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CodingBat code practice lab2 > count_codons
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Given strings x and s, where s has length 3, count the occurrences of s as a substring of x, starting at an index which is a multiple of 3. (Hint: the range() function can take three arguments, try range(0,10,3).)

count_codons('agctagctagctagctagcta', 'agc') → 2
count_codons('agctagctagctagctagcta', 'cta') → 2
count_codons('agcagcagcagc', 'agc') → 4

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def count_codons(x, s):

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Difficulty: 200

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