The usage of format in Python for {0:b}

In Python, the format function is used to format strings, with {} used to specify the content to be inserted. Format specifiers can be used within {} to specify the output format.

{0:b} is a format specifier that indicates the output of the 0th argument in binary format.

Here is an example:

num = 10
print("二进制格式: {0:b}".format(num))

The output results are:

二进制格式: 1010

In the above example, {0:b} means that the first argument num will be output in binary format. Since the value of num is 10, the output will be 1010.