python - Accessing keys in dictionaries -

if wanted access keys in dictionary , check if sequences (atgc) key have "gc". how access keys check if contains string "gc"?

many thanks!

matches = [ k k in yourdictionary.keys() if 'gc' in k.lower() ] number_of_matches = len(matches) 

you regex or string.find ( returns -1 if not found ) or string.count -- if substring in string works , cleaner illustrate point. cast key lowercase , compared against lowercase string, case insensitive match.