Python Forum

Hi,
i have the following code:

import random


def newlist(x):
    y = []
    for i in x:
        if i not in y:
            y.append(i)
    return y


a = []

for i_nd in range(0, 1000):
    n = random.randint(0, 100)
    a.append(n)


print(newlist(a))

and for some reason, even though i indicated in for i_nd in range(0, 1000): a range from 0 to 1000 - it only gives me 100 numbers....(when what i want is 1,000 numbers in the range from 0 to 100)

do you know what can it be ?

It is not possible to have 1000 unique numbers in the range from 0 to 100.

It is because the call to newlist() removes duplicates.

You have a list of 1000 random numbers, before you pass that list to your function. Your function is then striping out all the duplicates, which leaves all the numbers from 0 to 100.

If you put in y.sort() before the return, you see what I mean:

def newlist(x):
    y = []
    for i in x:
        if i not in y:
            y.append(i)
    y.sort()
    return y

You shufle 20 decks of standard playing cards. You remove all the duplicate cards so there are only one of each. How many cards remain?

Do you see how this relates to your question?

yea i know (one deck),

but the thing is i do want duplicates...
okay here i fixed it...

import random


def newlist(x):
    y = []
    for i in x:
        y.append(i)
    y.sort()
    return y


a = []

for i_nd in range(0, 1000):
    n = random.randint(0, 100)
    a.append(n)

print(len(a))
print(newlist(a))

thank you everyone

---

heyy where did my last message went ?

okay i'll write it again,

i have the current code:

import random
from collections import Counter


def newlist(x):
    y = []
    for i in x:
        y.append(i)
    y.sort()
    return y


a = []

for i_nd in range(0, 1000):
    n = random.randint(0, 100)
    a.append(n)

b = a
b.sort()

my_List = dict(Counter(b))

print(my_List)

print(len(a))
print(newlist(a))

Output:
{0: 7, 1: 14, 2: 6, 3: 13, 4: 7, 5: 10, 6: 4, 7: 11, 8: 12, 9: 7, 10: 14, 11: 9, 12: 7, 13: 7, 14: 8, 15: 11, 16: 4, 17: 6, 18: 16, 19: 10, 20: 7, 21: 16, 22: 7, 23: 6, 24: 9, 25: 7, 26: 11, 27: 12, 28: 9, 29: 10, 30: 12, 31: 4, 32: 8, 33: 7, 34: 11, 35: 9, 36: 8, 37: 17, 38: 7, 39: 11, 40: 7, 41: 9, 42: 12, 43: 11, 44: 10, 45: 13, 46: 12, 47: 11, 48: 15, 49: 16, 50: 12, 51: 7, 52: 10, 53: 13, 54: 18, 55: 5, 56: 7, 57: 7, 58: 7, 59: 11, 60: 11, 61: 8, 62: 14, 63: 9, 64: 16, 65: 4, 66: 8, 67: 12, 68: 11, 69: 17, 70: 11, 71: 12, 72: 6, 73: 9, 74: 10, 75: 11, 76: 7, 77: 11, 78: 12, 79: 4, 80: 9, 81: 9, 82: 5, 83: 16, 84: 12, 85: 15, 86: 12, 87: 7, 88: 13, 89: 8, 90: 13, 91: 15, 92: 14, 93: 8, 94: 6, 95: 16, 96: 7, 97: 7, 98: 11, 99: 6, 100: 4}

now, suppose i want to order the output so the order of the numbers will be by their prevalence...and not by the numeric order as it is at the moment...

what shall be done ?

Read the Counter documentation

I'm struggling to understand why you have so much code.

What does your code do, that this stripped down version does not do (sorting, aside)?

import random
from collections import Counter

a = []  # holds a list of 1000 numbers; 0 to 100


for i_nd in range(0, 1000):
    n = random.randint(0, 100)
    a.append(n)

number_dict = dict(Counter(a)) # renamed

yea (rob101), you're right, i stripped it down as well, no need for the function above...

Dean - i read the documentation on python.org, not much there,
anyway - i read/searched some more info on other sites but haven't found something useful...

It can be reduced to

import random
from collections import Counter

counter = Counter(random.randint(0, 100) for _ in range(1000))
print(counter.most_common())

Output:
[(54, 18), (64, 18), (74, 16), (1, 16), (89, 15), (96, 15), (37, 14), (55, 14), (30, 13), (63, 13), (99, 13), (3, 13), (24, 13), (4, 13), (12, 12), (46, 12), (47, 12), (22, 12), (65, 12), (13, 12), (52, 12), (88, 12), (10, 12), (21, 12), (18, 12), (0, 12), (23, 12), (90, 12), (41, 11), (82, 11), (50, 11), (81, 11), (83, 11), (92, 11), (5, 11), (51, 11), (95, 11), (40, 11), (97, 11), (68, 11), (16, 11), (2, 11), (62, 11), (73, 11), (60, 11), (98, 11), (9, 11), (67, 10), (36, 10), (43, 10), (100, 10), (15, 10), (61, 10), (86, 10), (11, 10), (38, 10), (93, 9), (84, 9), (48, 9), (7, 9), (49, 9), (35, 9), (77, 9), (8, 9), (34, 9), (56, 9), (94, 9), (42, 9), (58, 8), (28, 8), (31, 8), (78, 8), (32, 8), (29, 8), (87, 8), (6, 8), (44, 8), (33, 8), (25, 8), (75, 8), (14, 8), (70, 8), (39, 8), (66, 7), (72, 7), (20, 7), (26, 7), (69, 7), (59, 6), (53, 6), (27, 6), (19, 6), (91, 6), (80, 6), (85, 5), (71, 5), (45, 5), (79, 5), (17, 4), (76, 4), (57, 2)]