StringIO | |||
# class StringIO implements file-like objects that read/write a
# string buffer (a.k.a. "memory files").
#
# 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.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).
# - 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).
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