CODEWITHSUNDEEP
pythonpython-3.x
James
James

Reputation: 387

timeit faster than it should be

I'm running a test with timeit and am not understanding what is going on. I've been evaluating 2 raised to a power but every time it says it takes 0.02 ± 0.01 seconds. What am I doing wrong?

Example:

This will take 2.5 mins to execute:

2**10000000

This will return instantly with something like 0.01637562597170472:

timeit.Timer(stmt="2**10000000").timeit()

Upvotes: 2

Views: 88

Answers (2)

Sraw
Sraw

Reputation: 20224

Additional supplement of @Ryan, If you try a = 2 ** 10000000, it will return immediately. But then if you try print(a), it takes such a long time to execute.

As @Ryan has said, this long time is cost by converting to decimal string. As timeit.Timer(stmt="2**10000000").timeit() won't print anything, it returns also immediately.

Upvotes: -1

Ry-
Ry-

Reputation: 225115

2**10000000

This doesn’t take 2.5 minutes to execute. It takes 2.5 minutes to convert to a decimal string, which is how integers are printed by default. Try (2**10000000) % 10000000 or len(hex(2**10000000)).

Upvotes: 4

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