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"""Convert a Decimal Number to a Binary Number."""

def decimal_to_binary(num):

"""

Convert a Integer Decimal Number to a Binary Number as str.

>>> decimal_to_binary(0)

'0b0'

>>> decimal_to_binary(2)

'0b10'

>>> decimal_to_binary(7)

'0b111'

>>> decimal_to_binary(35)

'0b100011'

>>> # negatives work too

>>> decimal_to_binary(-2)

'-0b10'

>>> # other floats will error

>>> decimal_to_binary(16.16) # doctest: +ELLIPSIS

Traceback (most recent call last):

...

TypeError: 'float' object cannot be interpreted as an integer

>>> # strings will error as well

>>> decimal_to_binary('0xfffff') # doctest: +ELLIPSIS

Traceback (most recent call last):

...

TypeError: 'str' object cannot be interpreted as an integer

"""

if type(num) == float:

raise TypeError("'float' object cannot be interpreted as an integer")

if type(num) == str:

raise TypeError("'str' object cannot be interpreted as an integer")

if num == 0:

return "0b0"

negative = False

if num < 0:

negative = True

num = -num

binary = []

while num > 0:

binary.insert(0, num % 2)

num >>= 1

if negative:

return "-0b" + "".join(str(e) for e in binary)

return "0b" + "".join(str(e) for e in binary)

if __name__ == "__main__":

import doctest

doctest.testmod()

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