The following functions are all supposed to count how many times a certain base (represented as a character variable in Python) appears in a dna sequence (represented as a string variable in Python):def count1(dna, base): i = 0 for c in dna: if c == base: i += 1 return i def count2(dna, base): i = 0 for j in range(len(dna)): if dna[j] == base: i += 1 return i def count3(dna, base): match = [c == base for c in dna] return sum(match) def count4(dna, base): return dna.count(base) def count5(dna, base): return len([i for i in range(len(dna)) if dna[i] == base]) def count6(dna,base): return sum(c == base for c in dna)=======================================================================================Which of them is correct?count 3, and count 6 onlycount 1, count 3, and count 4 onlyAll of them are correct.count 1, count 3, count 4, and count 6 only

Answered: The following functions are all…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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The following functions are all supposed to count how many times a certain base (represented as a character variable in Python) appears in a dna sequence (represented as a string variable in Python):

def count1(dna, base):
i = 0
for c in dna:
if c == base:
i += 1
return i
def count2(dna, base):
i = 0
for j in range(len(dna)):
if dna[j] == base:
i += 1
return i
def count3(dna, base):
match = [c == base for c in dna]
return sum(match)
def count4(dna, base):
return dna.count(base)
def count5(dna, base):
return len([i for i in range(len(dna)) if dna[i] == base])
def count6(dna,base):
return sum(c == base for c in dna)

=======================================================================================

Which of them is correct?

count 3, and count 6 only
count 1, count 3, and count 4 only
All of them are correct.
count 1, count 3, count 4, and count 6 only

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