The Python Language

A Python program is composed of a sequence of logical lines, each made up of one or more physical lines. Each physical line may end with a comment. A hash sign (#) that is not inside a string literal begins a comment. All characters after the # and up to the physical line end are part of the comment, and the Python interpreter ignores them. A line containing only whitespace, possibly with a comment, is known as a blank line, and Python totally ignores it. In an interactive interpreter session, you must enter an empty physical line (without any whitespace or comment) to terminate a multiline statement.
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