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Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
Suppose dna is a string variable that contains only 'a','c','g' or 't' characters. What Python code below can we use to find the frequency (max_freq) of the most frequent character in string dna?
A
- dna_counts=
- {'t':dna.count('t'),'c':dna.count('c'),'g':dna.count('g'),'a':dna.count('a')}
- max_freq=sorted(dna_counts.keys())[0]
- dna_counts=
- {'t':dna.count('t'),'c':dna.count('c'),'g':dna.count('g'),'a':dna.count('a')}
- max_freq=sorted(dna_counts.values())[-1]
C
- dna_counts=
- {'t':dna.count('t'),'c':dna.count('c'),'g':dna.count('g'),'a':dna.count('a')}
- max_freq=sorted(dna_counts.keys())[-1]
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