Python stream file object

The latter accepts both, str instances and unicode instances. Sven Great that does it. Post it as an answer and you will receive 15 points!!! The proper fix for this is to write unicode strings.

You can convert from one to the other using encode and decode. StringIO , so simply accept that one. Add a comment. Active Oldest Votes. As the documentation of io states: Since this module has been designed primarily for Python 3.

Improve this answer. Saw this myself when testing. Edited with a wholly different suggestion inspired by a comment. Sign up or log in Sign up using Google. Sign up using Facebook.

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This process is called compilation. All of the object files used in a program must be combined before the program can be run. This is done using a linker tool, which takes one or more objects and Some buffers, like BytesIO , do not have the concept of a single raw stream to return from this method.

They raise UnsupportedOperation. Read and return up to size bytes. If the argument is omitted, None , or negative, data is read and returned until EOF is reached. An empty bytes object is returned if the stream is already at EOF. If the argument is positive, and the underlying raw stream is not interactive, multiple raw reads may be issued to satisfy the byte count unless EOF is reached first. But for interactive raw streams, at most one raw read will be issued, and a short result does not imply that EOF is imminent.

A BlockingIOError is raised if the underlying raw stream is in non blocking-mode, and has no data available at the moment. This can be useful if you are implementing your own buffering on top of a BufferedIOBase object. If size is -1 the default , an arbitrary number of bytes are returned more than zero unless EOF is reached.

Read bytes into a pre-allocated, writable bytes-like object b and return the number of bytes read. Like read , multiple reads may be issued to the underlying raw stream, unless the latter is interactive. Return the number of bytes read. Write the given bytes-like object , b , and return the number of bytes written always equal to the length of b in bytes, since if the write fails an OSError will be raised. Depending on the actual implementation, these bytes may be readily written to the underlying stream, or held in a buffer for performance and latency reasons.

A raw binary stream representing an OS-level file containing bytes data. It inherits RawIOBase. In this case closefd must be True the default otherwise an error will be raised. When the FileIO object is closed this fd will be closed as well, unless closefd is set to False.

The mode can be 'r' , 'w' , 'x' or 'a' for reading default , writing, exclusive creation or appending. FileExistsError will be raised if it already exists when opened for creating.

Opening a file for creating implies writing, so this mode behaves in a similar way to 'w'. The read when called with a positive argument , readinto and write methods on this class will only make one system call. A custom opener can be used by passing a callable as opener. The underlying file descriptor for the file object is then obtained by calling opener with name , flags. The newly created file is non-inheritable.

See the open built-in function for examples on using the opener parameter. The 'x' mode was added. The file name. This is the file descriptor of the file when no name is given in the constructor.

A binary stream using an in-memory bytes buffer. It inherits BufferedIOBase. The buffer is discarded when the close method is called. Return a readable and writable view over the contents of the buffer without copying them. Also, mutating the view will transparently update the contents of the buffer:.

As long as the view exists, the BytesIO object cannot be resized or closed. Return bytes containing the entire contents of the buffer. In BytesIO , this is the same as read.

In BytesIO , this is the same as readinto. A buffered binary stream providing higher-level access to a readable, non seekable RawIOBase raw binary stream. When reading data from this object, a larger amount of data may be requested from the underlying raw stream, and kept in an internal buffer.

The buffered data can then be returned directly on subsequent reads. Return bytes from the stream without advancing the position. At most one single read on the raw stream is done to satisfy the call. The number of bytes returned may be less or more than requested. Read and return size bytes, or if size is not given or negative, until EOF or if the read call would block in non-blocking mode. Read and return up to size bytes with only one call on the raw stream.

If at least one byte is buffered, only buffered bytes are returned. Otherwise, one raw stream read call is made. A buffered binary stream providing higher-level access to a writeable, non seekable RawIOBase raw binary stream. When writing to this object, data is normally placed into an internal buffer. The buffer will be written out to the underlying RawIOBase object under various conditions, including:.

The constructor creates a BufferedWriter for the given writeable raw stream. Force bytes held in the buffer into the raw stream. A BlockingIOError should be raised if the raw stream blocks. Write the bytes-like object , b , and return the number of bytes written. When in non-blocking mode, a BlockingIOError is raised if the buffer needs to be written out but the raw stream blocks. A buffered binary stream providing higher-level access to a seekable RawIOBase raw binary stream.

It inherits BufferedReader and BufferedWriter. The constructor creates a reader and writer for a seekable raw stream, given in the first argument. In addition, seek and tell are guaranteed to be implemented. A buffered binary stream providing higher-level access to two non seekable RawIOBase raw binary streams—one readable, the other writeable.

BufferedRWPair does not attempt to synchronize accesses to its underlying raw streams. You should not pass it the same object as reader and writer; use BufferedRandom instead. Base class for text streams. A string, a tuple of strings, or None , indicating the newlines translated so far.

Depending on the implementation and the initial constructor flags, this may not be available. Separate the underlying binary buffer from the TextIOBase and return it. After the underlying buffer has been detached, the TextIOBase is in an unusable state.

Read and return at most size characters from the stream as a single str. If size is negative or None , reads until EOF. Read until newline or EOF and return a single str. If the stream is already at EOF, an empty string is returned. Change the stream position to the given offset. Behaviour depends on the whence parameter. Any other offset value produces undefined behaviour.

Return the current stream position as an opaque number. The number does not usually represent a number of bytes in the underlying binary storage. A buffered text stream providing higher-level access to a BufferedIOBase buffered binary stream.