I'd like to arrange it randomly from the Python list.

I'd like to save 100 random numbers between 1-100 on the list and print them out 10 per line.

For example,

77  82   5  13  91  85  43  22  23  90
.
.
.
33  12  95  35  21  34  68  51  53   9

In the middle...has been omitted for convenience. Anyway, I want to arrange the numbers between 1-100 at random by 10 x 10. I've been trying to fix the code, but I'm not sure. Here's the last code I wrote.

import random

mynum = []
for i in range(100):
    k = random.randint(1, 100)
    while True:
        k = random.randrange(1, 101)
        if k not in mynum:
            break
    mynum.append(k)

for i in range(len(mynum)):
    print("%3d"%i, end=' ')
    if i%10 == 9:
        print('\n')

I just started Python, so I'd appreciate it if you could explain it with basic functions as much as possible. Also, I want to know all the things that are wrong here.

python

2022-09-20 21:49

1 Answers

Good job. At the end, you can only change the part that shows the random numbers you collect as follows.

for i, n in enumerate(mynum):
    print("%3d"%n, end=' ')
    if i%10 == 9:
        print('\n')

In order not to pick what has already been picked again, the draw is repeated randomly again, and there is no problem with time when it is currently 100, but I think there may be a speed issue when it is a much larger number. If you say a million. When you have to pick one more, the last number is fixed, but in the code above, you randomly pick it again with a random function. So you have to repeat the one-in-a-millionth probability. You have to do it about a million times to pick the last number.

The way to improve it a little bit is to put the numbers that haven't been picked up in the set and pick them out one by one. In Python, there's also a function that if you're given a list or three, you pick one of them.

But the most efficient thing about this type of problem is to use what's called shuffle. Just mix the order like hwatu-pae. It is located in the random module.

>>> import random
>>> l = list(range(1, 101))
>>> l
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
>>> random.shuffle(l)
>>> l
[61, 77, 64, 3, 83, 22, 100, 98, 60, 47, 79, 9, 46, 97, 45, 56, 58, 30, 71, 37, 4, 86, 68, 67, 27, 72, 31, 17, 29, 16, 70, 65, 24, 99, 76, 50, 92, 12, 95, 2, 25, 21, 88, 39, 23, 1, 96, 8, 93, 33, 63, 91, 7, 32, 36, 87, 42, 14, 80, 34, 66, 10, 62, 85, 73, 74, 40, 6, 41, 48, 28, 13, 53, 52, 35, 57, 38, 89, 69, 43, 26, 81, 44, 19, 82, 18, 55, 90, 75, 54, 15, 49, 20, 11, 51, 84, 5, 59, 94, 78]
>>> for i in range(10):
    print(''.join(map(lambda n:'%3s '%n, l[10*i:10*(i+1)])))


 61  77  64   3  83  22 100  98  60  47 
 79   9  46  97  45  56  58  30  71  37 
  4  86  68  67  27  72  31  17  29  16 
 70  65  24  99  76  50  92  12  95   2 
 25  21  88  39  23   1  96   8  93  33 
 63  91   7  32  36  87  42  14  80  34 
 66  10  62  85  73  74  40   6  41  48 
 28  13  53  52  35  57  38  89  69  43 
 26  81  44  19  82  18  55  90  75  54 
 15  49  20  11  51  84   5  59  94  78

>>> l = list(range(1, 101))
>>> r = []
>>> random.choice(l)
37

>>> while l:
    c = random.choice(l) ##
    r.append(c) ## Put it in the list of results
    l.remove(c)## Delete from original list

>>> l
[]
>>> r
[65, 32, 15, 2, 45, 47, 11, 98, 97, 42, 36, 87, 40, 35, 55, 65, 12, 96, 74, 91, 48, 21, 54, 3, 1, 75, 16, 77, 82, 68, 67, 44, 51, 89, 90, 57, 20, 29, 85, 34, 63, 81, 27, 23, 28, 46, 49, 25, 66, 22, 69, 80, 70, 86, 59, 73, 19, 31, 71, 37, 62, 61, 72, 99, 60, 43, 84, 39, 52, 78, 17, 14, 64, 18, 13, 5, 4, 83, 93, 53, 92, 26, 33, 95, 76, 24, 30, 88, 56, 8, 9, 94, 58, 41, 50, 38, 6, 7, 100, 10, 79]
>>> for i in range(10):
    print(''.join(map(lambda n:'%3s '%n, r[10*i:10*(i+1)])))


 65  32  15   2  45  47  11  98  97  42 
 36  87  40  35  55  65  12  96  74  91 
 48  21  54   3   1  75  16  77  82  68 
 67  44  51  89  90  57  20  29  85  34 
 63  81  27  23  28  46  49  25  66  22 
 69  80  70  86  59  73  19  31  71  37 
 62  61  72  99  60  43  84  39  52  78 
 17  14  64  18  13   5   4  83  93  53 
 92  26  33  95  76  24  30  88  56   8 
  9  94  58  41  50  38   6   7 100  10

2022-09-20 21:49

If you have any answers or tips

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