You can use the seek(offset[, whence]) method. It sets the file's current position, like stdio's fseek(). The whence argument is optional and defaults to 0 (absolute file positioning); other values are 1 (seek relative to the current position) and 2 (seek relative to the file's end).
For example, if you already have a file open and want to go back to starting position, you can use:
f = open('my_file.txt', 'r') f.seek(0) f.close()
This will seek the pointer to beginning of the file. You can also provide the second argument as 2 and get the pointer to end of file.