Tag: python-internals
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Why list comprehensions create a function internally?
16 This is disassembly of a list comprehension in python 3.10: Python 3.10.12 (main, Jun 11 2023, 05:26:28) [GCC 11.4.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import dis >>> >>> dis.dis("[True for _ in ()]") 1 0 LOAD_CONST 0 (<code object <listcomp> at 0x7fea68e0dc60, file "<dis>", line 1>) 2…
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Why is b.pop(0) over 200 times slower than del b[0] for bytearray?
24 Letting them compete three times (a million pops/dels each time): from timeit import timeit for _ in range(3): t1 = timeit(‘b.pop(0)’, ‘b = bytearray(1000000)’) t2 = timeit(‘del b[0]’, ‘b = bytearray(1000000)’) print(t1 / t2) Time ratios (Try it online!): 274.6037053753368 219.38099365582403 252.08691226683823 Why is pop that much slower at doing the same thing? python…
