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def process_chunk(chunk)
    process_chunk.buffer += chunk
    lines = process_chunk.buffer.split("\r\n")
    if process_chunk.buffer[-2:] != "\r\n":
        process_chunk.buffer = lines.pop()
    else:
        process_chunk.buffer = ""
    return lines
process_chunk.buffer = ""
 
chunks = (
    "wellformed 1 \r\n",
    "wellformed 2 \r\n",
    "incomplete 1 ",
    "incomplete 2 ",
    "wellformed 3 \r\nwellformed 4 \r\nincomplete 3",
    "wellformed 5 \r\nwellformed 6 \r\n",
)
 
def main():
    lines = ()
    for chunk in chunks:
        lines += process_chunk(chunk)
    print(lines)
 
main()

Traceback (most recent call last):
  File "/usr/lib/python3.5/py_compile.py", line 125, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 735, in source_to_code
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "./prog.py", line 1
    def process_chunk(chunk)
                           ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/py_compile.py", line 129, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 1
    def process_chunk(chunk)
                           ^
SyntaxError: invalid syntax

Standard output is empty