K4zuki · October 13, 2025 15:55
diff --git a/a_to_bin_str.py b/a_to_bin_str.py
 from math import ceil


 def a_to_bin_str(b: int):
    """ integer to binary string with 0b and 4-digits separation by '_'

    >>> a_to_bin_str(123)
    >>> '0b0111_1011'

    :param int b:
    :return str: formatted string
    """
    header_length = 2  # length of '0b'
    no_0b = len(bin(b)) - header_length

    underscores = no_0b // 4  # number of '_'
    ceil_length = 4 * ceil(no_0b / 4)  # round up to 4N digits
    format_str = "{{:#0{}_b}}".format(underscores + ceil_length + header_length)

    return format_str.format(b)
	from math import ceil


	def a_to_bin_str(b: int):
	""" integer to binary string with 0b and 4-digits separation by '_'

	>>> a_to_bin_str(123)
	>>> '0b0111_1011'

	:param int b:
	:return str: formatted string
	"""
	header_length = 2 # length of '0b'
	no_0b = len(bin(b)) - header_length

	underscores = no_0b // 4 # number of '_'
	ceil_length = 4 * ceil(no_0b / 4) # round up to 4N digits
	format_str = "{{:#0{}_b}}".format(underscores + ceil_length + header_length)

	return format_str.format(b)
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