io.StringIO() ⚬ Entries

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io.StringIO() ⚬｜Documentation｜1st｜20260122195929-00-⌔

io — Core tools for working with streams — Python 3.14.2 documentation#io.StringIO

class io.StringIO(initial_value='', newline='\n')

A text stream using an in-memory text buffer. It inherits from TextIOBase.

The text buffer is discarded when the close() method is called.

The initial value of the buffer can be set by providing initial_value. If newline translation is enabled, newlines will be encoded as if by write(). The stream is positioned at the start of the buffer which emulates opening an existing file in a w+ mode, making it ready for an immediate write from the beginning or for a write that would overwrite the initial value. To emulate opening a file in an a+ mode ready for appending, use f.seek(0, io.SEEK_END) to reposition the stream at the end of the buffer.

The newline argument works like that of TextIOWrapper, except that when writing output to the stream, if newline is None, newlines are written as \n on all platforms.

StringIO provides this method in addition to those from TextIOBase and IOBase:

Printed 2026-06-28.

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