The examples given in this blog, input and output are
distinguished by the presence or absence of prompts (>>> and ...) : to repeat the
example, you must type everything after the prompt, when the prompt appears;
lines that do not begin with a prompt are output from the interpreter. Note
that a secondary prompt on a line by itself in an example means you must type a
blank line; this is used to end a multi-line command.
Comments in Python start with the hash character (#) and extend to the end of the physical line. A comment may appear at the start
of a line or following white-space or code, but not within a string literal. A
hash character within a string literal is just a hash character. Since comments
are to clarify code and are not interpreted by Python, they may be omitted when
typing in examples.
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