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:
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 6.6) on a line by itself. (Expression statements
None are not written, so that procedure calls do not
cause any output.)
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