Solution: DNA sequencing with filter

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examples/lists/dna_sequencing_filter.py

dna = 'ACCGXXCXXGTTACTGGGCXTTGT'
sequences = dna.split('X')
sequences.sort(key=len, reverse=True)

def not_empty(x):
    return len(x) > 0

print(sequences)
sequences = list( filter(not_empty, sequences) )
print(sequences)