How come a returned string can be interpreted as a function in python?

What you see is the result of the getattr() builtin. Python is a high level language and what's more, an interpreted one. Since all objects in python are basically constructed in memory in forms of hash-tables Python has a rather vast Reflection mechanism.

The trick is the getattr function. It gets an attribute from an object, given its name. The name is a string.

The names of the methods (bound functions) are passed as the next variable, getattr gets the method, and the next line calls it, changing the next variable. It's basically a state machine.

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