Python Socket Send Buffer Vs. Str?

It seems you try to use Python 2. X examples in Python 3 and you hit one of the main differences between those Python version.

To add to Jacek Konieczny's answer: You can also use str.encode() to get bytes from a string. If you have the string in a variable instead of a literal, you can call encode and it will return an equivalent series of bytes.

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