followed by a P).I have trying to code the theoretical tryptic c