How to calculate the fraction of a certain letter within a string?

Question

Hi I would like to know how I can calculate the fraction of certain letters in a string. Like for example if I have the string "ABGTACTGASDJASBFGJAFKA" and want to calculate the fraction of A+D in that string what would I have to do? I want to do this without having to import anything and only using the built in functions of python.

def fraction(string):

    A = ""

    D = ""

    A = string.count("A")

    D = string.count("D")

    print(int(A/D * 100), "%")

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Answer 1

A/D is not a the fraction of a certain letter in the whole sting.

The following line will calculate the percentage of "A" in your string.

100.0 * ( string.count("A") / len(string) )

My suggestion, don't do both characters at once. Start with this

def fraction(string, letter):

How to calculate the fraction of a certain letter within a string?

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