Given a DNA sequence, say DNA = ‘AATTGGCCA’, count how many times a given nucleotide (e.g. ‘A’) appears.
I used to do this in Python:
>>>DNA = 'AATTGGCCA' >>> len(filter(lambda x: x=='A',DNA)) 3
Today, I just find out I can simply do:
>>> DNA.count('A') 3
Feel silly myself, but begin to love Python even more!