Array values in binary

Question

I've written a script that gets n bit values and put them together in a list. I need to make the result in binary. It gives me errors in every single method/function I try. I'm fairly new to Python, I would appreciate some help.

from itertools import product
arr = 0
val_x = []
val_y =[]
n = int(input('n = '))

if __name__ == "__main__":

for x in range (0, n + 1):
    for y in range (0, n + 1):
        if y == 0:
            arr += 1
    if arr == 1:
        val_x.append(x)
        val_y.append(x)
    arr = 0

res = list(product(val_x, val_y))
print(res)

The result I get is:

n = 2
[(0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2), (2, 0), (2, 1), (2, 2)]

I need it in binary like this:

[(00, 00), (00, 01), (00, 10), (01, 00), (01, 01), (01, 10), (10, 00), (10, 01), (10, 10)]

Here is the post which you can refer, https://stackoverflow.com/q/10411085/4985099 — sushanth, Apr 28 '21 at 10:51

Nk03 · Accepted Answer · 2021-04-28T11:04:54.840

Using bin ->

from itertools import product
arr = 0
val_x = []
val_y =[]
n = int(input('n = '))

if __name__ == "__main__":

    for x in range(n + 1):
        for y in range(n + 1):
            if y == 0:
                arr += 1
        if arr == 1:
            val_x.append(bin(x)[2:]) #by bin you can convert the int to binary
            val_y.append(bin(x)[2:])
        arr = 0

res = list(product(val_x, val_y))
print(res)

Using f-strings(as suggested by ash)- Here, the idea is instead of appending integers append their binary format.

from itertools import product
arr = 0
val_x = []
val_y =[]
n = int(input('n = '))


if __name__ == "__main__":

    for x in range(n + 1):
        for y in range(n + 1):
            if y == 0:
                arr += 1
        if arr == 1:

            val_x.append(f"{x:02b}")
            val_y.append(f"{x:02b}")
        arr = 0

res = list(product(val_x, val_y))
print(res)

There isn't any explanation on here - I would add some for the benefit of our poster if you get time :) — Ash Oldershaw, Apr 28 '21 at 10:56

score 1 · Answer 2 · answered Apr 28 '21 at 10:53

the good news is that your binary is being stored correctly, you can do whatever you like to it - when you want to represent it as binary you can use string formatting with b get a binary string out.

>>> a = 5
>>> f"{a:b}"
'101'

If you want it to be a certain length (always 2 in your case) you can do this:

>>> a = 0
>>> f"{a:02b}"
'00'

Array values in binary

2 Answers2