🔶 Python: Generators
A generator yields values one at a time instead of storing everything in memory.
# List = all in memory at once
squares = [x**2 for x in range(10_000_000)] # ~80MB
# Generator = computes one at a time
squares = (x**2 for x in range(10_000_000)) # ~120 bytesCustom generator with yield:
def read_large_file(path):
with open(path) as f:
for line in f:
yield line.strip() # One line at a time
for line in read_large_file('huge.csv'):
process(line) # Never loads entire filePractice Questions
Q: What's the difference between
[x for x in range(n)] and (x for x in range(n))?