Creating a single item ENUM result incorrect

Creating an enum using a Python tuple could result in the following:
`python
my_enum = ("FIRST")
`

This results in a column in the database (at least for MySQL) with the following:
`mysql
column enum('F','I','R','S','T') DEFAULT NULL,
`
Which is of course not what was meant. The generated tuple should have the following format to fix this:
`python
my_enum = ("FIRST",)
`
