If you want to read a file in Python, you can use the file_obj to open and read the file content. First, you need to open the file using the open() function, specifying the file path and the mode (e.g., 'r' for reading). Once the file is open, you can use the read() method of the file_obj to read the content into a variable. You can then process the content as needed, such as printing it or manipulating the data. Afterwards, don't forget to close the file using the close() method of the file_obj to free up system resources. In summary, reading a file_obj in Python involves opening the file, reading the content, processing it, and then closing the file to ensure proper resource management.