io.TextIOBase.seek()

seek(offset[, whence])

Change the stream position to the given offset. Behaviour depends on the whence parameter. The default value for whence is SEEK_SET.

• SEEK_SET or 0: seek from the start of the stream (the default); offset must either be a number returned by TextIOBase.tell(), or zero. Any other offset value produces undefined behaviour.
• SEEK_CUR or 1: “seek” to the current position; offset must be zero, which is a no-operation (all other values are unsupported).
• SEEK_END or 2: seek to the end of the stream; offset must be zero (all other values are unsupported).

Return the new absolute position as an opaque number.