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(python2.1-ref.info)Explicit line joining

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Explicit line joining
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Two or more physical lines may be joined into logical lines using
backslash characters (`\'), as follows: when a physical line ends in a
backslash that is not part of a string literal or comment, it is joined
with the following forming a single logical line, deleting the
backslash and the following end-of-line character.  For example:
     if 1900 < year < 2100 and 1 <= month <= 12 \
        and 1 <= day <= 31 and 0 <= hour < 24 \
        and 0 <= minute < 60 and 0 <= second < 60:   # Looks like a valid date
             return 1

A line ending in a backslash cannot carry a comment.  A backslash does
not continue a comment.  A backslash does not continue a token except
for string literals (i.e., tokens other than string literals cannot be
split across physical lines using a backslash).  A backslash is illegal
elsewhere on a line outside a string literal.