python 字符串中的二进制格式

Question

Is it not possible to do binary formatting in a normal python %-formatted string? For example:

>>> "Here is %b" % 4
ValueError: unsupported format character 'b' (0x62) at index 9

I know you can using f-strings / format-strings:

>>> f"Here is {4:b}"
'Here is 100'

>>> "Here is {num:b}".format(num=4)
'Here is 100'

But is there a way to do this with the %-string?

Answer 1

No you cannot do binary formatting using %b. You need to use the python bin(number) function which will return binary of that number preceeded by "0b". you could do bin(number)[2:] to slice off 0b.