Creating Top-Level names root0, root1, root2... rootN Setting the stage: We've come across an ethnicity, in our voyages of the starship whatever, that doesn't share our fascination with squares and cubes. For example, when multiplying n * n, it never occurred to them to picture n * n squares in a checkerboard pattern. Rather, they have a more Chinese Checkers bias towards triangles and hexagons, and their picture of n * n is an equilateral triangle subdivided into n ** 2 similar sub-triangles. Likewise, their picture of n * n * n, or n**3 is a tetrahedron, though here the subdividing process results in a matrix known to Earthlings ("terra-ists") as the FCC and/or CCP and/or... whatever Earthling terminology. The Challenge: The anthropologist-astronauts we've left behind to work and study with these people (to be collected on a next pass a year from now, unless they plan on staying longer), are using Python, and find that saying 'sqrt' just gets in the way (keeps them habituated to patterns of thought they're trying to snap out of). What they'd like to do is this: for 2nd, 3rd, 4th, 5th etc. root of a number, have the functions root2, root3, root4... up to root10 routinely available, perhaps in a module called roots or radicals.

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import radicals as r r.root3 ( 2.0 / 3.0 ) 0.8735804647362989

So how might we generate root0... root10 in a factory function, such that these function names become top level within their generating and/or defining module? True, we could individually define these functions per the example below, but what is a clever way of generating rootN in principle, such as root2012, taking 2012 as an argument. Hints: For root2, you might take an obvious shortcut: from math import sqrt as root2 For root3, consider the following: def root3 (x): return pow( x, 1.0/3.0 ) In general: def rootN (x): return pow( x, 1.0/N) Rationale for this exercise: Students often want a way to factory-produce new names at the top level, from within a contained scope (such as from within a function). These top level names may be of data, functions or whatever arbitrary objects. The production process often involves synthesizing new names on the fly, as strings. Strings are "right side" objects, usually assigned names, but not themselves names of anything. By what magic might we turn a string object into a top-level name: that is the question this lesson addresses.