Showing content from http://mail.python.org/pipermail/python-dev/attachments/20160609/67823727/attachment.py below:
def ns_read_size(input): size = '' while 1: c = input.read(1) if c == ':': break elif not c: raise IOError('short netstring read') size += c return int(size) def ns_write_string(s, output): output.write('%d:' % len(s)) output.write(s) output.write(',') def ns_read_string(input): size = ns_read_size(input) data = '' while size > 0: s = input.read(size) if not s: raise IOError('short netstring read') data = data + s size -= len(s) if input.read(1) != ',': raise IOError('missing netstring terminator') return data def compare(a, b): if a > 0: return b + 10 return 0 def main(): import tempfile out = tempfile.TemporaryFile() ns_write_string('Hello world', out) out.seek(0) s = ns_read_string(out) if s != 'Hello world': print('Failed') else: print('Ok') if (compare(None, 5) == 0 and compare(1, 5) == 15): print('Ok') else: print('Failed') if __name__ == '__main__': main()
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