What does the “0b” mean at the begining of the byte 0b1100010?

问题

As part of a small python project I'm working on, I needed to convert text to a binary string. To accomplish this I used

list(map(bin,bytearray(message,'utf8')))

The result was 0b1100010 and I get the 1100010 part, but what does the 0b part mean?

回答1:

This is how Python tells you what base the number is:

Base 2 looks like this:

0b111010

Base 16 looks like this:

0x...

Base 8 looks like this:

0...

and etc.

Hope it helps!

回答2:

0b is the Python prefix for the representation of binary numbers.

For example:

>>> bin(1024)  # Convert an integer number to a binary string
'0b10000000000'

回答3:

The "0b" is a prefix to denote that the number is in binary. A similar thing is done in hexadecimal where numbers start with "0x".

来源：https://stackoverflow.com/questions/46002161/what-does-the-0b-mean-at-the-begining-of-the-byte-0b1100010