Lazy Evaluation
Iterators evaluate elements on demand rather than computing everything upfront. This is critical when working with large files, network streams, or infinite sequences.
Python
Intermediate
4 min read
Lazy Evaluation with Iterators
Example
def read_large_file(path):
with open(path) as f:
for line in f:
yield line.strip()
for line in read_large_file("huge.log"):
process(line) # one line in memory at a time Pro Tip
File objects are already iterators in Python — iterating them is memory-efficient by default.