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(python2.1-ref.info)Expression statements

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Expression statements
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Expression statements are used (mostly interactively) to compute and
write a value, or (usually) to call a procedure (a function that
returns no meaningful result; in Python, procedures return the value
`None').  Other uses of expression statements are allowed and
occasionally useful.  The syntax for an expression statement is:

     expression_stmt: expression_list

An expression statement evaluates the expression list (which may be a
single expression).

In interactive mode, if the value is not `None', it is converted to a
string using the built-in `repr()' function and the resulting string is
written to standard output (see section Note: print statement) on a
line by itself.  (Expression statements yielding None are not written,
so that procedure calls do not cause any output.)