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Kernel: Python 3 (system-wide)

Exercises 14.1

Loop through the following DNA sequence using range() and print each base.

dna_seq = 'ACGGATATATATATGCCCGTAATATATAGCG'

for i in range(len(dna_seq)):
    print(dna_seq[i])
A C G G A T A T A T A T A T G C C C G T A A T A T A T A G C G

Exercises 14.2

Modify your code so that it prints all quintuplets (5 consecutive bases) of dna_seq. For example, the first few quintuplets are "ACGGA", "CGGAT", "GGATA", etc.

  • Hint: This is slightly different to the example in Notebook 14 in which the step size was 3. Here we want a step size of 1.

dna_seq = 'ACGGATATATATATGCCCGTAATATATAGCG'

for i in range(len(dna_seq)):
    print(dna_seq[i:i+5])
ACGGA CGGAT GGATA GATAT ATATA TATAT ATATA TATAT ATATA TATAT ATATG TATGC ATGCC TGCCC GCCCG CCCGT CCGTA CGTAA GTAAT TAATA AATAT ATATA TATAT ATATA TATAG ATAGC TAGCG AGCG GCG CG G

Exercises 14.3

Modify your code so that it counts all occurrences of the quintuplet "TATAT".

count = 0

for i in range(len(dna_seq)):
    if dna_seq[i:i+5] == 'TATAT':
        
        count += 1
        
print(count)
4

Exercises 14.4

Use range() to calculate the sum of all the numbers in the following list. Print the sum.

arriving_penguins = [10, 156, 73, 376, 786, 432, 1035, 901, 1102, 2567, 1571, 916, 1560, 632, 943, 246, 654, 1456, 504, 632]

n = len(arriving_penguins)
sum = 0

for i in range(n):
    sum += arriving_penguins[i]
    
print(sum)
16552

Exercises 14.5

Use range() to simultaneously loop through the following two lists. Add each pair of numbers and print them.

x = [1.2, 12.3, -23.6]
y = [15.0, -5.4, 4.5]



for i in range(len(x)):
    sum = 0
    sum = x[i] + y[i]
    print(sum)
16.2 6.9 -19.1