Using Random Access Input Output¶
Read a particular record from somewhere inside a large file of fixed-length records.
def seek_and_read(file_name, buf_size, byte_number): with open(file_name) as f: f.seek(byte_number) buf = f.read(buf_size) return buf def main(): buf_size = 48 byte_number = 6 print(seek_and_read( './files_random_access_input_output.py', buf_size, byte_number)) if __name__ == '__main__': main()
The file seek call, seeks to a particular position in the file. The read method then reads the block of text.