Difference between a text file in r and rb mode
what’s the Difference between r and rb in fopen
0. EOL (end-of-line)
The difference is mainly in the treatment of EOL. For different operating systems,
Unix: \nMac: \rWindows: \r\n
For the Python language, the query is performed using the following statement:

>> import os
>> os.linesep
'\r\n'

1. Different operating systems
For Windows systems, having b (rb, wb, r+b) means to open files in binary form. Python on Windows handles text files differently than binary files,
2. Python 2 vs Python 3
For Python 3 environments:
r : Python returns STR rb : binary mode, read() returns 0 bytes1