基本的Python-变量

Question

A client asked me if I could make a system around his python application. The problem is that the name of the mysql tables are variables, for example in PHP I would do this:

    <?php
    $type = "facebook";
    mysql_query("SELECT uid FROM users_".$type." WHERE username='foo'");
    ?>

Now I am trying to achieve the same thing in python, I have this block of code:

    self.exeute(
        """
        SELECT uid FROM `users_FACEBOOK` WHERE `username` = 'foo'
        """
    )

How can I replace "FACEBOOK" by a variable? (it must be fetched using the getattr-function. I have tried

    users_%(getattr(settings, 'TYPE'))
    'users_'+str(getattr(settings, 'TYPE'))

Both give errors..

Answer 1

FACEBOOK = <get the value>
self.execute('select uid from `users_%s` where `username`="foo"' %(FACEBOOK))

Answer 2

Suppose you have:

TYPE = 'FACEBOOK'

This will give you the string with the variable name:

varName = 'user_' + TYPE

and this the value in the variable:

locals()[varName]

Take a look at the help of locals.

locals(...) locals() -> dictionary

Update and return a dictionary containing the current scope's local variables.