Binary, octal, hexadecimal

Number to string ：bin()、oct()、hex()

>>> bin(15)			# Binary system 
'0b1111'
>>> oct(15)			# octal 
'0o17'
>>> hex(15)			# Hexadecimal 
'0xf'

String to number ：int()

>>> int('0b1111',2)		    # Binary system 
15
>>> int('0o17',8)			# octal 
15
>>> int('0xf',16)			# Hexadecimal 
15

Format display

>>> "{0:#x}".format(0xf)		# Lowercase letters , Hexadecimal number 
'0xf'
>>> "{0:#X}".format(0xf)		# Capital 
'0XF'
>>> "{0:#x}".format(15)			# Lowercase letters , Decimal number 
'0xf'
>>> "{0:x}".format(15)			# Lowercase letters , Decimal number , Without prefix 0x
'f'
>>> "{0:0>8x}".format(255)		# Occupy 8 Bit character , Align left , repair 0
'000000ff'