3.1.1. Binary

  • Base 2

  • Allowed: 0, 1

  • Prefix: 0b...

>>> data = 0b1000101
>>> print(data)
69

>>> int('0b1000101', base=2)
69
>>>
>>> int('1000101', base=2)
69

>>> int(1000101, base=2)
Traceback (most recent call last):
TypeError: int() can't convert non-string with explicit base
>>>
>>> bin('69')
Traceback (most recent call last):
TypeError: 'str' object cannot be interpreted as an integer

3.1.2. Octal

  • Base 8

  • Allowed: 0, 1, 2, 3, 4, 5, 6, 7

  • Prefix: 0o...

>>> data = 0o105
>>> print(data)
69

>>> int('0o105', base=8)
69
>>>
>>> int('105', base=8)
69

>>> int(0o105, base=8)
Traceback (most recent call last):
TypeError: int() can't convert non-string with explicit base
>>>
>>> int(105, base=8)
Traceback (most recent call last):
TypeError: int() can't convert non-string with explicit base

3.1.3. Decimal

  • Base 10

  • Allowed: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

>>> data = 69
>>> print(data)
69

>>> int('69', base=10)
69

>>> int(69, base=10)
Traceback (most recent call last):
TypeError: int() can't convert non-string with explicit base

3.1.4. Hexadecimal

  • Base 16

  • Allowed: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, A, B, C, D, E, F

  • Prefix: 0x...

>>> data = 0x45
>>> print(data)
69

>>> int('45', base=16)
69
>>>
>>> int('0x45', base=16)
69

Other examples:

>>> int('100', base=16)
256
>>>
>>> int('0x69', base=16)
105
>>>
>>> int('0x3C', base=16)
60

3.1.5. Errors

>>> data = 'abc'
>>>
>>> int(data, base=10)
Traceback (most recent call last):
ValueError: invalid literal for int() with base 10: 'abc'
>>>
>>>
>>> int(data, base=16)
2748
>>>
>>> import string
>>> string.hexdigits
'0123456789abcdefABCDEF'

3.1.6. Assignments