8 kinds of connection string Python

Based on this article Python3.6 version.

1. A plus sign (str1 + str2), str result type.
   
2. Comma connection (str1, str2), the result is tuple type.
   
3. Formatting (%), as a result of type str.
   
4. Format (format), the result is the type str.
   
5. No spaces (spaces) is automatically connected, as a result of type str.
   
   NOTE: The parameter can not replace a particular string, as follows:
   
6. Backslash multi-line connection (\), the result is str type.
   
7. Multiplication connector (*), the result is the type str.
   
8. join connection (join connect list / tuple type), the result is the type str.
   
9. List comprehension, results str type.