Moved _info function into docstring

[radarhere]

In selftest.py, the shell commands in the docstring refers a number of times to an earlier function, _info. This PR suggests merging that function into the docstring as a lambda instead.

This should help give users the impression that they can just be up-and-running from shell, rather than "Wait, I run these shell commands from the example... but they refer to an external function?"

I also removed the load() command from _info, as I found it wasn't necessary.

[hugovk]

I find defs clearer, and PEP 8 discourages lambdas:

Always use a def statement instead of an assignment statement that binds a lambda expression directly to an identifier:

# Correct:
def f(x): return 2*x

# Wrong:
f = lambda x: 2*x

The first form means that the name of the resulting function object is specifically 'f' instead of the generic '<lambda>'. This is more useful for tracebacks and string representations in general. The use of the assignment statement eliminates the sole benefit a lambda expression can offer over an explicit def statement (i.e. that it can be embedded inside a larger expression)