Reverse complement of DNA strand using Python

reverse_complement.py

alt_map = {'ins':'0'}
complement = {'A': 'T', 'C': 'G', 'G': 'C', 'T': 'A'} 

def reverse_complement(seq):    
    for k,v in alt_map.iteritems():
        seq = seq.replace(k,v)
    bases = list(seq) 
    bases = reversed([complement.get(base,base) for base in bases])
    bases = ''.join(bases)
    for k,v in alt_map.iteritems():
        bases = bases.replace(v,k)
    return bases
  
  
>>> seq = "TCGGinsGCCC"
>>> print "Reverse Complement:"
>>> print(reverse_complement(seq))
GGGCinsCCGA

https://www.bioinformatics.org/sms/rev_comp.html