[Python-Dev] Currently baking idea for dict.sequpdate(iterable, value=True)

[Raymond Hettinger]

Fix typos in the use cases section:
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# Fast Membership testing
termwords = {}.sequpdate('End Quit Stop Abort'.split())
 . . .
if lexeme in termwords: sys.exit(0) 

# Removing duplicates
seq = {}.sequpdate(seq).keys()

# Initializing or resetting value accumulators
absences = {}.sequpdate('Tom Dick Harry'.split())
for name, date in classlog:
    absences[name] += 1   # Intentionally raises KeyError for invalid names