What is the process to access the contents of b-string from a file?

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Here is the process to access the contents of a b-string from a file:

1. Open the file using the open() method and specifying the file path and mode (e.g. "rb" for read binary mode).

2. Use the read() method to read the entire file contents into a variable, such as data = file.read().

3. Convert the binary data to a b-string by calling the bytes() method, such as b_string = bytes(data).

4. Close the file by calling the close() method on the file object.

Now you can access the contents of the b-string variable using standard Python string operations. For example, you can iterate over the bytes using a for loop and get the ASCII character code of each byte using the ord() function.