zip_22_square1

# list comprehension to square each number in a LARGE list of 100,000 numbers

rands = [random.randrange(1, 100, 1) for i in range(100000)]

t = time.perf_counter()
# >>>>>>>>>>>>>>>>>>>>>>>>
rands2 = []
for n in rands:
    n = n**2
    rands2.append(n)
# >>>>>>>>>>>>>>>>>>>>>>>>
tLoop = time.perf_counter() - t
print(f'{tLoop:.3f} sec')


t = time.perf_counter()
# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
_ = [n**2 for n in rands]
# >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
tComp = time.perf_counter() - t
print(f'{tComp:.3f} sec: comprehension vs loop: {100*(tComp/tLoop-1):.1f}%')