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function Readable.read 
def Readable.read(
size: int = …,
/
) -> bytes
Reads bytes from this source. If size is provided, reads up to that many bytes. If size is not provided, reads until EOF. Returns the bytes read. function Readable.read_to_string 
def Readable.read_to_string() -> str
Reads all bytes until EOF in this source and returns a string. If successful, this function will return all bytes as a string. property Readable.is_tty 
Readable.is_tty: bool
Returns true if the underlying stream is connected to a terminal/tty.