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Suppose I have an arbitrary iterable – for example, a generator that iterates over lines of a file and yields the ones matching a regex.
How can I count the number of items in that iterable, supposing that I don’t care about the elements themselves?
Calls to
itertools.imap()in Python 2 ormap()in Python 3 can be replaced by equivalent generator expressions:This also uses a lazy generator, so it avoids materializing a full list of all iterator elements in memory.