Add underscore as a separator in a binary number in Python

user_12442886 0
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I a trying to convert a decimal number into a 17-bit binary number and add underscore as a separator in it. I am using the following code -

id = 18
get_bin = lambda x, n: format(x, 'b').zfill(n)
bin_num = get_bin(id, 17)

The output I am getting is in the form of -

00000000000010010

I am trying to get the following output -

0_0000_0000_0001_0010

How can I get it?

separator numbers python-3.x binary python
3 Answers
user_147397590

One way:

import textwrap
result = '_'.join(textwrap.wrap(bin_num[::-1], 4))[::-1]

output:

'0_0000_0000_0001_0010'
user_154380330

You need to add the _ to the format string, and also you don't need to use zfill - 017_b formats to a minimum length of 17 characters, zero filling the space, and using _ in between.

print(format(18, '021_b')) 

gives

0_0000_0000_0001_0010

Also note in binary mode, the underscores are always every 4 digits as you require there. More

user_130455080
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