Triple-quoted strings hath not the Python-nature

[Lawrence D'Oliveiro]

If triple-quoted strings had the Python-nature, then they would take
indentation into account. Thus:

    """this
     is a
     multi-line
    string."""

would be equivalent to

    "this\n is a\n multi-line\nstring."

and not

    "this\n     is a\n     multi-line\n    string."

The rule would be: the exact same whitespace characters at the beginning of
the line on which the triple-quoted string starts must also occur at the
start of the lines on which the string continues; these are stripped off
and not included in the string contents. Any additional whitespace is of
course part of the string.