Why IPython is much faster than python?

Asked Jul 28 '17 at 05:13

Active Jul 28 '17 at 05:31

Viewed 1,049 times

import numpy as np
import time

xyz = np.random.rand(3,2399,2399)
t1 = time.time()
a = []
for _ in range(10):
    a.append((xyz/np.linalg.norm(xyz, axis=0)-np.array([0,0,1])[:,np.newaxis,np.newaxis])/3)
t2 = time.time()
print(t2-t1)

This is my code. Python 3 run this code in 21.24s while IPython just use 12.6s. What magic does IPython do?

Python 3.6.1

IPython 5.3.0

asked Jul 28 '17 at 05:13

Shen Zhou

https://stackoverflow.com/questions/12370457/what-is-the-difference-between-python-and-ipython – Moyote Jul 28 '17 at 05:24
more info about differences: https://www.quora.com/What-is-the-difference-between-IPython-and-Python – Moyote Jul 28 '17 at 05:25
1

I can't reproduce it with Python 3.4.3: same execution time with or without IPython. Are you using some version of Python 2 when running your code outside of IPython? – Thierry Lathuille Jul 28 '17 at 05:25
1

@Moyote As those links say, the IPython is just a python shell. I think there should not be any difference in performance. – Shen Zhou Jul 28 '17 at 05:31
@ThierryLathuille No, I use python 3, actually, they all comes from anaconda. – Shen Zhou Jul 28 '17 at 05:32
Anaconda includes numpy with MKL, which can speed up calculations on arrays. Try `np.__config__.show()` and see if it's different between the two. – roganjosh Jul 28 '17 at 05:52
IPython is just a shell. How, exactly, are you running these tests? – juanpa.arrivillaga Jul 28 '17 at 06:18
python3 script.py and ipython3 script.py – Shen Zhou Jul 28 '17 at 06:36

Why IPython is much faster than python?

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