Provide the patch which makes the block-level tokenizer.py compatible with current python version

[Bona]

diff.txt

[Rexime]

hi, I'm learning how to use SourcererCC, and when I try to use tokenizer as written in Readme, I failed. all the output files are empty, can you help me?

[Bona]

您好，您的邮件我已收到，祝天天开心。

[crista]

Thanks. I merged it. Almost all, but not all.
c296871

[Bona]

您好，您的邮件我已收到，祝天天开心。