# greeting

Nice to meet you, this is cells_comp.
I, who was a ROM specialist, started Qiita at midnight.
I'm sorry that the first article to commemorate is such a bad article, but I would like to post what I came up with for the time being.

# What I tried

If you want to randomly sort the elements of list (l) in Python, think straightforwardly

--Sort by random.shuffle (l)
--Sort by l2 = random.sample (l, len (l))
--Correctly, "random acquisition of the specified number from the list without duplication" is performed.
--The specified number = all elements, so the result is a shuffled list.

I think that will come out. By the way, which of these two methods is faster?
You may hear a voice saying ** Use numpy if you want to say speed **, but please forgive me.

# Execution environment

Python 3.5.5
Intel® Core™ i7-6700 3.4GHz
Windows10 (WSL)
Ubuntu 16.04 LTS

# Execution result

### In the case of random.shuffle

The target list contains integers.

```
import random
import time
if __name__ == '__main__':
l = [i for i in range(1000000)]
start = time.time()
random.shuffle(l)
elapsed_time = time.time() - start
print("elapsed_time:" + str(format(elapsed_time)) + "s")
```

result

```
elapsed_time:0.6656289100646973s
```

### For random.sample

```
import random
import time
if __name__ == '__main__':
l = [i for i in range(1000000)]
start = time.time()
l2 = random.sample(l,len(l))
elapsed_time = time.time() - start
print("elapsed_time:" + str(format(elapsed_time)) + "s")
```

result

```
elapsed_time:0.7895145416259766s
```

Yes, random.shuffle () is about 20% faster.
After all, it is not optimal because it is originally a function for random extraction.

### bonus

```
import random
import time
import numpy
if __name__ == '__main__':
l = [i for i in range(1000000)]
start = time.time()
numpy.random.shuffle(l)
elapsed_time = time.time() - start
print("elapsed_time:" + str(format(elapsed_time)) + "s")
```

result

```
elapsed_time:0.1087648868560791s
```

***the end! Closed! that's all! Everyone disbanded! *** ***

# in conclusion

Yes, this is my first post.
I was so scared that I didn't post it until now, but when I try it, it's easy.
It's a self-satisfying post, but I hope it helps even one person.
I would like to continue posting in a timely manner.
Well then, thank you for your cooperation.