Python provides base conversion functions to convert an integer number to another base. **Whenever you print a binary, octal or a hexadecimal integer number, it is printed by default in decimal form**. But sometimes there is a need to change base of an integer, for example, decimal form to binary form.

**Please note that all binary, octal and hexadecimal representation can not be used for fractional numbers, for example, 1.33**.

Following are the base conversion functions:

bin() | Convert an integer number to a binary string prefixed with “0b” |

oct() | Convert an integer number to an octal string prefixed with “0o” |

hex() | Convert an integer number to a lowercase hexadecimal string prefixed with “0x” |

In the following program we’ll convert decimal, binary, octal and hexadecimal integer numbers in other base.

decimalNumber = 123 binaryNumber = 0b101 hexNumber = 0x111 octNumber = 0o111 #convert decimal number to other base print('Binary representation of decimalNumber is ', bin(decimalNumber)) print('Hexadecimal representation of decimalNumber is ', hex(decimalNumber)) print('Octal representation of decimalNumber is ', oct(decimalNumber)) #to print empty line in console print() #convert binary number to other base print('Decimal representation of binaryNumber is ', int(binaryNumber)) print('Hexadecimal representation of binaryNumber is ', hex(binaryNumber)) print('Octal representation of binaryNumber is ', oct(binaryNumber)) #to print empty line in console print() #convert hexadecimal number to other base print('Decimal representation of hexNumber is ', int(hexNumber)) print('Hexadecimal representation of hexNumber is ', bin(hexNumber)) print('Octal representation of hexNumber is ', oct(hexNumber)) #to print empty line in console print() #convert octal number to other base print('Decimal representation of octNumber is ', int(octNumber)) print('Binary representation of octNumber is ', bin(octNumber)) print('Hexadecimal representation of octNumber is ', hex(octNumber))

Output

```
Binary representation of decimalNumber is 0b1111011
Hexadecimal representation of decimalNumber is 0x7b
Octal representation of decimalNumber is 0o173
Decimal representation of binaryNumber is 5
Hexadecimal representation of binaryNumber is 0x5
Octal representation of binaryNumber is 0o5
Decimal representation of hexNumber is 273
Hexadecimal representation of hexNumber is 0b100010001
Octal representation of hexNumber is 0o421
Decimal representation of octNumber is 73
Binary representation of octNumber is 0b1001001
Hexadecimal representation of octNumber is 0x49
```