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File-like objects that read from or write to a string buffer.

This implements (nearly) all stdio methods.

f = StringIO()      # ready for writing
f = StringIO(buf)   # ready for reading
f.close()           # explicitly release resources held
flag = f.isatty()   # always false
pos = f.tell()      # get current position
f.seek(pos)         # set current position
f.seek(pos, mode)   # mode 0: absolute; 1: relative; 2: relative to EOF
buf = f.read()      # read until EOF
buf = f.read(n)     # read up to n bytes
buf = f.readline()  # read until end of line ('\n') or EOF
list = f.readlines()# list of f.readline() results until EOF
f.truncate([size])  # truncate file at to at most size (default: current pos)
f.write(buf)        # write at current position
f.writelines(list)  # for line in list: f.write(line)
f.getvalue()        # return whole file's contents as a string

Notes:
- Using a real file is often faster (but less convenient).
- There's also a much faster implementation in C, called cStringIO, but
  it's not subclassable.
- fileno() is left unimplemented so that code which uses it triggers
  an exception early.
- Seeking far beyond EOF and then writing will insert real null
  bytes that occupy space in the buffer.
- There's a simple test set (see end of this file).
i����(tEINVALitStringIOcCs|rtd�ndS(NsI/O operation on closed file(t
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When a StringIO object is created, it can be initialized to an existing
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    the StringIO will start empty.

The StringIO object can accept either Unicode or 8-bit strings, but
    mixing the two may take some care. If both are used, 8-bit strings that
    cannot be interpreted as 7-bit ASCII (that use the 8th bit) will cause
    a UnicodeError to be raised when getvalue() is called.
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cCs%|js!t|_|`|`ndS(s Free the memory buffer.
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icCs�t|j�|jr=|jdj|j�7_g|_n|dkrY||j7}n|dkru||j7}ntd|�|_dS(sSet the file's current position.

The mode argument is optional and defaults to 0 (absolute file
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There is no return value.
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	cCst|j�|jS(s#Return the file's current position.(RRR(R((s /usr/lib64/python2.7/StringIO.pyttellrs
i����cCs�t|j�|jr=|jdj|j�7_g|_n|dksU|dkra|j}nt|j||j�}|j|j|!}||_|S(sERead at most size bytes from the file
        (less if the read hits EOF before obtaining size bytes).

If the size argument is negative or omitted, read all data until EOF
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        string is returned when EOF is encountered immediately.
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A trailing newline character is kept in the string (but may be absent
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        trailing newline) and an incomplete line may be returned.

An empty string is returned only when EOF is encountered immediately.

Note: Unlike stdio's fgets(), the returned string contains null
        characters ('\0') if they occurred in the input.
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cCsrd}g}|j�}xS|rm|j|�|t|�7}d|koU|knr^Pn|j�}qW|S(s'Read until EOF using readline() and return a list containing the
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cCs~t|j�|dkr%|j}n9|dkrCttd��n||jkr^||_n|j�| |_||_dS(s�Truncate the file's size.

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				 		cCs(|j}x|D]}||�qWdS(sWrite a sequence of strings to the file. The sequence can be any
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File length =isFirst line =s
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more liness
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