add parseMode in OpenFunction
remove parseMode()
always string
remove BufferedRWPair (no use)
fix typo
Merge branch 'master' into io
Merge branch 'master' into io
remove bufferdrwpair
remove ast_Print.derived
Merge branch 'master' into io
Merge branch 'master' into io
IOBase have input_stream and output_stream members.
revert
return TextIOWrapper in text mode reading
create TextIOWrapper instance by input/output stream
add readlines() method in TextIOWrapper
fix compiled