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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
ValueError(tclosed((s/sys/lib/python2.7/StringIO.pyt_complain_ifclosed&scBs�eZdZdd�Zd�Zd�Zd�Zd�Zdd�Zd	�Z	d
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    When a StringIO object is created, it can be initialized to an existing
    string by passing the string to the constructor. If no string is given,
    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
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        method is called repeatedly. This method returns the next input line,
        or raises StopIteration when EOF is hit.
        (RRtreadlinet
StopIteration(Rtr((s/sys/lib/python2.7/StringIO.pytnextDs

	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.

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        positioning); other values are 1 (seek relative to the current
        position) and 2 (seek relative to the file's end).

        There is no return value.
        RiiiN(RRRR	tjoinRR
tmax(RRtmode((s/sys/lib/python2.7/StringIO.pytseek_s	
	cCst|j�|jS(s#Return the file's current position.(RRR(R((s/sys/lib/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
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        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.
        RiN(	RRRR	RtNoneR
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		cCs�t|j�|jr=|jdj|j�7_g|_n|jjd|j�}|dkrm|j}n
|d}|dk	r�|dkr�|j||kr�|j|}q�n|j|j|!}||_|S(s%Read one entire line from the file.

        A trailing newline character is kept in the string (but may be absent
        when a file ends with an incomplete line). If the size argument is
        present and non-negative, it is a maximum byte count (including the
        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
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        Rs
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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^t|j�|sdSt|t�s5t|�}n|j}|j}||kr�|jj|�|t|�|_|_dS||kr�|jjd||�|}n|t|�}||kr2|jr�j	dj
|j�7_	n|j	| ||j	|g|_d|_	||krH|}qHn|jj|�|}||_||_dS(sGWrite a string to the file.

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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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cCst|j�dS(s"Flush the internal buffer
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        Retrieve the entire contents of the "file" at any time before
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        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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File length =isFirst line =s
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bad lengthisTruncated length =struncate did not adjust length(tsystargvtopenR+R"RR4R6R-tRuntimeErrorRRR
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