pyarrow.BufferOutputStream

class pyarrow.BufferOutputStream

Bases: pyarrow.lib.NativeFile

__init__()

Initialize self. See help(type(self)) for accurate signature.

Methods

close(self)
download(self, stream_or_path[, buffer_size])	Read file completely to local path (rather than reading completely into memory).
fileno(self)	NOT IMPLEMENTED
flush(self)	Flush the buffer stream, if applicable.
getvalue(self)	Finalize output stream and return result as pyarrow.Buffer.
isatty(self)
read(self[, nbytes])	Read indicated number of bytes from file, or read all remaining bytes if no argument passed
read1(self[, nbytes])	Read and return up to n bytes.
read_buffer(self[, nbytes])
readable(self)
readall(self)
readinto(self, b)	Read into the supplied buffer
readline(self[, size])	NOT IMPLEMENTED.
readlines(self[, hint])	NOT IMPLEMENTED.
seek(self, int64_t position, int whence=0)	Change current file stream position
seekable(self)
size(self)	Return file size
tell(self)	Return current stream position
truncate(self)	NOT IMPLEMENTED
upload(self, stream[, buffer_size])	Pipe file-like object to file
writable(self)
write(self, data)	Write byte from any object implementing buffer protocol (bytes, bytearray, ndarray, pyarrow.Buffer)
writelines(self, lines)

Attributes

closed
mode	binary read * wb: binary write * rb+: binary read and write

close(self)

closed

download(self, stream_or_path, buffer_size=None)

Read file completely to local path (rather than reading completely into memory). First seeks to the beginning of the file.

fileno(self)

NOT IMPLEMENTED

flush(self)

Flush the buffer stream, if applicable.

No-op to match the IOBase interface.

getvalue(self)

Finalize output stream and return result as pyarrow.Buffer.

Returns:value (Buffer)

isatty(self)

mode

binary read * wb: binary write * rb+: binary read and write

Type:

The file mode. Currently instances of NativeFile may support

Type:

• rb

read(self, nbytes=None)

Read indicated number of bytes from file, or read all remaining bytes if no argument passed

Parameters:nbytes (int, default None) – Returns:data (bytes)

read1(self, nbytes=None)

Read and return up to n bytes.

Alias for read, needed to match the IOBase interface.

read_buffer(self, nbytes=None)

readable(self)

readall(self)

readinto(self, b)

Read into the supplied buffer

Parameters:b (any python object supporting buffer interface) – Returns:number of bytes written

readline(self, size=None)

NOT IMPLEMENTED. Read and return a line of bytes from the file.

If size is specified, read at most size bytes.

Line terminator is always b”n”.

readlines(self, hint=None)

NOT IMPLEMENTED. Read lines of the file

Parameters:hint (int maximum number of bytes read until we stop) –

seek(self, int64_t position, int whence=0)

Change current file stream position

Parameters:

• position (int) – Byte offset, interpreted relative to value of whence argument
• whence (int, default 0) – Point of reference for seek offset

Notes

Values of whence: * 0 – start of stream (the default); offset should be zero or positive * 1 – current stream position; offset may be negative * 2 – end of stream; offset is usually negative

Returns:new_position (the new absolute stream position)

seekable(self)

size(self)

Return file size

tell(self)

Return current stream position

truncate(self)

NOT IMPLEMENTED

upload(self, stream, buffer_size=None)

Pipe file-like object to file

writable(self)

write(self, data)

Write byte from any object implementing buffer protocol (bytes, bytearray, ndarray, pyarrow.Buffer)

Parameters:data (bytes-like object or exporter of buffer protocol) – Returns:nbytes (number of bytes written)

writelines(self, lines)