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Question 11 of 65

Part 2: Python Core Language, Internals & Runtime (6 - 25)

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Python & FastAPI•Part 2: Python Core Language, Internals & Runtime (6 - 25)

Generators and the `yield` keyword:

In Simple Words: A generator produces values on demand one at a time using yield instead of returning an entire collection at once, achieving $O(1)$ memory consumption.

python
def read_large_file(file_path):
    with open(file_path, 'r') as f:
        for line in f:
            yield line.strip() # Memory-efficient lazy evaluation

# Reads gigabytes of logs without running out of RAM:
for log_entry in read_large_file("huge_log.txt"):
    if "ERROR" in log_entry:
        print(log_entry)
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The Iterator Protocol: