Introduction to BioPython's Seq objects.

biopython-sequence.py

from Bio.Seq import Seq

# Create sequence object
my_sequence = Seq("AGTACACTGGT")

# Show the sequence object
print("Sequence:", my_sequence)

# The sequence was created with a generic alphabet.
# The alphabet tells us whether it is a DNA, RNA or 
# protein sequence and whether it is ambiguous or not.
print("Alphabet:", my_sequence.alphabet)

# We can easily get the complement
complement = my_sequence.complement()
print("Complement:", complement)

# Same with the reverse complement
rev_complement = my_sequence.reverse_complement()
print("Reverse complement:", rev_complement)