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BufferedWriter(raw [, buffer_size [, max_buffer_size]])
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A class for buffered binary writing on a raw file specified in raw buffer_size specifies the number of bytes that can be saved in the buffer before data is flushed to the underlying I/O streamThe default value is DEFAULT_BUFFER_SIZE max_buffer_size specifies the maximum buffer size to use for storing output data that is being written to a non-blocking stream and defaults to twice the value of buffer_sizeThis value is larger to allow for continued writing while the previous buffer contents are written to the I/O stream by the operating system An instance f of BufferedWriter supports the following operations:
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Writes all bytes stored in the buffer to the underlying I/O stream Raises a BlockingIOError exception if the file is in nonblocking mode and the operation would block (eg, if the stream can t accept any new data at the moment) Writes the bytes in bytes to the I/O stream and returns the number of bytes actually written If the underlying stream is nonblocking, a BlockingIOError exception is raised if write operation would block
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A class for buffered binary reading and writing on a pair of raw I/O streams reader is a raw file that supports reading, and writing is a raw file that supports writingThese files may be different, which may be useful for certain kinds of communication involving pipes and socketsThe buffer size parameters have the same meaning as for BufferedWriter An instance f of BufferedRWPair supports all of the operations for BufferedReader and BufferedWriter
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A class for buffered binary reading and writing on a raw I/O stream that supports random access (eg, seeking) raw must be a raw file that supports both read, write, and seek operationsThe buffer size parameters have the same meaning as for BufferedWriter An instance f of BufferedRandom supports all of the operations for BufferedReader and BufferedWriter
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BytesIO([bytes])
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An in-memory file that implements the functionality of a buffered I/O stream bytes is a byte string that specifies the initial contents of the file An instance b of BytesIO supports all of the operations of BufferedReader and BufferedWriter objects In addition, a method bgetvalue() can be used to return the current contents of the file as a byte string As with FileIO objects, all the file objects in this section should not be used with line-oriented data such as text Although it s not quite as bad due to buffering, the resulting performance is still quite poor (eg, more than 50 times slower than reading lines with files created using the Python 26 built-in open() function) Also, because of internal buffering, you need to take care to manage flush() operations when writing For example, if you use fseek() to move the file pointer to a new location, you should first use fflush() to flush any previously written data (if any)
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Also, be aware that the buffer size parameters only specify a limit at which writes occur and do not necessarily set a limit on internal resource use For example, when you do a fwrite(data) on a buffered file f, all of the bytes in data are first copied into the internal buffers If data represents a very large byte array, this copying will substantially increase the memory use of your programThus, it is better to write large amounts of data in reasonably sized chunks, not all at once with a single write() operation It should be noted that because the io module is relatively new, this behavior might be different in future versions
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The text I/O layer is used to process line-oriented character dataThe classes defined in this section build upon buffered I/O streams and add line-oriented processing as well as Unicode character encoding and decoding All of the classes here inherit from TextIOBase
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A class for a buffered text stream buffered is a buffered I/O as described in the previous section encoding is a string such as 'ascii' or 'utf-8' that specifies the text encoding errors specifies the Unicode error-handling policy and is 'strict' by default (see 9, Input and Output, for a description) newline is the character sequence representing a newline and may be None, '', '\n', '\r', or '\r\n' If None is given, then universal newline mode is enabled in which any of the other line endings are translated into '\n' when reading and oslinesep is used as the newline on output If newline is one of the other values, then all '\n' characters are translated into the specified newline on output line_buffering is a flag that controls whether or not a flush() operation is performed when any write operation contains the newline character By default, this is False An instance f of TextIOWrapper supports all of the operations defined on IOBase as well as the following: